From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: Performance of Xen VCPU Scheduling
Date: Wed, 10 Jul 2013 15:23:04 +0200
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To: Marcus Granado <marcus.granado@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>, Matthew Portas <matthew.portas@citrix.com>, xen-devel <xen-devel@lists.xensource.com>
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On mer, 2013-07-10 at 14:00 +0100, Marcus Granado wrote:
> Hello,
>=20
Hey!

> [...]
>
> While trying to understand why this increased performance is not present=
=20
> in the default non-pinned state and if it would be possible to obtain=20
> this extra performance in the default non-pinned dom0 configuration,=20
> Matthew Portas and I evaluated lots of Xen 4.2 parameters and patches:
>=20
> http://wiki.xenproject.org/wiki/Performance_of_Xen_VCPU_Scheduling
>=20
I've just glanced at it, and there's really a lot of data there! :-)=20

I'll have a seriously deep look in the next hours and will provide some
feedback about it... For now, let me thank you a lot for both doing and
sharing this (especially for putting it on the Wiki! :-D).

Just one point. This by any means make all this study/effort less
valuable (quite the contrary, actually), but, with George, we started to
discuss about bringing credit2 into a better shape and, at some point,
switch to it by default. It's unclear whether this could be done for
4.4, but still... So, do you have any numbers about it already? How hard
will it be to, at some point, perform the same measurements and analysis
with it?

Thanks again and Regards,
Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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