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Optimizing Linux network TCP/IP kernel parameters

Oracle Database Tips by Donald Burleson

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:

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


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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