3.5.1 Matrix Server Administration Guide

Chapter 8: Configure MxFS-Linux 174

Adjust the NIC Parameters

To set the NIC parameters, you will need to add commands to the

appropriate file for your operating system, as described below. The files

are executed after the system is booted, specifically after all run-level

scripts are completed.

• On RHEL4 systems, add the commands to the /etc/rc.local file. This file

is typically created when the OS is installed.

• On SLES9 systems, add the commands to the /etc/after.local file. You

may need to create this file.

The commands to modify the parameters are as follows. To change the

parameters in real time, execute the commands on the command line.

• Disable Ethernet flow control:

ethtool -A eth0 tx off rx off

• Disable the TSO feature:

ethtool -K eth0 tso off

• Increase the size of the NIC transmit queue on a per-interface basis:

# ip link set eth0 txqueuelen 3000

After adjusting the NIC values, it is a good idea to check the NIC statistics

with the ethtool -S command.

Tuning References

The following “nfs-howto” document is very helpful:

http://nfs.sourceforge.net/nfs-howto/

Another good document on NFS performance tuning is located at:

http://www.tldp.org/HOWTO/NFS-HOWTO/performance.html