[libvirt-users] Amount CPU's

Dominique Ramaekers dominique.ramaekers at cometal.be
Thu Feb 18 09:40:13 UTC 2016

Ok. I'll do some tests...

Thanks for the input.

> -----Oorspronkelijk bericht-----
> Van: Martin Kletzander [mailto:mkletzan at redhat.com]
> Verzonden: donderdag 18 februari 2016 10:10
> Aan: Dominique Ramaekers
> CC: libvirt-ML
> Onderwerp: Re: [libvirt-users] Amount CPU's
> On Wed, Feb 17, 2016 at 07:14:33PM +0000, Dominique Ramaekers wrote:
> >Quick question.
> >
> >In my host, I've got two processors with each 6 cores and each core has
> >two threads.
> >
> >I use iometer to do some testings on hard drive performance.
> >
> >I get the idea that using more cores give me better results in iometer.
> >(if it will improve the speed of my guest is an other
> >question...)
> >
> >For a Windows 2012 R2 server guest, can I just give the guest 24 cores?
> >Just to make shure the os has all the possibilities to run as quickly
> >as possible?
> >
> I don't know about Windows, especially not about 2012 R2, whatever that is =)
> But I remember that with some version, you had to supply it as separate
> sockets (e.g. <topology sockets='24' cores='1' threads='1'/>), but I'm not sure
> what version was that.
> Anyway, you should be able to provide all the CPUs to the guest, however bear
> in mind that the host will need some processing power as well, so the best
> practice is to keep some CPU power for the host.  If you need as much power as
> possible, make sure you use all the tuning (pinning,
> backing) that's available for you [1] and benchmark the performance.
> Martin
> [1] https://libvirt.org/formatdomain.html

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