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  • Packet loss rate with iperf and tcpdump

    - by stefita
    I tested a line for its link quality with iperf. The measured speed (UDP port 9005) was 96Mbps, which is fine, because both servers are connected with 100Mbps to the internet. On the other hand the datagram loss rate was shown to be 3.3-3.7%, which I found a little too much. Using a high-speed transfer protocol I recorded the packets on both sides with tcpdump. Than I calculated the packet loss - average 0.25%. Have anyone an explanation, where this big difference may be coming from? What is an acceptable packet loss in your opinion?

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  • Load Average runaway

    - by mewrei
    Is there any way to chase down lockups and runaway load averages? Every so often (pretty randomly) I'll get my load average spike up over 5 usually to around 10-15 and sometimes as high as 75 (dual core machine), and cause my system to lock for an indeterminate amount of time. The only thing I can possibly chase it to is using nVidia fakeraid (RAID-1) with JFS on top of that for my /home partition. Also I noticed that when my load averages spike, the power management system doesn't step up my processor speed from 1.6 to its maximum 2.13Ghz clock speed (not sure if this makes a huge difference with this problem). Any ideas?

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  • Is my PC Good enough [closed]

    - by Moinak Nath
    I'm getting a new laptop this Christmas and I was wondering if it's good enough for what I do. I'll be playing games like Need for Speed: Most Wanted (2012) and other NFS games. Also silent hunter and flight sim. I also browse the internet download stuff like, watch movies occasionally type documents with word, edit videos, and transfer files. To be more specific is the hdd big enough? is the ram big enough? Is the graphics card good? is the cpu speed enough, and is Windows windows 8 good for all these things. i also video chat so these are the specs 2.2 Ghz Intel Pentium B960 Dual Core 4 GB RAM 320 GB HDD Intel HD Graphics 720p Webcam 4 USB Ports (2 USB 3.0 @ 2 USB 2.0) HDMI Port It Is a Lenovo IdeaPad This is the one im Looking at http://www.bestbuy.com/site/Lenovo+-+IdeaPad+15.6%26%2334%3B+Laptop+-+4GB+Memory+-+320GB+Hard+Drive+-+Black/6851264.p?id=1218809260330&skuId=6851264#tab=specifications

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  • Should I use 802.11n with a 15 Mbps ISP (Comcast Cable)?

    - by stackoverflowuser2010
    I currently own a LinkSys-WRT54GL 802.11a/b/g wireless router, and my ISP is Comcast Cable providing me with 15 Mbps (that's bits per second, I believe) download speed. I am wondering if there is any benefit with using an 802.11n wireless router to access the Internet? The maximum theoretical speed of the WRT54GL router is 54 Mbps (802.11g), which is faster than the 15 Mbps provided by my ISP. I know that 802.11n has a max bandwidth of 300 Mbps, and it would help for intra-house transfers, such as streaming video from one computer to another. But is there any benefit to 802.11n for Internet activity, such as web browswing, gaming, and streaming video from Netflix?

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  • how to escape “@” in the username when logging in through FTPES with curl?

    - by user62367
    $ curl -T "index.html" -k --ftp-ssl -u "[email protected]" MYDOMAIN.COM Enter host password for user '[email protected]': % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 57173 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>405 Method Not Allowed</title> </head><body> <h1>Method Not Allowed</h1> <p>The requested method PUT is not allowed for the URL /index.html.</p> <hr> <address>Apache/2.2.16 Server at MYDOMAIN.COM Port 80</address> </body></html> 100 57480 100 307 100 57173 284 52902 0:00:01 0:00:01 --:--:-- 53633 can someone help me? Also posted on Stack Overflow

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  • Opinions on NTFS for Mac solution?

    - by AngryHacker
    I am currently using the free NTFS-3G to access my NTFS drive from the Mac. It seems pretty stable (except once in the very beginning, it locked up the Mac and corrupted my NTFS drive, which I then fixed with chkdsk from a PC). However, speed is NOT one of its virtues. In fact, it's painfully slow I've been looking at buying Paragon NTFS for Mac OS X 8.0. Their product comparison PDF claims nearly double the speed (vs NTFS-3G) in almost every category (read, write, etc...). In addition, there is now an unsupported native solution with the snow leopard. Can folks here share their experiences. Is the native solution stable enough to be used for daily work? Should I just go with Paragon?

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  • How does one calculate voltages for overclocking?

    - by TardisGuy
    So, all I know is voltage and clock have something to do with each other. Unstable if too low voltage Too high voltage, and too much heat. or higher voltage + lower clock may heat less than that voltage at higher clock. The reason why im asking is because if I can learn how the power vs speed works, Then i might be able to project some kind of thermal curve to find out where my perfect overclock might be (without 50 burn-ins) But, as is apparent im sure. I have no idea what im talking about. If anyone can help me learn more about this; throw me a page, a macro, whathaveyou I will bow before your awesomeness and... Mail you a phantom hand written thank you letter. Some clarification Rev 1 What im trying to learn: is how much power a cpu is using with measurements (Core Voltage) vs (Clock speed) - It would answer the question: Would a 1.4v core @ 4.0Ghz use as much power as a 1.4v core @ 3.0Ghz?

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  • Open source Distributed computing tool

    - by Prasenjit Chatterjee
    I want to set up distributed computing on my Local Area Network consisting a bunch of PCs. Say for the time being each one has the same OS - Windows 7. Is there any opensource tool available so that I can share the resources of these PCs over the LAN and increase the speed of my applications and the memory space. I know that if its a graphics intensive application then, it is not very practical, because the speed of LAN is much slower than Graphics processors. But I only want to share general applications, some basic softwares, Programming language IDEs etc. Can anyone shed some light on it? Thanks in Advance..

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  • Lightning strike causes fast download?

    - by blaine
    Ok, REALLY strange question. My friend says he was downloading a 14 GB file at about 1 mb/s when suddenly there was a lightning strike outside and momentarily the download speed jumped to 10,000,000 GB/s. The file finnished downloading. He even has the screenshot to prove it. I also trust him and don't believe that he would be lying. So my question is: how is this even possible?? Is there just the possibility that the file was about to finish downloading anyway and the lightning strike coincided with a freak download speed calculation error?

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  • Windows 7 Disk Management Spanned Volume vs Striped Volume

    - by Kairan
    Im looking for a reason why a person would use a Spanned volume rather than a Striped volume? If my understanding is correct Striped: Faster read/write speed than spanned, but I "assume" more wear+tear Spanned: No speed benefit like striped, but data is written sequentially and fills up Drive1 before filling up Drive2, so it saves on wear+tear Beyond that Im not sure if there is any other deciding factor on which to use. Definition found below: A striped volume uses the free space on more than one physical hard disk to create a bigger volume. Unlike a spanned volume, a striped volume writes across all volumes in the stripe in small blocks, distributing the load across the disks in the volume. The portions of disk used to create the volume need to be the same size; the size of the smallest free space included in the striped volume will determine.

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  • Using airport extreme base station as a wireless G to wireless N bridge

    - by micmcg
    Due to unfortunate placement of various wall outlets in my new apartment, my adsl 2 modem + router is not able to be placed next to my airport extreme base station (AEBS). I'd prefer not to run cat5 cable between them, but I still want to use the wireless N on the AEBS, because it will have a high speed NAS plugged in via gigabit ethernet so I want to maximise the wireless transfer speed to my 27" iMac. Is it possible to use one of the radios in the airport extreme to bridge the wireless G network with the router, and the wireless N radio to broadcast normally? The only traffic going over the G network should be internet (24mbps ADSL2) so it should never get saturated. Thanks

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  • PHP vs Batch file for mysql cronjob?

    - by mysqllearner
    Hi, My server details: OS: Windows Server 2003 IIS6 Plesk 8.xx installed (currently using Plesk to set the cronjob) I need your advice. I have 2 methods: Method 1: Using php + mysqldump, create databases backup files into gzip, and then send email with attachment (each databases has around about 25mb) Method 2: Using batch + mysqldump, create databases backup files into gzip, and then send email with attachment (same, each databases has around about 25mb) My questions: Whats the difference of using php file and batch file for cronjob? Which method is better in term of backup speed and send email, and (maybe)safety (e.g., lesser file corrupt occurance)? If i set the cronjob hourly, will it effect my web performances? I mean, lets say my website has 100++ users online now, and each user making transaction to MySQL, when I perform backup at my web peak hour, will it decrease the performances, like the loading speed, prone to errors etc?? (sorry for my bad english) P.S: If you need my php and batch file code, please ask me to post it here. I didnt post it now is because, its very simple and standard code.

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  • Change programfiles variable on windows

    - by Fire-Dragon-DoL
    I have built a computer for a user that asked me for "speed": an SSD was the obvious solution because what he means by speed is "fast boot time". This solved the problem, however the user is not smart enough to remember that he must install programs on D rather than C (c is the ssd, D is an raid 1 hdd). The only solution that comes in my mind is changing programfiles variable such that will point to D rather than C by default. Otherwise, other solutions are ok but I really can't find anything else at the moment. Does anyone have recommendations for how to accomplish changing the default installation directory in Windows?

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  • Snmpd update interface counters slowly or something like this

    - by Korjavin Ivan
    I update one my freebsd box to 9-stable (totally new installation) and install net-snmp for monitoring. uname -r 9.1-PRERELEASE pkg_info net-snmp-5.7.1_7 Information for net-snmp-5.7.1_7: Comment: An extendable SNMP implementation .... cat /var/db/ports/net-snmp/options # This file is auto-generated by 'make config'. # Options for net-snmp-5.7.1_7 _OPTIONS_READ=net-snmp-5.7.1_7 _FILE_COMPLETE_OPTIONS_LIST= IPV6 MFD_REWRITES PERL PERL_EMBEDDED PYTHON DUMMY TKMIB DMALLOC MYSQL AX_SOCKONLY UNPRIVILEGED OPTIONS_FILE_UNSET+=IPV6 OPTIONS_FILE_UNSET+=MFD_REWRITES OPTIONS_FILE_SET+=PERL OPTIONS_FILE_SET+=PERL_EMBEDDED OPTIONS_FILE_UNSET+=PYTHON OPTIONS_FILE_SET+=DUMMY OPTIONS_FILE_UNSET+=TKMIB OPTIONS_FILE_SET+=DMALLOC OPTIONS_FILE_UNSET+=MYSQL OPTIONS_FILE_UNSET+=AX_SOCKONLY OPTIONS_FILE_UNSET+=UNPRIVILEGED I have about 500 vlan on this machine, and collect info about interface through snmpd to 2 different software, zabbix and cacti. And both of them plot the graphs with blank fields. I tryed change polling time in zabbix, from 15, sec to 30,60,90,120,10. And anyway i have blank fields. snmpd.conf is empty - only a access controls. This configuration worked fine on freebsd 8. Where is my fault? How fix this graphs? UPD: Changing pooling time, switch off one of agent, doesnt help. I look at zabbix log (recieved data from snmpd) and see that: sorry for russian locale, just look at numbers: and thats is not true, as my "iftop" show speed was about 90Mbits, but snmpd return 2Mbits. I understand that snmpd doesnt return speed, it return just a counter. But how its possible? why 2Mbit/s ? I tryed recompile snmpd with 64-bit counters, and without it. In both variants this blank fields present. So i think its my OS (freebsd) doesnt update interface counters well. I still collect tcpdump for found this request/response. But have problem with that, to much trash. UPD2: I decrypt tcpdump-ed file, and public this as google doc at gdocfile Timediff looks strange.. Like zabbix sometimes "forget" do request, and then do twice at row, ehh UPD3: I parse log from command "while true; do netstat -bin -I vlan4008 /var/log/netstat; sleep 300; done" and load as google docs, and add formula for speed : link Looks like all counters in OS are good. Now i think problem in : 1. zabbix get request twice at row (and what about cacti) 2. snmpd use counter32

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  • x11vnc is slow, but using only 10% of available bandwidth

    - by mmm
    I am using x11vnc over 15Mbit/s network with 20ms latency. When the screen is changing a lot x11vnc is slow - for example when I switch a tab in a browser, it takes almost two seconds until the view is fully redrawn. The strange thing is that max connection speed of x11vnc is even during slow redrawing only about 10% of the available bandwidth. Why is x11vnc not using available bandwidth to speed the redrawing up? For example scp is using 100% of available bandwidth without problems. How can I identify what is the bottleneck for x11vnc on my system? So far I think: 10% network usage = network is not a bottleneck fb read rate: 601 MB/sec = reading fb is not a bottleneck Any ideas how can I further profile x11vnc and find out what is causing a slowdown? For example is there any switch for x11vnc to show how much data it is handling and how long it takes to grab a screen, process and compress it and send it over the network?

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  • afp/smb transfers caps at 2 megabytes/sec, wireless N

    - by CQM
    I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn't a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n is set to 130mbits, so I should see real world transfer speeds around 12-16 megabytes/sec I did this command on both computers sudo sysctl -w net.inet.tcp.delayed_ack=0 which is supposed to lower tcp overhead, but this did not affect it. How can I get the speed I am expecting?

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  • Monitoring outgoing bandwidth of application

    - by jnolte
    I currently have a VPS that is consuming a ton of outgoing bandwidth and I am trying to drill down to where this may be coming from. Does anyone know of a logical way to go about finding out which pages on the site are consuming the most outgoing data. We have done a ton of front-end optimizations to the site and our google page speed rankings ar 85% so I feel we have done a pretty great job at optimizing the site for speed. Can someone lend some insight on how they have made similar optimizations? Application / Server Stack LEMP Running Varnish Cache / PHP5-FPM WordPress running w3 Total Cache Ubuntu 12.04 LTS

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  • Slow speeds on Samsung SSD PM800 256gb on a Lenovo W500

    - by cc0
    I recently bought a W500 with a 256gb samsung ssd drive. Now it seems ridiculously slow at writing. I am copying files at about 30mb/s, but I can read them at about 200mb/s. I tested it with the AS SSD Benchmark v1.4, and got a sequential writing speed of 34.64mb/s and reading speed of 196.95mb/s When I bought it the drive had only been in use for about 240 hours, and according to the CrystalDiskInfo app it had 98% health. Is there a bottleneck here somewhere? Or is the drive just plain bad. I'd really love it if someone could help me find some answers. The main relevant (I hope) w500 specs for this machine are; T9600 @ 2.8ghz 4gb ddr3

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  • Why does my Mac always crash when I enable `ask for password after screensaver ended`?

    - by Koning Baard XIV
    I have enabled these two things: Placing the mouse-pointer in the bottom-left corner of any display makes the screensaver appear After the screensaver or stand-by has ended, ask for password However, this combination always leads to this (Black Screen of Death) after entering the screensaver with the bottom-left corner: Here are my system specs: Hardware Overview: Model Name: iMac Model Identifier: iMac9,1 Processor Name: Intel Core 2 Duo Processor Speed: 2,66 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 2 GB Bus Speed: 1,07 GHz Boot ROM Version: IM91.008D.B08 SMC Version (system): 1.44f0 Serial Number (system): W89171JF0TF Hardware UUID: 323A90F0-8A2F-5057-B501-2087489E0DFF System Software Overview: System Version: Mac OS X 10.6.3 (10D573) Kernel Version: Darwin 10.3.0 Boot Volume: Macintosh HD Boot Mode: Normal Computer Name: YOU SHOULD NOT KNOW THIS User Name: YOU SHOULD NOT KNOW THIS Secure Virtual Memory: Not Enabled 64-bit Kernel and Extensions: No Time since boot: 11:46 Can anyone help me? Thanks

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  • dev_install failed on ARM chromebook

    - by user1027721
    I'm trying this guide for having access to emerge on chromeos. http://www.chromium.org/chromium-os/how-tos-and-troubleshooting/install-software-on-base-images Unfortunately I always got the same error which is $ sudo dev_install Starting installation of developer packages. First, we download the necessary files. Downloading https://commondatastorage.googleapis.com/chromeos-dev-installer/board/daisy/full-3.168.0.0/packages/app-misc/mime-types-8.tbz2 % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 127 100 127 0 0 252 0 --:--:-- --:--:-- --:--:-- 305 [: 184: -ne: unexpected operator Extracting /usr/local/portage/packages/app-misc/mime-types-8.tbz2 I think that it somehow returns a 404 everytime. Thanks for your help

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  • File downloaded from IIS6/Win2003 server to a Mac (and not PCs) is incredibly slow

    - by Simon Swords
    We have a test zip file on our customers server that we host for him that when downloading to a Mac is incredibly slow. On a Mac - trying the download via Safari 5.0.3 and Chrome 8.0.552.231 results in a quick burst of normal download speed then plummets to almost no speed at all after 1 or 2 meg (between 1 and 5 Kb/s - yes, KiloBITS per second! According to the network monitor). Downloading via Windows was fine and speedy. Tested via; IE7 7.0.5730.13 and Chrome Portable 8.0.552.224 On Windows XP Pro, and; IE8 8.0.7600.16385 in a Windows 7 virtual machine running via VirtualBox 4.0.0 r69151 on the same Mac mention above Google hasn't helped us out on this occasion, possibly because the search terms I'm having to use are quite generic. Has anybody ever experienced this and if so how do we fix it? Thanks in advance

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  • Why does a website server recieve local files much slower than recieve files on other websites?

    - by T...
    The server at http://any2djvu.djvuzone.org receives same files from local computers much slower than from links on other websites (with the same files have been uploaded to the other websites, such as dropbox.com). The speed of uploading a file from local computers to other websites such as dropbox is also much faster than to any2djvu website. For example, a pdf file of 17MB needs more than 1 min to be uploaded to any2djvu server from a local computer with normal ISP such as Comcast High-speed internet, but takes less than 3 seconds from a dropbox link to any2djvu server, and takes around 10 seconds from the same local computer to dropbox. I wonder why there is such big differences for the speeds of different uploading ways to a web server? Thanks!

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  • Options for installing software on Amazon EC2 Windows instances

    - by gareth_bowles
    I've been running Linux servers on Amazon EC2 for a while now; the experience has been great. I've recently needed to bring up a Windows server to run some Windows-only software that our product needs to use, and am running into a problem figuring out how to install the software, which is only available on DVD. With Linux I can just install packages from a Web-based repository and take advantage of EC2's fast network throughput, but so far on the Windows instance I've had to upload my ISO images to EC2 and mount them from the Windows EC2 instance. For some reason I'm getting really slow upload speeds to EC2, even though the regular upload speed from our office is pretty good (around 7Mbps). I've also tried mounting the DVD drive on my machine as a local drive on the EC2 instance via Remote Desktop, and then running the software install from the local drive, but I run into the same slow upload speed issue. Does anyone have a better way to install software from physical media onto an EC2 instance ?

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