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Thread: Slow internet - Linux only

  1. #1
    Join Date
    Apr 2007

    Exclamation Slow internet - Linux only

    Dear community

    I've been having the feeling that my internet connection is much slower on Ubuntu Hardy than it used to be on Windows XP. I did some Googling and found out that disabling IPv6 helped improve many peoples connection. I'm not sure wether it was a placebo effect, but I get the feeling my internet has become slightly faster. Still, my downloads never exceed ~24kb/s.

    I decided to put it to the test. I used to do a test on my PC, and then one on my brothers PC (using Windows XP). The results were shocking:

    Download: 253kbps
    Upload: 65kbps

    Download: >2000kbps
    Upload: >500kbps

    There must be something wrong in a configuration file somewhere. Please help me bring my internet back to good speed! Thanks.

    RT2500 card
    using network-manager
    WLAN network using WEP ASCII key
    Connection strength always around 40% (used to be 70-80% in Windows)

  2. #2
    Join Date
    Apr 2008
    Monterrey, Mexico
    Ubuntu 9.10 Karmic Koala

    Re: Slow internet - Linux only

    Similar problem.... BUMP! ha!
    "We withold the right to smack stupid people"

    Dell inspiron 6400; Intel Core duo T2400 @ 1.83GHz; SATA 500 gig HDD; 2 gig RAM @ 667MHz; Nvidia GeForce Go 7300

  3. #3
    Join Date
    Apr 2007

    Unhappy Re: Slow internet - Linux only

    In a private message:

    Quote Originally Posted by Dizzle7677
    here's a handy network tweaking link...,00.htm
    I tried editing my configuration as the link suggested. It only made things worse, speedtest doesn't exceed 200kbps anymore even. It's depressing.

    Why is the internet on my PC so much slower on Ubuntu Hardy than on Windows XP? (factor 10)

  4. #4
    Join Date
    May 2006

    Re: Slow internet - Linux only

    No idea - I have both XP and Hardy on one machine and there is not the slightest difference.

    You are using two different machines though - use a Live CD on both your brothers machine and your own and see what results you get.

    Also bypass Firefox, I had issues with the IPV6 in the past, and just compare ping results. Open terminal write

    ping -c 6

    That's what I would probably do.

  5. #5
    Join Date
    Apr 2007

    Re: Slow internet - Linux only

    I tested the internet speeds on my own machine (still an XP installation on it). The internet speeds on this machine on XP are over 2000/500, just as on my brothers machine. Ubuntu Hardy still not fast, I got speeds today of 350/60.

    I think it might be a simple setting wrong somewhere, that caps my speeds at dial-up speeds. The reason I for this suspicion is that the System Monitor Panel Applet shows full network usage when I reach the speeds of 350. Could this be because my system is set somewhere that 350kbps is the maximum downspeed? Shouldn't the scaling on the applet be different otherwise? Just a thought...

  6. #6
    Join Date
    Apr 2007

    Re: Slow internet - Linux only

    I spent all of yesterday trying to fix my internet connection. I decided to reinstall Ubuntu using the alternate cd (I was pretty desperate). As always with reinstalling, I forgot to backup half my stuff, and I also found out that programs don't necessarily store ALL their preferences in ~/.program/ ...

    Anyhow, I managed to get fast ineternet speeds yesterday night! I had been googling all night and I tried pretty much every solution that I saw. I had fast internet! The keyword here is "had". This morning, when I booted up, I was back to my 250kbps. I went through my firefox history and retired every solution, and what do you know! I have fst internet again!

    I'm not sure which solution did it, and I'm not sure how I'm going to make sure I don't have to redo it every time I reboot. But I thought I'd post my findings here for everyone to see.

    1. - Disable IPv6
    I didn't have to redo this after my reboot.

    2. - Do some sysctl.conf magix

    sudo gedit /etc/sysctl.conf

    Scroll to the bottom and just add these lines to it.

    net.core.rmem_default = 524288
    net.core.rmem_max = 524288
    net.core.wmem_default = 524288
    net.core.wmem_max = 524288
    net.ipv4.tcp_wmem = 4096 87380 524288
    net.ipv4.tcp_rmem = 4096 87380 524288
    net.ipv4.tcp_mem = 524288 524288 524288
    net.ipv4.tcp_rfc1337 = 1
    net.ipv4.ip_no_pmtu_disc = 0
    net.ipv4.tcp_sack = 1
    net.ipv4.tcp_fack = 1
    net.ipv4.tcp_window_scaling = 1
    net.ipv4.tcp_timestamps = 1
    net.ipv4.tcp_ecn = 0
    net.ipv4.route.flush = 1

    run the sysctl to take effect.

    sudo sysctl -p
    The lines were still present in my configuration file, but I reran sysctl after reboot.

    3. - Do some iwconfig magix
    sudo iwconfig wlan0 rate 54M
    Reran that after reboot.


    I don't really know what I did and how exactly this fixed my internet speeds, but I'm thankful I hope this helps someone.

    It's the third step that boosts my internet to great speeds, I found out after some testing. How can I make it so that that command (with sudo) runs ate very startup?
    Last edited by robz0rz; June 20th, 2008 at 07:33 AM.

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