From: Gianluca Guida <gianluca.guida@eu.citrix.com>
To: deshantm@gmail.com
Cc: Muli Ben-Yehuda <MULI@il.ibm.com>,
Anthony Liguori <aliguori@us.ibm.com>,
xen-devel mailing list <xen-devel@lists.xensource.com>
Subject: Re: Re: Poor performance on HVM (kernbench)
Date: Thu, 11 Sep 2008 11:00:40 +0100 [thread overview]
Message-ID: <48C8EC48.6080507@eu.citrix.com> (raw)
In-Reply-To: <1e16a9ed0809101422p6a58304dxaa1a92847109a518@mail.gmail.com>
Todd Deshane wrote:
> Xen 3.3 should be an improvement with shadow3 right?
As other people already said, shadow3 (especially the current unsync
policy) was mostly developed with Windows performance in mind. I would
be surprised if the shadow algorithm is causing such a performance loss
though; but in any case, you can disable the out-of-sync feature by
removing SHOPT_OUT_OF_SYNC from SHADOW_OPTIMIZATIONS in
xen/arch/x86/mm/shadows/private.h (setting it to 0xff instead of 0x1ff),
reverting the shadow code back to shadow 2 again.
Can you please test that and see if it makes any difference?
Thanks,
Gianluca
>
> Should I need to adjust the shadow_memory parameter for the guest?
>
> I'm going to try Xen 3.2.1 from source next.
>
> Todd
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2008-09-11 10:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-10 18:23 Poor performance on HVM (kernbench) Todd Deshane
2008-09-10 21:22 ` Todd Deshane
2008-09-10 22:42 ` Anthony Liguori
2008-09-11 2:52 ` Todd Deshane
2008-09-11 9:35 ` George Dunlap
2008-09-11 15:30 ` Todd Deshane
2008-09-11 10:00 ` Gianluca Guida [this message]
2008-09-11 15:17 ` Gianluca Guida
2008-09-11 15:25 ` Gianluca Guida
2008-09-11 15:35 ` Todd Deshane
2008-09-11 16:48 ` Gianluca Guida
2008-09-11 17:25 ` Gianluca Guida
2008-09-11 18:07 ` George Dunlap
2008-09-11 18:26 ` Gianluca Guida
2008-09-11 19:04 ` Todd Deshane
2008-09-11 19:54 ` Todd Deshane
2008-09-11 20:02 ` Jeremy Fitzhardinge
2008-09-11 20:24 ` John Levon
2008-09-12 10:41 ` Gianluca Guida
2008-09-12 11:04 ` George Dunlap
2008-09-12 11:19 ` George Dunlap
2008-09-12 14:20 ` Jeremy Fitzhardinge
2008-09-10 21:37 ` Daniel Magenheimer
2008-09-10 21:42 ` Todd Deshane
2008-09-10 21:45 ` Daniel Magenheimer
2008-09-11 2:48 ` Todd Deshane
2008-09-10 21:51 ` Steve Ofsthun
2008-09-11 2:50 ` Todd Deshane
2008-09-11 6:31 ` Pasi Kärkkäinen
2008-09-11 16:02 ` Todd Deshane
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