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xen-devel
Re: [Xen-devel] Power aware credit scheduler
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To: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Power aware credit scheduler |
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From: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Date: |
Thu, 19 Jun 2008 09:09:30 +0100 |
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Cc: |
ackaouy@xxxxxxxxx, "Wei, Gang" <gang.wei@xxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx> |
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Thu, 19 Jun 2008 01:08:56 -0700 |
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[Xen-devel] Power aware credit scheduler |
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On 19/6/08 09:03, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:
>> Does it then make sense to have the scheduler react to
>> governor? Sounds like it could be a weird feedback loop.
>>
>
> Good suggestion. We're considering adding some more inputs from
> key components into on-demand governor, instead of simply polling
> busy ratio for freq change in a fixed interval. For example, when one
> cpu pulls vcpu from other runqueues, it's the indicator that its current
> freq may not fit and it's better to scale to max immediately instead
> of waiting for next 20ms check timer. Other indicators like interrupt,
> event, etc. You kick a good instance. :-)
I see. This specific example doesn't sound unreasonable. I suppose
experimental data will show what works and what doesn't.
-- Keir
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