Re: KSM with Debian GNU/Linux

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi, all!

On Thursday, 12 August 2010 22:05:34 -0300,
Daniel Bareiro wrote:

> Keeping the kernel I had compiled and installing the qemu-kvm package
> in Backports, now KSM is working:
> 
> # cat /sys/kernel/mm/ksm/pages_sharing
> 181406

Looking at the statistics of the values obtained running 15 virtual
machines totaling 10.7 GB on a 4 GB VMHost, I get the following, which
is a very interesting memory savings:

# for ii in /sys/kernel/mm/ksm/* ; do echo -n "$ii: " ; cat $ii ; done
/sys/kernel/mm/ksm/full_scans: 4114
/sys/kernel/mm/ksm/max_kernel_pages: 253500
/sys/kernel/mm/ksm/pages_shared: 67064
/sys/kernel/mm/ksm/pages_sharing: 510990
/sys/kernel/mm/ksm/pages_to_scan: 100
/sys/kernel/mm/ksm/pages_unshared: 448079
/sys/kernel/mm/ksm/pages_volatile: 13595
/sys/kernel/mm/ksm/run: 1
/sys/kernel/mm/ksm/sleep_millisecs: 20

# free
             total       used       free     shared    buffers     cached
Mem:       4056468    2578728    1477740          0       3736      62156
-/+ buffers/cache:    2512836    1543632
Swap:       497848      25972     471876


Some recommendation about tunning of KSM?

I've no very clear about the difference between page_shared and
page_sharing. Somebody could clarify it?

Thanks for your reply.

Regards,
Daniel
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