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• VRF Internet Gateway Multiple External IP's 1 Internal IP to AWS

  - by user223903

  Trying to setup VRF for the first time and its not working for me even though I keep reading everything online. IP's are different to real life. I have an Internet connection which I can ping to my router in the current setup below 195.45.73.22 I have a block of ip addresses 195.45.121.0/27 I want to setup multiple VPN's to AWS so need to have multiple external ip's thus the block of IP addresses. I have setup the 2nd and 3rd IP address but can not ping them from external. Any help would be grateful. Bryan ip source-route ! ip vrf Internet rd 1:1 route-target export 1:1 route-target import 1:1 ip vrf AWSSydney1 rd 2:2 route-target export 2:2 route-target import 2:2 route-target import 1:1 ip vrf AWSSydney2 rd 3:3 route-target export 3:3 route-target import 3:3 route-target import 1:1 ip cef no ip domain lookup no ipv6 cef multilink bundle-name authenticated interface FastEthernet0/0 description Vocus Internet no ip address speed 100 full-duplex interface FastEthernet0/0.1 encapsulation dot1Q 1 native ip address 195.45.73.22 255.255.255.252 interface FastEthernet0/0.2 encapsulation dot1Q 2 ip vrf forwarding AWSSydney1 ip address 195.45.121.1 255.255.255.224 interface FastEthernet0/0.3 encapsulation dot1Q 3 ip vrf forwarding AWSSydney2 ip address 195.45.121.2 255.255.255.224 interface FastEthernet0/1 description LAN_SIDE ip address 10.0.0.5 255.255.255.0 speed 100 full-duplex no mop enabled ip forward-protocol nd ip route 0.0.0.0 0.0.0.0 195.45.73.21 ip route vrf Internet 0.0.0.0 0.0.0.0 195.45.73.21

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• Bash Script - Traffic Shaping

  - by Craig-Aaron

  hey all, I was wondering if you could have a look at my script and help me add a few things to it, How do I get it to find how many active ethernet ports I have? and how do I filter more than 1 ethernet port How I get this to do a range of IP address? Once I have a few ethenet ports I need to add traffic control to each one #!/bin/bash # Name of the traffic control command. TC=/sbin/tc # The network interface we're planning on limiting bandwidth. IF=eth0 # Network card interface # Download limit (in mega bits) DNLD=10mbit # DOWNLOAD Limit # Upload limit (in mega bits) UPLD=1mbit # UPLOAD Limit # IP address range of the machine we are controlling IP=192.168.0.1 # Host IP # Filter options for limiting the intended interface. U32="$TC filter add dev $IF protocol ip parent 1:0 prio 1 u32" start() { # Hierarchical Token Bucket (HTB) to shape bandwidth $TC qdisc add dev $IF root handle 1: htb default 30 #Creates the root schedlar $TC class add dev $IF parent 1: classid 1:1 htb rate $DNLD #Creates a child schedlar to shape download $TC class add dev $IF parent 1: classid 1:2 htb rate $UPLD #Creates a child schedlar to shape upload $U32 match ip dst $IP/24 flowid 1:1 #Filter to match the interface, limit download speed $U32 match ip src $IP/24 flowid 1:2 #Filter to match the interface, limit upload speed } stop() { # Stop the bandwidth shaping. $TC qdisc del dev $IF root } restart() { # Self-explanatory. stop sleep 1 start } show() { # Display status of traffic control status. $TC -s qdisc ls dev $IF } case "$1" in start) echo -n "Starting bandwidth shaping: " start echo "done" ;; stop) echo -n "Stopping bandwidth shaping: " stop echo "done" ;; restart) echo -n "Restarting bandwidth shaping: " restart echo "done" ;; show) echo "Bandwidth shaping status for $IF:" show echo "" ;; *) pwd=$(pwd) echo "Usage: tc.bash {start|stop|restart|show}" ;; esac exit 0 thanks

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• Kernel panic while loading Mac OS X on VMWare

  - by Vladimir Gritsenko

  I'm trying to run Mac OS X 10.6.3 on VMWare 7.1 from within Windows 7 64 bit. Trying to run the OS X doesn't work - shortly after booting VMWare announces the machine's death with this pop-up message: The CPU has been disabled by the guest operating system. You will need to power off or reset the virtual machine at this point. The console has a more interesting announcement: The real-time clock was not properly initialized on your system! With a dump of the detected CPU speed (~2.9 GHz), FSB (~94 MHz) and bus ratio (31). Somehow, the code that panics is documented in an accidental .diff file here. Apparently, it commits seppuku if the bus ratio is greater than 30. I underclocked my E6500 to a slower speed, but this apparently didn't make any difference. I can think of two possibilities right now: The CPU info being read is constant, and defines the maximum ability of the CPU. In which case it appears I'm screwed. VMWare presents its own CPU info to the machine, which I can perhaps somehow change. If so, how? If these sound completely off, that's because I'm a real newbie in these matters. Here's hoping you guys can show me the light :-)

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• Strange performance differences in read/write from/to USB flash drive

  - by Mario De Schaepmeester

  When copying files from my 8GB USB 2.0 flash drive with Windows 7 to a traditional hard drive, the average speed is between 25 and 30 MB/s. When doing the reverse, copying to the USB drive, the speed is 5MB/s average. I have tested this with about 4.5GB of files, a mixture of smaller and larger ones. The observations were the same on both FAT32 and exFAT file systems on the USB drive, NTFS on the internal hard disk. I don't think I can be mistaken in saying that flash memory has a lot higher performance than a spinning hard drive in both terms of reading and writing. For both memory types, reading should be faster than writing too. Now I wonder, how can it be that copying files from a fast read memory to a faster write memory is actually slower than copying files from a fast read memory to a slow write memory? I think that the files are stored in RAM before being copied over too, and there's caching as well, but I don't see how even that could tip the balance. It can only be in the advantage of writing to the USB drive, since it is "closer" to the SATA system than the USB port and it will receive data from the internal SATA HDD faster. Perhaps my way of thinking is all wrong or it just depends on the manufacturer of the USB pen. But I am curious.

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• nVidia performance with newer X and newer driver abysmal with Compiz

  - by Nakedible

  I recently upgraded Debian to Xorg 2.9.4 and installed nvidia-glx from experimental, version 260.19.21. This was somewhat of an uphill battle as the dependencies for the experimental nvidia-glx package are still somewhat broken. I got it to work without forcing the installation of any packages and without modifying the packages. However, after the upgrade compiz performance has been abysmal. I am using the desktop wall plugin and switching viewports is really slow - takes a few seconds for each switch. In addition to this, every effect that compiz does, such as zoom animations for icons when launching applications, takes seconds. The viewport switching speed changes relative to the amount of windows on that virtual screen - empty screens switch almost at normal speed, single browser windows work almost decently, but just 4 rxvt terminals slows the switches down to a crawl. My compiz configuration should be pretty basic. Xorg is likewise configured without anything special - the only "custom" configuration is forcing the driver name to be "nvidia". I've fiddled around with the nvidia-settings and compizconfig trying different VSync settings, but none of those helped. My graphics card is: NVIDIA GPU NVS 3100M (GT218) at PCI:1:0:0 (GPU-0). This is laptop GPU that is from the Geforce GTX 200 series. Graphics card performance should naturally be no problem.

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• XAMPP CURL not working!

  - by MiffTheFox

  Nope, it's not. Windows Vista Home Premium x32: Relevant section of php.ini: ; Windows Extensions ; Note that ODBC support is built in, so no dll is needed for it. ; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5) ; extension folders as well as the separate PECL DLL download (PHP 5). ; Be sure to appropriately set the extension_dir directive. ;extension=php_apc.dll ;extension=php_apd.dll ;extension=php_bcompiler.dll ;extension=php_bitset.dll ;extension=php_blenc.dll ;extension=php_bz2.dll ;extension=php_bz2_filter.dll ;extension=php_classkit.dll ;extension=php_cpdf.dll ;extension=php_crack.dll extension=php_curl.dll ;extension=php_cvsclient.dll ;extension=php_db.dll ;extension=php_dba.dll ;extension=php_dbase.dll ;extension=php_dbx.dll Proof it's not working: c:\users\miff>curl http://localhost/xampp/phpinfo.php | grep curl % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 62592 0 62592 0 0 1971k 0 --:--:-- --:--:-- --:--:-- 3319k <tr><td class="e">HTTP_USER_AGENT </td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS </td></tr> <tr><td class="e">User-Agent </td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS </td></tr> <tr><td class="e">_SERVER["HTTP_USER_AGENT"]</td><td class="v">curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8k zlib/1.2.3 libssh2/0.15-CVS</td></tr> c:\users\miff>

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• Networking problems in VMWare with wireless bridge

  - by Robert Koritnik

  Barebone data: virtualization: VMWare Workstation 6.5 (latest) Host: Windows Server 2008 x64 Guest: Windows Server 2008 x86 Host network adapter: wireless Guest network adapter 1: over Bridge VMNet (automatic) Guest network adapter 2: over Host only VMNet Problem When I surf the net within VM my internet connection just gets stalled (not dropped). It doesn't experience any timeout whatsoever, it just stops downloading/communicating. For instance: I start downloading a file with a browser (IE/FF/CR doesn't matter) and I have to pause/restart download when speed drops to 0. I could wait indefinitelly but connection won't pickup automatically. What did I miss in my network configuration? Update 1 I've tested this in various combinations. This works fine when host is connected via Ethernet. But when connected via Wifi, the connection on the guest works as previously described. It connects fine. It gets a valid IP from DHCP... Everything is cool as long as you don't start doing some intensive network traffic (ie. download a 2MB file) In this case it starts downloading and stops after a while. Speed just drops to 0B/s... Sometimes it picks up back, sometimes it doesn't. Connection still stays and works. I can ping around with no problem.

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• Flash alternative for iBook Mac?

  - by Hunter Dolan

  I have a old Apple iBook G4 that I decided to hook up to my main TV. I like the setup because I can surf the internet on my TV now. The only thing that I can't seem to do is watch Flash videos. Apparently Flash Player 10 doesn't play nice with the iBook's graphics card's GPU, leaving all the graphics processing to the CPU which is a disaster. Others suggested downgrading to Flash Player 9, I did that, and youtube worked fine, but Hulu (The main reason I wanted to hook it up to the TV in the first place) did not. Anyone know of a Flash alternative or a Flash 10 fix for the iBook? Or even a Hulu client that doesn't require Flash. Here are my iBook's Specs Model Name: iBook G4 <br> Model Identifier: PowerBook6,5 <br> Processor Name: PowerPC G4 (1.2) <br> Processor Speed: 1.2 GHz <br> Number Of CPUs: 1 <br> L2 Cache (per CPU): 512 KB <br> Memory: 512 MB <br> Bus Speed: 133 MHz <br> Boot ROM Version: 4.8.7f1 <br> Mac OS X Version: 10.5.8 <br> PS: Don't tell me that I need to buy a new computer. I know that I would have better results with a new computer but I don't want to buy a new computer just for Hulu.

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• Hints on diagnosing performance issue in OpenBSD firewall

  - by Tom

  My OpenBSD 4.6 pf firewall has started having really bad performance in the past few weeks. I've isolated the firewall (as opposed to the WAN connection, switch, cable, etc.) as the problem, but need a hint on how to further diagnose or fix the problem. The facts: Normal setup is: DSL Modem - FW Ext. NIC - FW Int. NIC - Switch - Laptop Normal setup described above gives only 25 Kbps! Plugging the laptop straight from the DSL modem gives a 1 MBps connection (full speed, as advertised). Therefore, the DSL connection seems to be OK. Plugging the laptop directly into the firewall's internal NIC (bypassing the switch) also gives only 25 Kbps. Therefore, the switch does not seem to be a problem. I've replaced the ethernet cables, but it didn't help. Here's the weird thing. Reloading the ruleset (/sbin/pfctl -Fa -f /etc/pf.conf) causes the laptop's connection to go up to 1 Mbps (i.e. full speed) for a few minutes before it gradually degrades back down to 25Kbps again. Any ideas on what's wrong or how I could further diagnose the problem?

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• LTO 2 tape performance in LTO 3 drive

  - by hmallett

  I have a pile of LTO 2 tapes, and both an LTO 2 drive (HP Ultrium 460e), and an autoloader with an LTO 3 drive in (Tandberg T24 autoloader, with a HP drive). Performance of the LTO 2 tapes in the LTO 2 drive is adequate and consistent. HP L&TT tells me that the tapes can be read and written at 64 MB/s, which seems in line with the performance specifications of the drive. When I perform a backup (over the network) using Symantec Backup Exec, I get about 1700 MB/min backup and verify speeds, which is slower, but still adequate. Performance of the LTO 2 tapes in the LTO 3 drive in the autoloader is a different story. HP L&TT tells me that the tapes can be read at 82 MB/s and written at 49 MB/s, which seems unusual at the write speed drop, but not the end of the world. When I perform a backup (over the network) using Symantec Backup Exec though, I get about 331 MB/min backup speed and 205 MB/min verify speeds, which is not only much slower, but also much slower for reads than for writes. Notes: The comparison testing was done on the same server, SCSI card and SCSI cable, with the same backup data set and the same tape each time. The tape and drives are error-free (according to HP L&TT and Backup Exec). The SCSI card is a U160 card, which is not normally recommended for LTO 3, but we're not writing to LTO 3 tapes at LTO 3 speeds, and a U320 SCSI card is not available to me at the moment. As I'm scratching my head to determine the reason for the performance drop, my first question is: While LTO drives can write to the previous generation LTO tapes, does doing so normally incur a performance penalty?

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• What benchmark tool to use to benchmark hardware for VM server?

  - by Mark0978

  We are setting up a new piece of hardware to virtualize several of our servers on. Choices are RAID 5, RAID 6, and RAID 0+1. We are wanting to benchmark all three before we go live with the machine, but I'm not sure how to test the speed. Since we will be using it to host VMs, what will the actual disk traffic look like? What can I use to see if RAID 6 is too slow? Short of setting up the system with all the VM's on it and running that way, then redoing on all the work, I'm not sure how to test it. It them becomes more of a subjective test than an objective one. I'm worried that RAID6 will have too much overhead, that RAID5 will be to fragile with 3TB drives and I've never worked with 0+1 at all. So in short I'd like to setup the base machine (which will be running Linux) and then test the underlying SW RAID for speed. What kind of tool exists to simulate this kind of load? Barring the lack of a specific tool, how about a generic FS testing tool that will simulate different loads?

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• What LTO 4 drive to buy

  - by pplrppl

  Evan Anderson mentioned in another solution you could buy a LTO-4 (autoloader, 1 tape / day) - $4,566.00 (the discussion included total cost of tapes for a specific rotation.) but I don't know specifics on what he or you would recommend for the actual drive and if necessary controller. Show me a newegg URL or CDW, Dell, or HP, or whatever your favorite vendor would be for your solution if you don't mind looking it up or just give me a brand and a model number and I'll be glad to do the leg work myself. I currently have on have on hand an external LTO 3 drive that uses LVD SCSI interface (and thus have a controller card that has an external LVD SCSI connector). If that card isn't sufficient to interface to a LTO 4 drive let me know. http://www.fujifilmusa.com/shared/bin/LTO_Overview.pdf shows minimum tape speeds for LTO4 and other LTO formats. It looks like the IBM LTO4 actually has a lower minimum speed than the IBM LTO3. Either way my average server is too slow to feed LTO3/4 without shoeshining so I'm looking for a drive with a low minimum write speed. If you trust the PDF from 2008 that makes my choices IBM LTO 4 full height IBM LTO 4 half height HP LTO 4 half height but presumably there are other options out there that weren't mentioned in the fuji PDF. Again I'm looking for a specific recommendation on a drive to buy (and the controller if needed).

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Does fast typing influence fast programming?

  - by Lukasz Lew

  Many young programmers think that their bottleneck is typing speed. After some experience one realizes that it is not the case, you have to think much more than type. At some point my room-mate forced me to turn of the light (he sleeps during the night). I had to learn to touch type and I experienced an actual improvement in programming skill. The most surprising was that the improvement not due to sheer typing speed, but to a change in mindset. I'm less afraid now to try new things and refactor them later if they work well. It's like having a new tool in the bag. Have anyone of you had similar experience? Now I trained a touch typing a little with KTouch. I find auto-generate lessons the best. I can use this program to create new lessons out of text files but it's only verbatim training, not auto-generated based on a language model. Do you know any touch typing program that allows creation of custom, but randomized lessons?

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• Networking problems in VMWare with wireless bridge

  - by Robert Koritnik

  Barebone data: virtualization: VMWare Workstation 6.5 (latest) Host: Windows Server 2008 x64 Guest: Windows Server 2008 x86 Host network adapter: Ethernet (see comment) Host network adapter: Wireless (see comment) Guest ethernet network adapter 1: Bridged VMNet (automatic) Guest ethernet network adapter 2: Host only VMNet comment: my host has LAN and Wifi but only one at the same time. I'm either wired or wireless. Never both. So bridged connection on VM goes either via wire or air. Problem When I'm wirelessly connected on the host and I access internet within VM my connection just gets stalled (not dropped). It doesn't experience any timeout whatsoever, it just stops downloading/communicating. For instance: I start downloading a file with a browser (IE/FF/CR doesn't matter) and I have to pause/restart download when speed drops to 0. I could wait indefinitely but connection won't pick-up automatically. What did I miss in my network configuration? Update 1 I've tested this in various combinations. This works fine when host is connected via Ethernet. But when host is connected via Wifi, the connection on the guest works as previously described. It connects fine. It gets a valid IP from DHCP... Everything is cool as long as you don't start doing some intensive network traffic (ie. download a 2MB file) In this case it starts downloading and stops after a while. Speed just drops to 0B/s... Sometimes it picks up back, sometimes it doesn't. Connection still stays and works. I can ping around with no problem.

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• Curios: What makes CPUs better than others? [closed]

  - by Zizma

  I have been wondering about this for a long while now and was hoping someone here could answer it pretty easily. If I was looking for the most powerful CPU what should I really be looking at? There are so many different parameters of a CPU and I am wanting to know what each thing does and what really matters. Basically this: What is the deal with cores? If I take using optimized applications out of the mix would it theoretically better to get quad core 1.0GHz CPU or a 1 core 4 GHz CPU? Also, what is the difference between maybe an Sandy Bridge CPU versus an Ivy Bridge CPU? If they both were had the same clock speed and number of cores would the Ivy Bridge perform better? Does an older Xeon with an equal clock speed and number of cores to a new i7 really perform worse/slower? Does size matter? Why would I go with a 22nm CPU over a 32nm when the size difference is so trivial? What about the cache? When does the cache come into play with performance?

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• Speeding up Outlook Express on Windows XP over satellite

  - by John

  My brother is in the field with Doctors Without Borders. I'm posting this question on his behalf. We use outlook express (on a pc running windows XP) and a 9600 baud dial up satellite phone modem to get our email direct from the server in Paris. As this is a very expensive way to communicate (our satellite bill is $50K a year, no joke), it seems like trying to streamline is a good idea. Here's the question- when we connect, the sequence goes: Send outbox mails. This goes pretty quickly, probably 10-15 seconds for each email, up to maybe a couple minutes for an email of 150k or so). The status bar moves pretty quickly, according to the emails sent. The system then says "Checking for new messages on (our account name), and "Receiving list of messages from server". This takes a long time. Like 10-15 minutes. The status bar crawls along. Then it receives the messages. "Receiving messages from server". Again, each message takes 10-15 seconds, and this part moves along reasonably fast. I'm curious as to what is going on in the second part. It takes forever, and doesn't seem to be part of the sending or receiving messages themselves. Is there a way to speed up the process by changing a preference with communicating with the server or something? Does anyone have any advice for him speeding up what Outlooks Express is doing? Obviously his software is ancient and adding more software is not realistic based on the connection speed. Thanks!

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• It takes a long time until Windows XP recognize I connected USB drive

  - by Pavol G

  I have a problem with my new USB disk. When I connect it to my laptop with Windows XP SP2 it takes about 4-5min until Windows recognizes it and shows it as a new disk. I can also see (disk's LED is blinking) that something is scanning the disk when I connect it; when this is done Windows immediately recognize it. Also when I'm copying data to this disk the speed is about 3.5MB/sec. It's connected using USB2.0. I tried to check for spyware (using Spybot), also tried running Windows in safe mode. But still have the same problems. Do you have any idea what could help to solve this problem? On Windows Vista (another laptop) everything is ok, disk loads in about 15sec and speed is about 20-30MB/sec. Edit: I tried to update to SP3 - no change Edit2: When this "strange" scanning occurs I can see that DPCs process is taking about 50% of CPU. When the scan ends (after 5min) this process take 0% again. Edit3: About the scan time, currently it's taking about 5min, but this time is growing as I'm adding more data to the disk, currently its about 40GB and I don't want to see how long it will take with 1000GB. Thanks a lot for every advice!

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• Hard Drive benchmark values show write very very slow

  - by John

  I recently started to have issues with my laptop being very slow. I ran a hard drive benchmarking tool (by ATTO) that showed that the write speed was very very slow on my boot drive. I ran the same benchmark on my usb drive and it was 650 times faster than my boot drive when it came to writing. Reading is very fast/normal on both. I swapped out an identical drive and ran the same benchmark. This time the drive showed proper write speed. Thinking that I had a hard drive going bad I cloned the old one onto the new one. I managed to clone the problem too. Anyone have any ideas on what in WinXP SP3 might be causing the write issues? I am on a corporate network and we have commercial anti-virus software installed. (AVG I think) I regularly run defraggler and have about 40 gig free on a 100 gig drive. The machine has 4 gigs of memory. Any ideas? TIA J

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• The bottlenecks of any computer, what to look for?

  - by WebDevHobo

  Whether it is a laptop or a desktop, any computer is made up of several pieces of hardware that communicate with each other. Sending data back and forth to ensure that the user gets the desired results. I have seen some theoretical stuff on computers & hardware, but I wonder how it all comes together. CPU RAM Graphics Card L1 CACHE L2 CACHE L3 CACHE FSB ... And all other things. Which is the biggest bottle neck? Why would a person not want/need a big value in one of those categories in certain situations? P.S.: when reading the specs of the i5 750 processor, I came across this description: In place of the FSB, one or more high speed, point-to-point buses called Quick Path Interconnect (QPI) are used, formerly known as Common Serial Interconnect Bus or CSI. QPI features higher bandwidth than the traditional FSB and is better suited to system scaling. What is this, and how does it compare to FSB? EDIT: I am not planning to buy a computer at all. The goal of this question is to understand the internal relation of various hardware pieces, their specific functions and how they work together. For instance, I have heard to a somewhat higher-than-usual amount of L2/L3 Cache can help speed up your computer. What's up with saying that? Also I forgot to mention Hard-disk RPM.

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• Win 2008 R2 - copying TO disk is very slow, copying FROM is more or less okay

  - by avs099

  I have Windows 2008 R2 SP1 with 4 identical SATA disks (Seagate Barracude 7200) in RAID 5 array. It has 4Gb of memory; all recent updates are installed. Problem: when I copy large file from one folder to another, I get about 10MB/s average speed. When I read this file from network share via 1Gbps connection - I get about 25-30 MB/s. Both numbers seems to be low for me - but specifically I'm very frustrated with low write speed. there is no antivirus, no hyper-v, it's just a fileserver - i when i do my tests nobody else reads/write from it (we have only 4 people in a team, so I'm sure). Not sure if that matters, but there is only 1 logic disk "C" with all available space (1400 GB). I'm not an admin at all, so I have no idea where to look and what other information to provide. I did run performance monitor with "% idle time", "avg bytes read", "avg byte write" - here is the screenshot: I'm not sure why there are such obvious spikes. Any idea? Please let me know if you need me to provide more information - what counters should I check, etc. I'm very eager to get this solved. Thank you. UPDATE: we have another Windows 2008 R2 SP1 server with 2 RAID1 arrays - one is disk C (where windows is installed, another one is disk E). It is running Hyper-V and does not have antivirus. I noticed the following behavior when I copy large file (few GBs): C - C: about 50MB/sec C - E: about 55MB/sec E - E: 8MB/sec!!! E - C: 8MB/sec!!! what could cause this?? E drive is RAID1 array from same Seagate Barracuda 1TB drives..

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• Setting my NIC to full duplex

  - by David

  I am trying to optimize the network speed of my Solaris X86 server, and have discovered that the Cisco 3548 that it is connected to has issues with the NIC in my server. The NIC appears to have not been configured fully, and is coming up 100 half-duplex. The 3548 ports are all set to 100 full. Ideally I'd like to have the server set for 100 full, and have been attempting to configure it using ndd commands. However I have had no results. The following command: -bash-3.00# dladm show-dev rtls0 link: unknown speed: 100 Mbps duplex: unknown The NIC shows up as: pci bus 0x0001 cardnum 0x06 function 0x00: vendor 0x10ec device 0x8139 Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ which should be configurable. I have modified the configuration file from auto config (5) to 100 fdx (4) to no avail. If there is no other choice, I could alter the Cisco 3548 to be 100 half-duplex. However, this solution causes huge performance loss. Currently throughput is about 500Kbps, when it should be around 40Mbps.

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• is it good to have or difference between ADSL Modem+WiFi Router and Separate ADSL Modem & Wi-Fi Router?

  - by vikas devde

  I have ADSL2 Modem which I got from my service provider, now I want to setup wireless(Wi-Fi) in my home. I went to shop, where I came to know that there are routers which come up with modem also but they are priced lil higher than the only wi-fi routers. Now it is obvious that I should go for only wi-fi one, as I already have modem. My question is, is there any difference between ADSL+router and only router? I think if I use ADSL+router, the speed will increase lilbit, as modem does modulate and demodulate signals, and router also generates wireless signal, that is time to take conversions is doubled, and if I use ADSL+modem, it will directly convert the signals to wireless, and time will be saved, so the overall speed will increase lilbit. This is what my concept is(Which might be wrong). What do you guys would suggest me? should I take my current modem away and buy an ADSL+router or I should keep my modem and buy only wi-fi one. Please tell me the difference and suggest me which one I should go with, and also suggest me which company router I should go for.

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