From: Dario Faggioli <dario.faggioli@citrix.com>
To: Sisu Xi <xisisu@gmail.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>,
Meng Xu <xumengpanda@gmail.com>,
xen-devel <xen-devel@lists.xen.org>
Subject: Re: memory performance 20% degradation in DomU -- Sisu
Date: Wed, 12 Mar 2014 09:59:30 +0100 [thread overview]
Message-ID: <1394614770.31942.52.camel@Abyss> (raw)
In-Reply-To: <CAPqOm-qUfvQ0=DNSrg89noj=biUNtw_BmjCu_pANK0Q_HoAMuQ@mail.gmail.com>
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On Tue, 2014-03-11 at 10:46 -0500, Sisu Xi wrote:
> Can you be more specific about the highest performance modes of the
> CPU? For all the experiments, I disabled hyperthreading and frequency
> scaling, so CPU should work at a constant speed.
>
It was about TurboBoost (or whatever it's called) mode:
http://en.wikipedia.org/wiki/Intel_Turbo_Boost
Some more info on this old blog post:
http://blog.xen.org/index.php/2011/11/29/baremetal-vs-xen-vs-kvm-redux/
If you're completely disabling cpufreq via BIOS, I'd say this is ruled
out, but I can't be 100% sure. Also, that should be fixed in recent
enough Xen and Dom0 kernel.
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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prev parent reply other threads:[~2014-03-12 8:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-04 22:49 memory performance 20% degradation in DomU -- Sisu Sisu Xi
2014-03-04 23:00 ` Sisu Xi
2014-03-05 17:33 ` Konrad Rzeszutek Wilk
2014-03-05 20:09 ` Sisu Xi
2014-03-05 21:29 ` Gordan Bobic
2014-03-05 22:28 ` Konrad Rzeszutek Wilk
2014-03-06 10:31 ` Gordan Bobic
2014-03-05 22:09 ` Konrad Rzeszutek Wilk
2014-03-11 12:03 ` George Dunlap
2014-03-11 15:46 ` Sisu Xi
2014-03-11 20:21 ` Sisu Xi
2014-03-12 8:55 ` Dario Faggioli
2014-03-12 16:50 ` Sisu Xi
2014-03-13 10:25 ` George Dunlap
2014-03-12 8:59 ` Dario Faggioli [this message]
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