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Date: Thu, 19 Nov 2020 15:20:18 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Zbigniew Kempczyński
<zbigniew.kempczynski@...el.com>,
Matthew Auld <matthew.william.auld@...il.com>,
Matthew Auld <matthew.auld@...el.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com, ying.huang@...el.com, feng.tang@...el.com,
zhengjun.xing@...el.com, guobing.chen@...el.com,
ming.a.chen@...el.com, frank.du@...el.com, Shuhua.Fan@...el.com,
wangyang.guo@...el.com, Wenhuan.Huang@...el.com,
jessica.ji@...el.com, shan.kang@...el.com, guangli.li@...el.com,
tiejun.li@...el.com, yu.ma@...el.com, dapeng1.mi@...el.com,
jiebin.sun@...el.com, gengxin.xie@...el.com, fan.zhao@...el.com,
zhengjun.xing@...ux.intel.com, intel-gfx@...ts.freedesktop.org
Subject: Re: [drm/i915/gem] 59dd13ad31:
phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second
-54.0% regression
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,
>
> According to Chris test has various factors affecting why the result
> could fluctuate and has been known. Reverting the patch did not have
> an effect on the benchmark and was not expected to do so, either.
>
> Is there some mechanism to queue a re-run?
>
> Would it make sense to do further runs before sending out the e-mail
> to avoid false positives.
>
> It could of course be also solved by sticking to tests that have less
> fluctuation in them.
>
> Regards, Joonas
>
> >
> >
> > commit: 59dd13ad310793757e34afa489dd6fc8544fc3da ("drm/i915/gem: Flush coherency domains on first set-domain-ioctl")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> >
> > in testcase: phoronix-test-suite
> > on test machine: 12 threads Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz with 8G memory
> > with following parameters:
> >
> > need_x: true
> > test: jxrendermark-1.2.4
> > option_a: Radial Gradient Paint
> > option_b: 1024x1024
> > cpufreq_governor: performance
> > ucode: 0xd6
> >
> > test-description: The Phoronix Test Suite is the most comprehensive testing and benchmarking platform available that provides an extensible framework for which new tests can be easily added.
> > test-url: http://www.phoronix-test-suite.com/
> >
> >
> >
> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> >
> >
> > Details are as below:
> > -------------------------------------------------------------------------------------------------->
> >
> >
> > To reproduce:
> >
> > git clone https://github.com/intel/lkp-tests.git
> > cd lkp-tests
> > bin/lkp install job.yaml # job file is attached in this email
> > bin/lkp run job.yaml
> >
> > =========================================================================================
> > compiler/cpufreq_governor/kconfig/need_x/option_a/option_b/rootfs/tbox_group/test/testcase/ucode:
> > gcc-9/performance/x86_64-rhel-8.3/true/Radial Gradient Paint/1024x1024/debian-x86_64-phoronix/lkp-cfl-d1/jxrendermark-1.2.4/phoronix-test-suite/0xd6
> >
> > commit:
> > 0dccdba51e ("Merge tag 'gvt-fixes-2020-10-30' of https://github.com/intel/gvt-linux into drm-intel-fixes")
> > 59dd13ad31 ("drm/i915/gem: Flush coherency domains on first set-domain-ioctl")
> >
> > 0dccdba51e852271 59dd13ad310793757e34afa489d
> > ---------------- ---------------------------
> > %stddev %change %stddev
> > \ | \
> > 8980 ± 2% -54.0% 4127 phoronix-test-suite.jxrendermark.RadialGradientPaint.1024x1024.operations_per_second
> > 9.00 +13.9% 10.25 ± 4% phoronix-test-suite.time.percent_of_cpu_this_job_got
> >
> >
> >
> >
> >
> > 10000 +-------------------------------------------------------------------+
> > | |
> > 9000 |-+.+. .+.+.+.+.+. .+. .+. .+. .+.+. .+. .+. .+. .+.+. .|
> > |.+ + +.+ + +.+ + +.+.+ + +.+ + +.+ |
> > | |
> > 8000 |-+ |
> > | |
> > 7000 |-+ |
> > | |
> > 6000 |-+ |
> > | |
> > | |
> > 5000 |-+ |
> > | O |
> > 4000 +-------------------------------------------------------------------+
> >
> >
> > [*] bisect-good sample
> > [O] bisect-bad sample
> >
> >
> >
> > Disclaimer:
> > Results have been estimated based on internal Intel analysis and are provided
> > for informational purposes only. Any difference in system hardware or software
> > design or configuration may affect actual performance.
> >
> >
> > Thanks,
> > Oliver Sang
> >
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