linux-kernel - Re: [Intel-gfx] [drm/i915/gem] 59dd13ad31: phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per

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Date:   Fri, 27 Nov 2020 09:51:41 +0800
From:   Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Oliver Sang <oliver.sang@...el.com>
Cc:     feng.tang@...el.com, tiejun.li@...el.com, guangli.li@...el.com,
        frank.du@...el.com, guobing.chen@...el.com, jiebin.sun@...el.com,
        Shuhua.Fan@...el.com, Matthew Auld <matthew.auld@...el.com>,
        fan.zhao@...el.com, ying.huang@...el.com, shan.kang@...el.com,
        zhengjun.xing@...el.com, Wenhuan.Huang@...el.com,
        intel-gfx@...ts.freedesktop.org, lkp@...ts.01.org,
        ming.a.chen@...el.com, yu.ma@...el.com, jessica.ji@...el.com,
        dapeng1.mi@...el.com, wangyang.guo@...el.com,
        LKML <linux-kernel@...r.kernel.org>, gengxin.xie@...el.com
Subject: Re: [Intel-gfx] [drm/i915/gem] 59dd13ad31:
 phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second
 -54.0% regression



On 11/27/2020 5:34 AM, Chris Wilson wrote:
> Quoting Xing Zhengjun (2020-11-26 01:44:55)
>>
>>
>> On 11/25/2020 4:47 AM, Chris Wilson wrote:
>>> Quoting Oliver Sang (2020-11-19 07:20:18)
>>>> On Fri, Nov 13, 2020 at 04:27:13PM +0200, Joonas Lahtinen wrote:
>>>>> Hi,
>>>>>
>>>>> Could you add intel-gfx@...ts.freedesktop.org into reports going
>>>>> forward.
>>>>>
>>>>> Quoting kernel test robot (2020-11-11 17:58:11)
>>>>>>
>>>>>> Greeting,
>>>>>>
>>>>>> FYI, we noticed a -54.0% regression of phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second due to commit:
>>>>>
>>>>> How many runs are there on the bad version to ensure the bisect is
>>>>> repeatable?
>>>>
>>>> test 4 times.
>>>> zxing@inn:/result/phoronix-test-suite/performance-true-Radial_Gradient_Paint-1024x1024-jxrendermark-1.2.4-ucode=0xd6-monitor=da39a3ee/lkp-cfl-d1/debian-x86_64-phoronix/x86_64-rhel-8.3/gcc-9/59dd13ad310793757e34afa489dd6fc8544fc3da$ grep -r "operations_per_second" */stats.json
>>>> 0/stats.json: "phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second": 4133.487932,
>>>> 1/stats.json: "phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second": 4120.421503,
>>>> 2/stats.json: "phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second": 4188.414835,
>>>> 3/stats.json: "phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second": 4068.549514,
>>>
>>> a w/o revert (drm-tip)
>>> b w/ revert
>>> +mB----------------------------------------------------------------------------+
>>> |                             ..b                                              |
>>> |                             ..b.aa                                           |
>>> |                             ....a.a                                          |
>>> |                             ....a.a                                          |
>>> |                      b  b  ........a                                         |
>>> |                   b  b  b b......... a                                       |
>>> |                   b  bb bbb...........                                       |
>>> |b               ab bbab.bb.b............ba b a a            ab               a|
>>> |                             |__A__|                                          |
>>> |                             |MA_|                                            |
>>> +------------------------------------------------------------------------------+
>>>       N                Min           Max        Median           Avg        Stddev
>>> a 120          3621.8761     7356.4442     4606.7895     4607.9132     156.17693
>>> b 120          2664.0563     6359.9686     4519.5036     4534.4463     95.471121
>>>
>>> The patch is not expected to have any impact on the machine you are testing on.
>>> -Chris
>>>
>>
>> What's your code base?
>> For my side:
>> 1) sync the code to the head of Linux mainline
>> 2) git reset --hard 59dd13ad31
>> 3) git revert 59dd13ad3107
>> We compare the test result of commit 59dd13ad3107 (step 2) and
>> 2052847b06f8 (step 3, revert 59dd13ad3107), the regression should
>> related with 59dd13ad3107. Each test case we run 5 times.
> 
> a 59dd13ad31
> b revert
> +mB----------------------------------------------------------------------------+
> |                        a                                                     |
> |                       aa                                                     |
> |                     .b....ba                                                 |
> |                     .b....baa    b                                           |
> |                     .........b . b   b                                       |
> |                a   b.......... ..bb  b        b                              |
> |              b a   b.............b.a b        b                              |
> |a    a  b.    .aaa..b.............b..b....ab   b     a                       .|
> |                      |__A__|                                                 |
> |                      |___A_____|                                             |
> +------------------------------------------------------------------------------+
>      N                Min           Max        Median           Avg        Stddev
> a 120          3658.3435     6363.7812     4527.4406      4536.612     86.095459
> b 120          3928.9643      6375.829     4576.0482     4585.4224      157.284
> 

Could you share with me your test commands and the hardware info, then I 
can reproduce it on my side? Thanks.
-- 
Zhengjun Xing