Re: [discussion]sched: a rough proposal to enable power saving inscheduler

[Alex Shi]

On 08/20/2012 11:47 PM, Vincent Guittot wrote:

> On 16 August 2012 07:03, Alex Shi <alex.shi@xxxxxxxxx> wrote:
>> On 08/16/2012 12:19 AM, Matthew Garrett wrote:
>>
>>> On Mon, Aug 13, 2012 at 08:21:00PM +0800, Alex Shi wrote:
>>>
>>>> power aware scheduling), this proposal will adopt the
>>>> sched_balance_policy concept and use 2 kind of policy: performance, power.
>>>
>>> Are there workloads in which "power" might provide more performance than
>>> "performance"? If so, don't use these terms.
>>>
>>
>>
>> Power scheme should no chance has better performance in design.
> 
> A side effect of packing small tasks on one core is that you always
> use the core with the lowest C-state which will minimize the wake up
> latency so you can sometime get better results than performance mode
> which will try to use a other core in another cluster which will take
> more time to wake up that waiting for the end of the current task.
> 


Sure. some scenario packing tasks into smaller domain will bring
performance benefit.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/