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• Why does my CPU Usage reach 100% too often?

  - by deathlock

  I'm using a dual-core processor and often see my CPU usage reaches 100%. I realize this may happen if I'm running too much applications, so when I know the computer starts to run slowly, I start to close my applications. I usually run 4-5 applications simultaneously. Usually those are: web browser (Google Chrome), Adobe Photoshop, Notepad++, XAMPP, and Windows Task Manager. Usually I close tabs in my Chrome first, because I often browse the net with about 20 tabs/4 windows open, so I presume that would take much memory (bad habit, I know). But even after closing Chrome's tabs or closing other applications, my CPU Usage often stays at high percentage - 72% at best, 100% at worst. I check the Processes tab on Windows Task Manager and usually found the System, System Idle Process, or services.exe taking the highest CPU process (could reach 60). Why is this happening? And is there any solution? EDIT I have T2250 @ 1,73 Ghz and 2.5 GB RAM

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• Running IPv4 program in IPv6 network

  - by stobyer

  I have an IPv4 windows client program and IPv4 Linux server. What I need is to run them in pure IPv6 network, although machines have dual stack. At the beginning I thought it's not a problem: I'll use 4in6 protocol (rfc2473) and that's all. I found a simple guide for Linux configuration here, but when I started to configuring windows 7, I couldn't find how to do it. There are plenty of info on how to tunnel IPv6 over IPv4 (6in4, Teredo) but not an opposite. Does anyone know how to do it? Thank you.

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• Cisco configuration for public library internet

  - by AlternateZ

  I'm a C/C++ computer programmer turned IT support guy working for a public library. My day is usually spent helping random grandparents learn how to use email, so my networking knowledge is limited to what I can glean from google. Here's the situation. We have a public library with 20 PCs on a LAN and also public wifi access. Previously we were running all of this on 1 ADSL connection and people complained about low speeds. We hired a networking company to set up a Cisco dual-WAN router for us, and purchased an additional ADSL connection. The intention was to give the LAN PCs a guaranteed amount of bandwidth each, and then let the wifi users split the rest. The results were far worse than what we expected, and all we got from the company was excuses and they've since washed their hands of us. During busy periods, net performance on the LAN PCs are so poor that attaching files to gmail etc often times out and fails - far from the "guaranteed amount of bandwidth each" that we hope for! Sometimes it feels like performance is worse than before when we had 1 ADSL link and an unconfigured router? Anyways, surely this is a problem encountered a million times over across the world? (Sharing internet across many users effectively.) What are standard solutions for something like this? I admit to not even knowing the right jargon to google for (load balancing?) I'd appreciate any links to resources/guides that might help me get a better understanding of the problem/solutions, and perhaps some stories of your own experience in solving similar problems. This will help us evaluate and negotiate with network consultants in the future. If its relevant, our router config contains a section "policy-map" with "bandwidth percent" for each class of user (LAN, wifi), and "fair queue".

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• NATing with a single-homed machine possible?

  - by Harry

  I have the following setup: a) a single-homed machine, A, that can see the Internet. b) other machines B, C, and D that cannot see the Internet. c) A, B, C, and D can see each other. d) all machines are running either RHEL 5.3 or Fedora 16. Question: Is it possible to have B, C, and D share the Internet connection with A somehow? Note, again, that machine A does not have a second NIC installed. (The solutions that I am finding on the Net assume A to be a dual-homed system!) Also, could you please recommend a set of book(s) or online resources for a current and in-depth coverage of iptables for people with only a basic knowledge of TCP/IP?

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• Justification of Amazon EC2 Performance

  - by Adroidist

  I have a .jar file that represents a server which receives over TCP an image in bytes (of size at most 500 kb) and writes it file. It then sobels this image and sends it over TCP socket to the client side. I ran it on my laptop and it was very fast. But when I put it on Amazon EC2 server m1.large instance, i found out it is very slow - around 10 times slower. It might be the inefficiency in the code algorithm but in fact my code is nothing but receive image (like any byte file) run the sobel algorithm and send. I have the following questions: 1- Is it normal performance of Amazon EC2 server- I have read the following links link1 and link2 2- Even if the code is not that efficient, the server is finally handling a very low load (just one client), does the "inefficient" code justify such performance? 3- My laptop is dual core only...Why would the amazon ec2 server have worse performance that my laptop? How is this explained? Excuse me for my ignorance.

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• Separation of memory oriented process and CPU oriented process

  - by Jeevan Dongre

  I am develops guy working for an e-commerce company I am running my e-commerce application built using ruby on rails spree commerce. I am presently running 2 medium instances in the production. One is a high memory instance which has 3.8 RAM and single Core CPU and another one is high CPU instance which has Dual Core CPU. Basically AWS calls it has m1.medium and c1.medium instance respectively. My question is it possible to separate the processes according the cpu intense and memory intense? So that all the cpu intense process can be made run in high cpu instance and all the memory intense process can be made to run in the high memory instances. Is any tool available to identify those process. Kindly give me some heads up. Thank you

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• Second Monitor "Input Not Supported"

  - by Drew

  I have two identical monitors (new Acer s211hl) with a native resolution of 1920x1080. When enabling dual monitor support in Windows 7, the primary monitor works as expected, but the second monitor says, "Input not Supported" and fails to display anything. If I change the resolution of the second monitor to 1440x900, it works as expected. Likewise, if I set it to 1920x1080 with a refresh rate of 30hz, the monitor displays video. However, neither of these are solutions, because the output looks very blurry, and the content is stretched. I am using the following hardware: Monitors: Acer s211hl Motherboard: Asus F1A75M-Pro CPU/GPU: AMD A8-3850 with integrated Radeon HD 6550D graphics I suspect that there is probably an issue with the integrated graphics or motherboard not being able to output to two 1920x1080 monitors, but I am hoping for official confirmation.

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• Pulling application updates from closest server?

  - by Mike Morris

  Setup: 6 Major Sites with Server 2003/2008 DCs doing DHCP/AD Integrated DNS, each on their own subnet. All connect back to datacenter through a 3 mbps WAN ERP server running in the datacenter, accessed by clients at all sites Currently, when we update the software, I manually push a copy of the updated client/config files down to each DC. I have a script that we run on each PC to update the clients. It determines what subnet the PC is on, and pulls the software from that DC. It's messy, but it works. The client has an autoupdate feature, but it'll only pull from the application server (which is housed in the datacenter, over the 3 meg link). It takes forever, since the updates are not "patches" but a full version of the client, even for minor upgrades (bad design). After the most recent patch, you can configure the clients to pull from a different server. Unfortunately, it is the same for all clients. Is there some kind of DNS magic I can use to pull from the local server? For instance, if I tell the clients their update server is ERPUPDATE, can I have their local DNS server return a different IP for ERPUPDATE than the other sites? Example: Client 1 is at site A, client 2 is at site b. They each run the software and a version change is detected. As per the config files, the clients look to ERPUPDATE for their updated client. Client 1 queries DNS for the IP of ERPUPDATE at its current location (site A) DNS at site A returns 192.1.1.5 Client 1 pulls update from 192.1.1.5 Client 2 queries DNS for the IP of ERPUPDATE at its current location (site B) DNS at site B returns 192.1.2.5 Client 2 pulls update from 192.1.2.5 Excuse the poor explanation, I worked 61 hours over the weekend and haven't completely rebounded. I'll be happy to clarify if needed!

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• Wireless performance on Ubuntu 9.10

  - by Brian

  Is there something I should do to my networking configuration in Ubuntu to better the performance of my wireless connection? I'm on a netbook dual-booting Windows 7 and Ubuntu 9.10. I pick up much stronger wifi signal when in Windows than Ubuntu. As soon as I boot Ubuntu, it will connect to the network with a stronger signal, and then loses signal very quickly. After it dies, I can't reconnect. I've tested this on a couple of different networks with the same outcome.

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• PC reboots regularly

  - by Bob

  Windows XP RAID 5 drives Intel Dual Core processor 2 GB Ram I am running a processor temperature monitor. It does not appear to be overheating. I do not have virus. The PC freezes and reboots. I do not think it is software related, because it will reboot if it is doing nothing. Could it be the power supply? Might i need to replace it? How do I diagnose this? Is this the kind of question that is appropriate here? I am not sure.

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• Change Apache DocumentDirectory path in trueCrypt partition

  - by Alan C

  Hello, I'm recently moving from windows to linux, so I've setup my machine to dual boot Windows7 and Ubuntu 10.04. I was able to successfully setup Apache on the Ubuntu partition, but I need to move the DocumentRoot since my websites are on a TrueCrypt partition that is in another hard drive so I can have them accessible in both OS. I followed some guides on how to change the path for the DocumentRoot so I end up modifiying the default file at /etc/apache2/sites-available DocumentRoot /media/truecrypt1/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /media/truecrypt1/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Those are the lines that I've changed, but now when I go to localhost I always get the Forbidden You don't have permission to access / on this server. Apache/2.2.14 (Ubuntu) Server at localhost Port 80

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• Make GRUB 2 boot Windows 8 safe mode

  - by Tim

  I have a dual boot configuration: Windows 8 Consumer and Ubuntu 11.10. I tried to install the Asus drivers for my motherboard (P8Z68-V LE EFI) in windows 8, and i now get bluescreens when starting windows. Holding F8 or Shift-F8 doesn't seem to be working, so is there another way to get into Safe Mode, or uninstall the errant driver? I need to get into Safe Mode in windows to fix the issue. Things I have tried: Disabling overclock Holding F8 or Shift+F8 How can i get GRUB 2 to boot windows 8 in safe mode? Or is there another way to disable a driver that is making it impossible to boot?

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• Headphones stopped working in Windows (working fine in other OS)

  - by arnab321

  All of a sudden, my headphones stopped working with windows 8 in my laptop. Sound plays fine through built in speakers. Its not a problem with the hardware, because, I dual boot ubuntu and sound plays fine in Ubuntu. These are the things I have tried: - Restarting and blah blah. Restarted 20 times i think, alternating windows and ubuntu. - Uninstalled and reinstalled Realtek drivers. - Troubleshooting from control panel (it says "coudnt identify problem") What might be the problem?

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• Can't burn 8.1G iso onto 8.4GB DVD - "Media does not have enough free space"

  - by Max Williams

  I'm trying to burn a dvd on a mac with an external (firewire-connected) dvd drive. I'm checking the size of the iso thus: DVD-4:dvd_files macbook$ ls -l /tmp/hybrid.iso -rw-r--r-- 1 macbook wheel 8700884992 Aug 22 10:57 /tmp/hybrid.iso DVD-4:dvd_files macbook$ ls -lh /tmp/hybrid.iso -rw-r--r-- 1 macbook wheel 8.1G Aug 22 10:57 /tmp/hybrid.iso The "human-readable" size is 8.1 Gig but when i try to burn, onto an 8.4G dual-layer dvd, it says "Media does not have enough free space" The definition of a "Gigabyte" according to Wikipedia is 1 billion bytes, so the iso size should actually be 8.7 Gig according to this definition, in which case the disk definitely isn't big enough, and it's just that the -h option to ls is misleading. Is the discrepancy just due to the ls command using a different definition of "G" (eg 1024 Meg aka 1.07 Gig? This comes out as 8.103 which fits what ls is displaying)

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• Git multi-master, is it possible?

  - by Fran

  Hi, Is it possible to set a dual master GIT repositories? I would like to set up two different servers which I could push and commit to and changes on any of them would be propagated to the other. I've googled for it, but the most similar solution I've found is Gerrit2, but it does only one way replication (master - master). Does anybody know if this is even possible to do with git? If so, could you please tell me which tools to use? Thanks in advance.

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• Proxying/Tunneling IPSec traffic via netcat or SOCKS?

  - by MattC

  I have a client that is using a SonicWall router as their VPN concentrator. I downloaded the client software and set up the router as a peer. My issue is that my company uses a dual DMZ setup, meaning we have an interior firewall, then a bunch of DMZ servers, then an external firewall, then finally the telco router. In this setup, the interior firewall has no way to communicate with the exterior firewall since they are on two totally separate subnets. The communication occurs through the servers that straddle the networks. In this case, I need some way to forward the ISAKMP/IPSec traffic from my desktop out to the Internet. My usual trick of using netcat on the intermediate proxy server doesn't work here since it's not TCP/UDP traffic as far as I can tell. All of my previous experience with VPN's have been using SSL-based VPN's which are clearly very easily proxy-able. Any help would be appreciated, thanks!

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• Steps to debugging web site latency and timeout issues

  - by Paperjam

  I have a client who has multiple offices around the country, all of which share the same Internet connection via their WAN. One specific office for this client is experiencing severe latency and timeout issues with my web site. Most, but not all, of the latency occurs on a specific ASPX page where multiple postbacks are made while populating cascading dropdown lists (rapid form submits). The latency is sporadic and can be anywhere from a few seconds to a full timeout. There is no indication that the timeouts are occurring on the server's end. The IT guy for this client is having trouble narrowing down the problem. Since it is affecting only one location for one client, I am led to believe it is not something with my site but something specific to that location. He's measured ping times while using the site and has noticed no real variance in ping times even when the page has timed out. I believe this may be being caused by some sort of Internet filter that doesn't like rapid form submits, but beyond a hunch I haven't a clue. My question is what things should I tell the IT guy to look for? While I'm not trying to provide active tech support for this issue, I would at least like to glean an understanding of what is going on and try to offer some sort of advice. Thank you.

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• Boxee on Dell 32in TV causes headaches, how to troubleshoot?

  - by brown145

  I have revamped an old pc, installing 4GB ram and a 256MB video card so that I could run Boxee to a Dell W3200 series TV that came with my apartment. It is connected via VGA, resolution is 1360x768, 24bit color, 60Htz refresh rate. Unfortunately, every time I use it I end up with a headache after less that 30 min. I have had my eyes check recently, and am able to play xbox (connected via hdmi) on the same TV without problems. What are the potential causes? My system seems to well meet or exceed the min requirements for boxee, XP, AMD Atholon 64 X2 Dual Core, 4GB RAM. Could it be the VGA cable? What is the most cost effective way to trouble shoot?

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• mpstat on slackware 13.0 shows no utilization

  - by conartist6

  As the title says, the mpstat command, executed on Slack 13.0 continuously shows almost no processor utilization of any sort. In fact none of the output ever seems to change at all. The system is dual processor board with two hyperthreaded P4 Xeons. Any ideas? 08:50:06 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 08:50:06 PM all 0.38 0.00 0.03 0.03 0.00 0.00 0.00 99.56 1510.46 08:50:06 PM 0 0.50 0.00 0.05 0.10 0.00 0.01 0.00 99.33 11.90 08:50:06 PM 1 0.32 0.00 0.03 0.01 0.00 0.00 0.00 99.64 0.00 08:50:06 PM 2 0.38 0.00 0.03 0.01 0.00 0.00 0.00 99.58 0.00 08:50:06 PM 3 0.29 0.00 0.02 0.00 0.00 0.00 0.00 99.68 0.00 This is, literally, the only output I can get from the program. No values change ever.

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• Are there any 17-20 inch monitors that support displayport?

  - by WildJoe

  I've got dual monitors now (both 20 inch 1600x1200). After seeing the new eyefinity cards out there (and reading the CodingHorror post on three monitors) I've decided to get a third. It's time to upgrade my video card anyway. Since I don't already have a third monitor and will be buying one new, I figure it'd make sense to buy one that already had a DisplayPort interface so as to avoid the adapter issue. However, I can't seem to find any monitors on newegg that support this (it's not even an option in the power search, and a keyword search turned up only adapters and video cards). A quick google showed me several 30 inchers (like Dell's, but that's way too expensive, and I don't have that much room on my desk even if I had that money) and some 22 inch models. Again, I'm looking for a 17-20 inch with a DisplayPort interface built in. Any suggestions?

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• Why do I get a GRUB error after deleting the Linux partition?

  - by nateify

  I had a dual-boot setup with Windows 7 and Windows Vista. I used Easus Partition Manager and shrank my Windows 7 partition. In the empty space, I installed Linux Mint. I decided I didn't want it anymore, I simply deleted the Linux Mint partition. Now when I boot, all I get is this: GRUB loading. error: no such partition grub rescue> I don't have my Windows 7 install disk because it was pre-installed.

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• How to automatically take daily HDD backup?

  - by user13107

  I think my HDD might have crashed. I don't want to lose data if this happens again. I have dual boot Windows/Ubuntu system. What is the best way to backup data and other software settings in Ubuntu? I don't care much about Windows partition, important stuff is in Ubuntu. I have 1 Tb external HDD (laptop HDD is of 500 gb total). One way would be to run rsync every day (or via cronjob) to backup everything to external HDD. What might be better ways of achieving this (backup)? Also are instant backup software recommended? Are there any disadvantages of instant backup as opposed to daily rsync?

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• Why is this iptables rule that does port forwarding not working?

  - by videoguy

  I have a server bound to localhost:7060. It is using ipv6 socket instead of ipv4. Below is netstat outout. # netstat -an Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 10.200.32.98:1720 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:4122 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:4123 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:4123 127.0.0.1:43051 ESTABLISHED tcp 0 0 10.200.32.98:5555 10.200.32.44:53162 ESTABLISHED tcp6 0 0 :::5060 :::* LISTEN tcp6 0 0 ::ffff:127.0.0.1:7060 :::* LISTEN tcp6 0 0 :::23 :::* LISTEN tcp6 0 0 ::ffff:10.200.32.98:23 ::ffff:10.200.32.142:43505 ESTABLISHED tcp6 0 0 ::ffff:127.0.0.1:43051 ::ffff:127.0.0.1:4123 ESTABLISHED tcp6 0 0 ::ffff:10.200.32.98:23 ::ffff:10.200.32.44:53195 ESTABLISHED udp6 0 0 :::5060 :::* CLOSE # I want to setup a port forwarding rule that accepts connections on port 24 (on all interfaces loopback as well as eth0) and forward the data to localhost:7060. This is how I am setting up the iptables rule: iptables -t nat -A PREROUTING -p tcp --dport 24 -j DNAT --to 127.0.0.1:7060** It is not working. When I telnet from different box, I see the following $telnet 10.200.32.98 24 Trying 10.200.32.98... If I change the server to bind to *:7060 and set the following rule, it seems to work fine. iptables -t nat -A PREROUTING -p tcp --dport 24 -j REDIRECT --to-port 7060 But that will make my server available on WAN interface which I don't like. I feel it had something to do with ipv6 socket (tcp6 line in netstat output). This whole thing is done on an Android device with custom built Android platform image. How do I get this working?

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• Reasons for Wi-Fi to be slower on Ubuntu compared to Windows?

  - by den-javamaniac

  I'm using 64-bit Ubuntu 12.04 and Windows 7 64 bit – dual boot on the same computer. Connecting to the same wireless network. And it turns out that on Windows I get a more stable and stronger signal than on Ubuntu. To my knowledge there's a router which serves as a gateway and then there's a cable connected to the router which goes further to ISP, so the results for both OS should be the same. I've tested the issue on both OSs at various times and it gave me the same result. The question is why? Why Ubuntu networking is worse than that of Windows?

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• SQL Server 2005/2008 Licensing Decision

  - by Hakim

  Hello, I have purchased a dedicated server from a reputable Hosting company. They only have Windows Server 2008 OS installed on it and NO Sql server. Server Configuration is Intel Dual core Processor with 2GB of RAM and 100GB HDD. I wanted to host my web services on that server which will be using the MS SQL Server 2005 at the backend.There are multiple web services and each using a different Database. Microsoft has CAL basis Licensing , Which I understand is based on number of users accessing the database directly ( I may be wrong ) . But my users will be accessing the webservice and no direct connection to the database as such. Yes but the number of users accessing the web server cannot be known and is not under my control. Which Licensing is best suited for this kind of setup ? I don't need analysing and BI services right now ,but i may want to upgrade that in future may be. Any help will be appreciated. Thanks

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