TCP-Tuning: Difference between revisions
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This page describes how to enhance the performance of data transfers. It mainly focus on the optimization of the Linux kernel parameters. | This page describes how to enhance the performance of data transfers. It mainly focus on the optimization of the Linux kernel parameters. | ||
== Quattor == | |||
The [http://lcg.in2p3.fr/wiki/index.php/Image:Quattor_tcp_tuning.pdf Quattor TCP Tuning] guide aims to be a good documentation for helping you tuning your TCP Performance with Quattor. | |||
== Kernel parameters == | == Kernel parameters == | ||
Version du 14:25, 8 avril 2010
TCP Performance
This page describes how to enhance the performance of data transfers. It mainly focus on the optimization of the Linux kernel parameters.
Quattor
The Quattor TCP Tuning guide aims to be a good documentation for helping you tuning your TCP Performance with Quattor.
Kernel parameters
The following are important for TCP tuning:
net.ipv4.tcp_rmemnet.ipv4.tcp_wmemnet.core.rmem_defaultnet.core.wmem_defaultnet.core.rmem_maxnet.core.wmem_maxnet.ipv4.tcp_dsacknet.ipv4.tcp_sacknet.ipv4.tcp_timestampsnet.core.netdev_max_backlog
They can be modified with:
- Quattor ;
- YAIM ;
- Manually by modifying the
/etc/sysctl.conffile.
Recommended values
net.ipv4.tcp_rmem = 131072 1048576 2097152net.ipv4.tcp_wmem = 131072 1048576 2097152net.core.rmem_default = 1048576net.core.wmem_default = 1048576net.core.rmem_max = 2097152net.core.wmem_max = 2097152net.ipv4.tcp_dsack = 0net.ipv4.tcp_sack = 0net.ipv4.tcp_timestamps = 0net.core.netdev_max_backlog = 10000
External links
- http://fasterdata.es.net/
- http://monalisa.cern.ch/FDT/documentation_syssettings.html
- http://indico.cern.ch/contributionDisplay.py?sessionId=31&contribId=55&confId=61917
- http://www.psc.edu/networking/projects/tcptune/
- http://onlamp.com/pub/a/onlamp/2005/11/17/tcp_tuning.html
- http://en.wikipedia.org/wiki/TCP_tuning