Re: [LKP] [lkp-developer] [sched/fair] 4e5160766f: +149% ftq.noise.50% regression
From: Vincent Guittot
Date: Tue Feb 28 2017 - 05:45:25 EST
On 28 February 2017 at 01:33, Huang, Ying <ying.huang@xxxxxxxxx> wrote:
> Vincent Guittot <vincent.guittot@xxxxxxxxxx> writes:
>
>> Hi Ying,
>>
>> On 21 February 2017 at 03:40, Huang, Ying <ying.huang@xxxxxxxxx> wrote:
>>> Hi, Vincent,
>>>
>>> Vincent Guittot <vincent.guittot@xxxxxxxxxx> writes:
>>>
>>
>> [snip]
>>
>>>>>
>>>>> Here is the test result,
>>>>>
>>>>> =========================================================================================
>>>>> compiler/cpufreq_governor/freq/kconfig/nr_task/rootfs/samples/tbox_group/test/testcase:
>>>>> gcc-6/powersave/20/x86_64-rhel-7.2/100%/debian-x86_64-2016-08-31.cgz/6000ss/lkp-hsw-d01/cache/ftq
>>>>>
>>>>> commit:
>>>>> 4e5160766fcc9f41bbd38bac11f92dce993644aa: first bad commit
>>>>> 09a43ace1f986b003c118fdf6ddf1fd685692d49: parent of first bad commit
>>>>> b524060933c546fd2410c5a09360ba23a0fef846: with fix patch above
>>>>>
>>>>> 4e5160766fcc9f41 09a43ace1f986b003c118fdf6d b524060933c546fd2410c5a093
>>>>> ---------------- -------------------------- --------------------------
>>>>> %stddev %change %stddev %change %stddev
>>>>> \ | \ | \
>>>>> 3463 Â 10% -61.4% 1335 Â 17% -3.0% 3359 Â 2% ftq.noise.50%
>>>>> 1116 Â 23% -73.7% 293.90 Â 30% -23.8% 850.69 Â 17% ftq.noise.75%
>>>>
>>>> To be honest, I was expecting at least the same level of improvement
>>>> as the previous patch if not better but i was not expecting worse
>>>> results
>>>
>>> What's your next plan for this regression? At least your previous patch
>>> could recover part of it.
>>
>> I haven't been able to find better fix than the previous patch so i'm
>> going to send a clean version with proper commit message
>
> Great to know this. Could you keep me posted?
Yes for sure
>
> Best Regards,
> Huang, Ying
>
>> Regards,
>> Vincent
>>
>>>
>>> Best Regards,
>>> Huang, Ying