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  salvianoleao

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• 05 Jul 11
  

  Andras Nagy

  mtu tcp ip tweak sysctl

• 27 Aug 10
  

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  linux tcp network tuning

• 03 Apr 10
  

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  Winnu Ayi Satria

  linux tcp network performance tuning tweaks

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• 11 Aug 08
  

  Ron Hale-Evans

  a small snippet (not an authoritative guide or HOW-TO) on how to tweak Linux for broadband

  linux internet networking performance broadband

• 01 Mar 08
  

  Djiezes Kraaijst

  broadband config help howto internet linux network settings tweak

  • "How do I tweak Linux for broadband?"
  • This document applies to kernel   2.4.x, and will also work on the 2.6.x kernel provided it is compiled with /proc file system support enabled
  • RWIN (Receive WINdow) value
  • in the "Linux World" this value is dynamic
  • Typically, you will notice that your connection is actually slower than the default settings if your  window size is too big.   That being said, you should try out different size window sizes and see what  works best for you--but, in most cases either 512 KB, 256 KB, or 128 KB seem to do the trick quite nicely.

  • where these settings actually reside and what they mean.    The first set of four are located in /proc/sys/net/core.   They are:

      
     
    1. rmem_default - Receive Window default value
     
    2. rmem_max - Receive Window maximum value
     
    3. wmem_default - Send Window default value
     
    4. wmem_max - Send Window maximum value
  • The second set of eleven are located in /proc/sys/net/ipv4.

  • add the following to /etc/sysctl.conf (substituting your window size in  place of 524288, if necessary):

      

      # Tweaks for faster broadband...
      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

      

    Then to have the settings take effect immediately, run:

      

    sysctl -p

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