From: David Martin <david@lsbase.com>
To: kvm@vger.kernel.org
Cc: berni@berkenwald.de
Subject: Re: hugetlbfs and KSM
Date: Thu, 8 Apr 2010 14:36:47 -0500 (CDT) [thread overview]
Message-ID: <2131463606.2172.1270755407668.JavaMail.root@mail1.martinsales.net> (raw)
In-Reply-To: <579435996.2170.1270755367936.JavaMail.root@mail1.martinsales.net>
I asked this question quite a while ago, it seems huge pages do not get scanned for merging.
David Martin
----- "Bernhard Schmidt" <berni@birkenwald.de> wrote:
> Hi,
>
> running Debian Squeeze with a 2.6.32-3-amd64 kernel and qemu-kvm
> 0.12.3
> I enabled hugetlbfs on a rather small box with about five similar VMs
> today (all Debian Squeeze amd64, but different services)
>
> Pro:
> * system load on the host has gone way down (by about 50%)
>
> Contra:
> * KSM seems to be largely ineffective (100MB saved -> 1.3MB saved)
>
> Am I doing something wrong? Is this a bug? Is this generally
> impossible
> with large pages (which might explain the lower load on the host, if
> large pages are not scanned)? Or is it just way less likely to have
> identical pages at that size?
>
> Bernhard
>
> --
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next parent reply other threads:[~2010-04-08 19:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <579435996.2170.1270755367936.JavaMail.root@mail1.martinsales.net>
2010-04-08 19:36 ` David Martin [this message]
2010-04-08 19:29 hugetlbfs and KSM Bernhard Schmidt
2010-04-09 20:03 ` Chris Wright
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