You can verify the Linux networking kernel parms from the root user with these commands::
$ sysctl –a|grep rmem
$ sysctl –a|grep wmem
The Linux networking kernel parms files are located:
/proc/sys/net/core
rmem_default wmem_max rmem_max wmem_default
/proc/sys/net/ipv4
tcp_rmem tcp_wmem
The Linux networking kernel settings for 10gR2 are:
rmem_default
262144
/proc/sys/net/core/rmem_default
rmem_max
262144
/proc/sys/net/core/rmem_max
wmem_default
262144
/proc/sys/net/core/wmem_default
wmem_max
262144
/proc/sys/net/core/wmem_max
tcp_rmem
4096 87380 8388608
/proc/sys/net/ipv4/tcp_rmem
tcp_wmem
4096 65536 8388608
/proc/sys/net/ipv4/tcp_wmem
tcp_mem
4096 4096 4096
/proc/sys/net/ipv4/tcp_mem
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
