TCP-Tuning

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TCP Performance

This page describes how to enhance the performance of data transfers. It mainly focus on the optimization of the Linux kernel parameters.

Kernel parameters

The following are important for TCP tuning:

  • net.ipv4.tcp_rmem
  • net.ipv4.tcp_wmem
  • net.core.rmem_default
  • net.core.wmem_default
  • net.core.rmem_max
  • net.core.wmem_max
  • net.ipv4.tcp_dsack
  • net.ipv4.tcp_sack
  • net.ipv4.tcp_timestamps
  • net.core.netdev_max_backlog

They can be modified with:

  • Quattor ;
  • YAIM ;
  • Manually by modifying the /etc/sysctl.conf file.


Recommended values

  • net.ipv4.tcp_rmem = 131072 1048576 2097152
  • net.ipv4.tcp_wmem = 131072 1048576 2097152
  • net.core.rmem_default = 1048576
  • net.core.wmem_default = 1048576
  • net.core.rmem_max = 2097152
  • net.core.wmem_max = 2097152
  • net.ipv4.tcp_dsack = 0
  • net.ipv4.tcp_sack = 0
  • net.ipv4.tcp_timestamps = 0
  • net.core.netdev_max_backlog = 10000


External links

Récupérée de « https://lcg.in2p3.fr/index.php?title=TCP-Tuning&oldid=5781 »