Re: bltk-game regressions on snb laptop

[Alex Shi <alex.shi@intel.com>]

On 04/18/2013 12:34 AM, Rafael J. Wysocki wrote:
> On Tuesday, April 16, 2013 03:14:31 PM Alex Shi wrote:
>> LKP found a performance and performance/watt regression on commit
>> aa77a52764a92216b61, acpi-cpufreq: Don't set policy->related_cpus from
>> .init.
>>
>> The commit removed the related_cpus setting, plus Our laptop has no
>> coordinate type setting in BIOS. So the related_cpus is only include the
>> cpu self, then the policy->cpus are impacted and only has self too.
>>
>> With ondemand governor, the bad commit cause bltk-game benchmark drop to
>> 18fps from 50fps, the performance/watt value also dropped a lot.
>> bltk-game runs 9 thread on the 4core*HT laptop.
>>
>> As Arjan and Len mentioned, the commit is correct in logical,
>> policy->cpus should only include the cpu self.
>> So I don't know where is the problem, maybe ondemand or some place
>> others. Anyway, I just report the issue to you.
> 
> Have you verified that reverting the commit in question causes the problem to
> go away?

yes, after revert, the fps is back to about 50fps from 18fps.
> 
> Rafael
> 
> 


-- 
Thanks Alex