[CentOS-virt] Enabling KSM with ksmctl under Centos 5.4

Steven Ellis steven.ellis at bulletin.net
Thu Feb 11 04:23:53 UTC 2010

Are their any good guides out there on how to use ksmctl to enable and
tune KSM performance on Centos/RedHat

At the moment the only guidelines I can find are from the following OLS
paper, plus the Linux Kernel Docs.
 * http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf
 * http://www.kernel.org/doc/Documentation/vm/ksm.txt

On a basic dual core testbed with 4GB Ram and 4-5 VMs I've tried

  ksmctl  start 60 5000

This resulted in a 5% system cpu load as it tried to recover shared
space. Sadly I can't tell how well it is working as we don't have
/sys/kernel/mm/ksm support in Centos.

Has anyone got some guidelines on how to relate number of pages +
interval to number of CPUs and Ram.


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