linux-kernel - Re: [PATCH 0/4] ksm - dynamic page sharing driver for linux

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Date:	Tue, 11 Nov 2008 11:20:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Izik Eidus <ieidus@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kvm@...r.kernel.org, aarcange@...hat.com, chrisw@...hat.com,
	avi@...hat.com
Subject: Re: [PATCH 0/4] ksm - dynamic page sharing driver for linux

On Tue, 11 Nov 2008 21:07:10 +0200
Izik Eidus <ieidus@...hat.com> wrote:

> we have used KSM in production for about half year and the numbers that 
> came from our QA is:
> using KSM for desktop (KSM was tested just for windows desktop workload) 
> you can run as many as
> 52 windows xp with 1 giga ram each on server with just 16giga ram. (this 
> is more than 300% overcommit)
> the reason is that most of the kernel/dlls of this guests is shared and 
> in addition we are sharing the windows zero
> (windows keep making all its free memory as zero, so every time windows 
> release memory we take the page back to the host)
> there is slide that give this numbers you can find at:
> http://kvm.qumranet.com/kvmwiki/KvmForum2008?action=AttachFile&do=get&target=kdf2008_3.pdf 
> (slide 27)
> beside more i gave presentation about ksm that can be found at:
> http://kvm.qumranet.com/kvmwiki/KvmForum2008?action=AttachFile&do=get&target=kdf2008_12.pdf

OK, 300% isn't chicken feed.

It is quite important that information such as this be prepared, added to
the patch changelogs and maintained.  For a start, without this basic
information, there is no reason for anyone to look at any of the code!
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