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xen-devel
RE: [Xen-devel] Power aware credit scheduler
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To: |
"Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] Power aware credit scheduler |
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From: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx> |
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Date: |
Thu, 19 Jun 2008 16:11:47 +0800 |
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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 01:12:39 -0700 |
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Thread-topic: |
[Xen-devel] Power aware credit scheduler |
>From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
>Sent: 2008年6月19日 16:10
>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.
>
Yes, and we'll start some experiment soon. Will let you know once we
get some concrete data.
Thanks,
Kevin
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