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Date: Mon, 15 Jun 2020 15:26:59 +0800
From: Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To: Hillf Danton <hdanton@...a.com>
Cc: kernel test robot <rong.a.chen@...el.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Ingo Molnar <mingo@...nel.org>,
Mel Gorman <mgorman@...hsingularity.net>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Juri Lelli <juri.lelli@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Valentin Schneider <valentin.schneider@....com>,
Phil Auld <pauld@...hat.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [sched/fair] 070f5e860e: reaim.jobs_per_min -10.5%
regression
On 6/12/2020 7:06 PM, Hillf Danton wrote:
>
> On Fri, 12 Jun 2020 14:36:49 +0800 Xing Zhengjun wrote:
>> Hi Vincent,
>>
>> We test the regression still existed in v5.7, do you have time to
>> look at it? Thanks.
>>
>>
>> =========================================================================================
>> tbox_group/testcase/rootfs/kconfig/compiler/runtime/nr_task/debug-setup/test/cpufreq_governor/ucode:
>>
>> lkp-ivb-d04/reaim/debian-x86_64-20191114.cgz/x86_64-rhel-7.6/gcc-7/300s/100%/test/five_sec/performance/0x21
>>
>> commit:
>> 9f68395333ad7f5bfe2f83473fed363d4229f11c
>> 070f5e860ee2bf588c99ef7b4c202451faa48236
>> v5.7
>>
>> 9f68395333ad7f5b 070f5e860ee2bf588c99ef7b4c2 v5.7
>> ---------------- --------------------------- ---------------------------
>> %stddev %change %stddev %change %stddev
>> \ | \ | \
>> 0.69 -10.3% 0.62 -9.1% 0.62 reaim.child_systime
>> 0.62 -1.0% 0.61 +0.5% 0.62 reaim.child_utime
>> 66870 -10.0% 60187 -7.6% 61787 reaim.jobs_per_min
>> 16717 -10.0% 15046 -7.6% 15446 reaim.jobs_per_min_child
>> 97.84 -1.1% 96.75 -0.4% 97.43 reaim.jti
>> 72000 -10.8% 64216 -8.3% 66000 reaim.max_jobs_per_min
>> 0.36 +10.6% 0.40 +7.8% 0.39 reaim.parent_time
>> 1.58 ą 2% +71.0% 2.70 ą 2% +26.9% 2.01 ą 2% reaim.std_dev_percent
>> 0.00 ą 5% +110.4% 0.01 ą 3% +48.8% 0.01 ą 7% reaim.std_dev_time
>> 50800 -2.4% 49600 -1.6% 50000 reaim.workload
>>
>>
>> On 3/19/2020 10:38 AM, kernel test robot wrote:
>>> Greeting,
>>>
>>> FYI, we noticed a -10.5% regression of reaim.jobs_per_min due to commit:
>>>
>>>
>>> commit: 070f5e860ee2bf588c99ef7b4c202451faa48236 ("sched/fair: Take into account runnable_avg to classify group")
>>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>>>
>>> in testcase: reaim
>>> on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 4G memory
>>> with following parameters:
>>>
>>> runtime: 300s
>>> nr_task: 100%
>>> test: five_sec
>>> cpufreq_governor: performance
>>> ucode: 0x21
>>>
>>> test-description: REAIM is an updated and improved version of AIM 7 benchmark.
>>> test-url: https://sourceforge.net/projects/re-aim-7/
>
> Hi Xing
>
> After 070f5e860ee2 let's treat runnable the same way as util on
> comparing capacity in the assumption that
> (125 + 110 + 117) / 3 = 117 accounts for 105 within margin of error
> before any other proposal with some more reasons.
>
> thanks
> Hillf
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -8215,12 +8215,8 @@ group_has_capacity(unsigned int imbalanc
> if (sgs->sum_nr_running < sgs->group_weight)
> return true;
>
> - if ((sgs->group_capacity * imbalance_pct) <
> - (sgs->group_runnable * 100))
> - return false;
> -
> - if ((sgs->group_capacity * 100) >
> - (sgs->group_util * imbalance_pct))
> + if ((sgs->group_capacity * 100) > (sgs->group_util * imbalance_pct) &&
> + (sgs->group_capacity * 100) > (sgs->group_runnable * imbalance_pct))
> return true;
>
> return false;
> @@ -8240,12 +8236,8 @@ group_is_overloaded(unsigned int imbalan
> if (sgs->sum_nr_running <= sgs->group_weight)
> return false;
>
> - if ((sgs->group_capacity * 100) <
> - (sgs->group_util * imbalance_pct))
> - return true;
> -
> - if ((sgs->group_capacity * imbalance_pct) <
> - (sgs->group_runnable * 100))
> + if ((sgs->group_capacity * 100) < (sgs->group_util * imbalance_pct) ||
> + (sgs->group_capacity * 100) < (sgs->group_runnable * imbalance_pct))
> return true;
>
> return false;
>
I apply the patch based on v5.7, the regression still existed.
=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/runtime/nr_task/debug-setup/test/cpufreq_governor/ucode:
lkp-ivb-d04/reaim/debian-x86_64-20191114.cgz/x86_64-rhel-7.6/gcc-7/300s/100%/test/five_sec/performance/0x21
commit:
9f68395333ad7f5bfe2f83473fed363d4229f11c
070f5e860ee2bf588c99ef7b4c202451faa48236
v5.7
6b33257768b8dd3982054885ea310871be2cfe0b (Hillf's patch)
9f68395333ad7f5b 070f5e860ee2bf588c99ef7b4c2 v5.7
6b33257768b8dd3982054885ea3
---------------- --------------------------- ---------------------------
---------------------------
%stddev %change %stddev %change
%stddev %change %stddev
\ | \ | \
| \
0.69 -10.3% 0.62 -9.1% 0.62
-10.1% 0.62 reaim.child_systime
0.62 -1.0% 0.61 +0.5% 0.62
+0.3% 0.62 reaim.child_utime
66870 -10.0% 60187 -7.6% 61787
-8.3% 61305 reaim.jobs_per_min
16717 -10.0% 15046 -7.6% 15446
-8.3% 15326 reaim.jobs_per_min_child
97.84 -1.1% 96.75 -0.4% 97.43
-0.5% 97.37 reaim.jti
72000 -10.8% 64216 -8.3% 66000
-8.3% 66000 reaim.max_jobs_per_min
0.36 +10.6% 0.40 +7.8% 0.39
+9.4% 0.39 reaim.parent_time
1.58 ± 2% +71.0% 2.70 ± 2% +26.9% 2.01 ±
2% +33.2% 2.11 reaim.std_dev_percent
0.00 ± 5% +110.4% 0.01 ± 3% +48.8% 0.01 ±
7% +65.3% 0.01 ± 3% reaim.std_dev_time
50800 -2.4% 49600 -1.6% 50000
-1.8% 49866 reaim.workload
--
Zhengjun Xing
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