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SubjectRe: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()
On 01/23/2013 05:18 PM, Mike Galbraith wrote:
> On Wed, 2013-01-23 at 17:00 +0800, Michael Wang wrote:
>> On 01/23/2013 04:49 PM, Mike Galbraith wrote:
>>> On Wed, 2013-01-23 at 16:30 +0800, Michael Wang wrote:
>>>> On 01/23/2013 04:20 PM, Mike Galbraith wrote:
>>>>> On Wed, 2013-01-23 at 15:10 +0800, Michael Wang wrote:
>>>>>> On 01/23/2013 02:28 PM, Mike Galbraith wrote:
>>>>>
>>>>>>> Abbreviated test run:
>>>>>>> Tasks jobs/min jti jobs/min/task real cpu
>>>>>>> 640 158044.01 81 246.9438 24.54 577.66 Wed Jan 23 07:14:33 2013
>>>>>>> 1280 50434.33 39 39.4018 153.80 5737.57 Wed Jan 23 07:17:07 2013
>>>>>>> 2560 47214.07 34 18.4430 328.58 12715.56 Wed Jan 23 07:22:36 2013
>>>>>>
>>>>>> So still not works... and not going to balance path while waking up will
>>>>>> fix it, looks like that's the only choice if no error on balance path
>>>>>> could be found...benchmark wins again, I'm feeling bad...
>>>>>>
>>>>>> I will conclude the info we collected and make a v3 later.
>>>>>
>>>>> FWIW, I hacked virgin to do full balance if an idle CPU was not found,
>>>>> leaving the preference to wake cache affine intact though, turned on
>>>>> WAKE_BALANCE in all domains, and it did not collapse. In fact, the high
>>>>> load end, where the idle search will frequently be a waste of cycles,
>>>>> actually improved a bit. Things that make ya go hmmm.
>>>>
>>>> Oh, does that means the old balance path is good while the new is really
>>>> broken, I mean, compared this with the previously results, could we say
>>>> that all the collapse was just caused by the change of balance path?
>>>
>>> That's a good supposition. I'll see if it holds.
>>
>> I just notice that there is no sd support the WAKE flag at all according
>> to your debug info, isn't it?
>
> There is, I turned it on in all domains.

So is the debug info show the changes? May be I missed some timing which
need to rebuild the sbm.

Regards,
Michael Wang

>
> -Mike
>



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