Difference between revisions of "TCP-Tuning"
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| − | = Performance | + | = 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 == |
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| − | + | The following are important for TCP tuning: | |
| − | * | + | * <code>net.ipv4.tcp_rmem</code> |
| − | * | + | * <code>net.ipv4.tcp_wmem</code> |
| − | * | + | * <code>net.core.rmem_default</code> |
| + | * <code>net.core.wmem_default</code> | ||
| + | * <code>net.core.rmem_max</code> | ||
| + | * <code>net.core.wmem_max</code> | ||
| + | * <code>net.ipv4.tcp_dsack</code> | ||
| + | * <code>net.ipv4.tcp_sack</code> | ||
| + | * <code>net.ipv4.tcp_timestamps</code> | ||
| + | * <code>net.core.netdev_max_backlog</code> | ||
| + | They can be modified with: | ||
| + | * Quattor ; | ||
| + | * YAIM ; | ||
| + | * Manually by modifying the <code>/etc/sysctl.conf</code> file. | ||
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| − | + | == Recommended values == | |
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| + | * <code>net.ipv4.tcp_rmem = 131072 1048576 2097152</code> | ||
| + | * <code>net.ipv4.tcp_wmem = 131072 1048576 2097152</code> | ||
| + | * <code>net.core.rmem_default = 1048576</code> | ||
| + | * <code>net.core.wmem_default = 1048576</code> | ||
| + | * <code>net.core.rmem_max = 2097152</code> | ||
| + | * <code>net.core.wmem_max = 2097152</code> | ||
| + | * <code>net.ipv4.tcp_dsack = 0</code> | ||
| + | * <code>net.ipv4.tcp_sack = 0</code> | ||
| + | * <code>net.ipv4.tcp_timestamps = 0</code> | ||
| + | * <code>net.core.netdev_max_backlog = 10000</code> | ||
| − | == | + | |
| + | == 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 | ||
Version du 14:20, 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.
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
