SGI Ethernet Card Guide de l'utilisateur télécharger pdf (Page 32)

4: Performance Tuning

sizes were chosen to be compatible with those recommended by the card

manufacturer and required by SGI’s software. To set the network buffer sizes:

1. Add or change the following entries in the /etc/sysctl.conf ﬁle:

net.core.rmem_default = 524287

net.core.rmem_max = 524287

net.core.wmem_default = 524287

net.core.wmem_max = 524287

net.ipv4.tcp_rmem = 10000000 10000000 16777216

net.ipv4.tcp_wmem = 10000000 10000000 16777216

net.ipv4.tcp_mem = 10000000 10000000 16777216

net.core.netdev_max_backlog = 300000

net.core.optmem_max = 524287

net.ipv4.tcp_timestamps = 1

net.ipv4.tcp_sack = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_tw_reuse = 1

2. Make the sizes take effect:

[root@linux root]# sysctl -p /etc/sysctl.conf

TCP Time Stamps

TCP time stamps are turned on by default to greatly reduce the chance of data

corruption at high throughput rates. Therefore, SGI strongly recommends their use.

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SGI Ethernet Card Guide de l'utilisateur Page 32