| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
Re: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen
|
To: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Shan, Haitao" <haitao.shan@xxxxxxxxx>, Haitao Shan <maillists.shan@xxxxxxxxx> |
|
Subject: |
Re: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen |
|
From: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|
Date: |
Fri, 12 Sep 2008 07:02:27 +0100 |
|
Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, "Wei, Gang" <gang.wei@xxxxxxxxx> |
|
Delivery-date: |
Thu, 11 Sep 2008 23:02:22 -0700 |
|
Envelope-to: |
www-data@xxxxxxxxxxxxxxxxxxx |
|
In-reply-to: |
<D470B4E54465E3469E2ABBC5AFAC390F024D97B8@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
|
List-help: |
<mailto:xen-devel-request@lists.xensource.com?subject=help> |
|
List-id: |
Xen developer discussion <xen-devel.lists.xensource.com> |
|
List-post: |
<mailto:xen-devel@lists.xensource.com> |
|
List-subscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
|
List-unsubscribe: |
<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
|
Sender: |
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
|
Thread-index: |
AckUfmQ24tRMYhhpRsGES1HI8UlxdAAHr3OH |
|
Thread-topic: |
[Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen |
|
User-agent: |
Microsoft-Entourage/11.4.0.080122 |
On 12/9/08 03:22, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:
>> I consider this might be a nice win for possibly less effort than is
> being
>> expended in trying to make idle residency times (and hence Cx
> residency
>> times) as long as possible.
>>
>
> These two don't conflict. Cpu online/offline can't be used in small
> interval due
> to long latency and added overhead to whole system, but it makes sense
> when administrator realizes low cpu utilization in a relatively long
> period like
> in hrs. Current idle governor instead runs in fine-grained level to fit
> the otherwise
> cases.
I certainly agree with that. Just pointing out that, with the fine-graiend
approach, beyond a certain point you'll be investing effort for smaller and
smaller further gains.
-- Keir
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home