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You can verify the Linux networking kernel parms from the root user with these commands::Many Oracle professionals do not note the required setting for optimizing Oracle*Net on Oracle 10g release 2. Here is a review of the suggested TCP/IP buffer parameters:
$ sysctl –a|grep rmem
$ sysctl –a|grep wmem
The Linux networking kernel parms files are located:
/proc/sys/net/corermem_defaultwmem_maxrmem_max wmem_default/proc/sys/net/ipv4
tcp_rmemtcp_wmem
The Linux networking kernel settings for 10gR2 are:
|
rmem_default |
262144 |
|
|
rmem_max |
262144 |
|
|
wmem_default |
262144 |
|
|
wmem_max |
262144 |
|
|
tcp_rmem |
4096 87380 8388608 |
|
|
tcp_wmem |
4096 65536 8388608 |
|
|
tcp_mem |
4096 4096 4096 |
|
Setting /etc/sysctl.conf
You can enter them in sysctl.conf in /etc to have them persist through shutdowns. For setting the live values use sysctl –w from the root user.
$ sysctl –w net.core.rmem_default=262144 <== no spaces
For multiple value entries:
$ sysctl –w net.ipv4.tcp_rmem="4096 87380 8388608"
In sysctl.conf:
net.core.rmem_default = 262144 <== has spaces
net.ipv4.tcp_rmem = 4096 87380 8388608
Optimizing Linux network TCP/IP kernel parameters
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原文地址：http://www.cnblogs.com/zengkefu/p/5635110.html
