From: Zhigang Wang <zhigang.x.wang@oracle.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: Tim Deegan <Tim.Deegan@eu.citrix.com>,
George Dunlap <dunlapg@umich.edu>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Juergen Gross <juergen.gross@ts.fujitsu.com>
Subject: Re: Cpu pools discussion
Date: Wed, 29 Jul 2009 08:29:43 +0800 [thread overview]
Message-ID: <4A6F97F7.3080303@oracle.com> (raw)
In-Reply-To: <C694DC8E.10D23%keir.fraser@eu.citrix.com>
Keir Fraser wrote:
> On 28/07/2009 16:29, "Dan Magenheimer" <dan.magenheimer@oracle.com> wrote:
>
>> Currently this is done with pinning, but pinning
>> does restrict the flexibility of a multi-vcpu VM.
>> Affinity seems like it should help, but affinity
>> doesn't restrict the VM from running on a non-affinitive
>> pcpu (does it?)
>
> Yes it does. VCPUs only run on PCPUs in their affinity masks.
>
> -- Keir
>
>
I'm wondering is there some performance difference between these
two scenario:
1) vcpu0 pinned to pcpu0, vcpu1 pinned to pcpu1.
2) vcpu0 and vcpu1 affined to pcpu0 and pcpu1 but not pinned.
Currently we have to explicitly pin *every* vcpu to get true hard partitioning.
We are seeking for a better solution, whether it will be in the hypervisor or just
user space tools. But seems the cpu pool concept is attractive.
thanks,
zhigang
next prev parent reply other threads:[~2009-07-29 0:29 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-27 15:20 Cpu pools discussion George Dunlap
2009-07-27 15:50 ` Keir Fraser
2009-07-28 0:41 ` Zhigang Wang
2009-07-28 9:19 ` Tim Deegan
2009-07-28 10:15 ` Juergen Gross
2009-07-28 12:50 ` George Dunlap
2009-07-28 13:07 ` Tim Deegan
2009-07-28 13:24 ` Juergen Gross
2009-07-28 13:31 ` Tim Deegan
2009-07-28 13:39 ` Juergen Gross
2009-07-28 13:47 ` George Dunlap
2009-07-28 13:57 ` Juergen Gross
2009-07-28 15:29 ` Dan Magenheimer
2009-07-28 15:49 ` Keir Fraser
2009-07-28 16:26 ` George Dunlap
2009-07-29 0:29 ` Zhigang Wang [this message]
2009-07-29 5:47 ` Juergen Gross
2009-07-28 13:41 ` George Dunlap
2009-07-28 13:55 ` Keir Fraser
2009-07-29 6:14 ` Juergen Gross
2009-07-29 7:39 ` Keir Fraser
2009-07-29 8:52 ` Juergen Gross
2009-07-29 9:35 ` Keir Fraser
2009-07-29 11:06 ` Juergen Gross
2009-07-29 12:28 ` Keir Fraser
2009-07-29 12:33 ` Juergen Gross
2009-07-29 13:00 ` Keir Fraser
2009-07-30 5:46 ` Juergen Gross
2009-07-30 8:30 ` Keir Fraser
2009-07-30 8:58 ` Juergen Gross
2009-07-30 12:51 ` Juergen Gross
2009-07-30 13:18 ` Keir Fraser
2009-07-31 5:25 ` Juergen Gross
2009-07-28 5:40 ` Juergen Gross
2009-07-28 9:09 ` Keir Fraser
2009-07-28 10:19 ` Juergen Gross
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