From: George Dunlap <george.dunlap@eu.citrix.com>
To: Sisu Xi <xisisu@gmail.com>
Cc: Dario Faggioli <dario.faggioli@citrix.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: VCPU migration overhead conpensation ?
Date: Wed, 10 Apr 2013 09:21:17 +0100 [thread overview]
Message-ID: <516520FD.6020100@eu.citrix.com> (raw)
In-Reply-To: <CAPqOm-pxX+qoZEovjXPztmUYFm7EUA+fhUMpwOy98XppHMmRXA@mail.gmail.com>
(BTW, please don't top-post on xen-devel: respond in-line to the thing
you want to respond to.)
On 10/04/13 06:44, Sisu Xi wrote:
> Hi, Dario:
>
> Thanks for your reply and tips for sending emails! :)
>
> I am also performing some overhead measurement for the scheduler. If a
> VCPU is migrated from one core to another, the overhead is around 2
> microseconds on my machine, which is much less than what is set in
> Credit2 (50 microseconds).
When you say "overhead", I assume you mean that's how long the whole
migration takes?
The point of the compensation isn't so much for the actual migration
itself, but for the lower performance the vcpu will get after the
migration due to having cold caches.
-George
next prev parent reply other threads:[~2013-04-10 8:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-29 21:16 VCPU migration overhead conpensation ? Sisu Xi
2013-04-09 1:46 ` Dario Faggioli
2013-04-10 5:44 ` Sisu Xi
2013-04-10 6:53 ` Dario Faggioli
2013-04-10 8:21 ` George Dunlap [this message]
2013-04-10 8:25 ` Dario Faggioli
2013-04-10 18:58 ` Sisu Xi
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