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SubjectRe: [locking/rwsem] 10a59003d2: unixbench.score -25.5% regression
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On 11/23/20 10:53 AM, kernel test robot wrote:
>
> Greeting,
>
> FYI, we noticed a -25.5% regression of unixbench.score due to commit:
>
>
> commit: 10a59003d29fbfa855b2ef4f3534fee9bdf4e575 ("[PATCH v2 5/5] locking/rwsem: Remove reader optimistic spinning")
> url: https://github.com/0day-ci/linux/commits/Waiman-Long/locking-rwsem-Rework-reader-optimistic-spinning/20201121-122118
> base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 932f8c64d38bb08f69c8c26a2216ba0c36c6daa8
>
> in testcase: unixbench
> on test machine: 16 threads Intel(R) Xeon(R) E-2278G CPU @ 3.40GHz with 32G memory
> with following parameters:
>
> runtime: 300s
> nr_task: 30%
> test: shell8
> cpufreq_governor: performance
> ucode: 0xde
>
> test-description: UnixBench is the original BYTE UNIX benchmark suite aims to test performance of Unix-like system.
> test-url: https://github.com/kdlucas/byte-unixbench
>
> In addition to that, the commit also has significant impact on the following tests:
>
> +------------------+---------------------------------------------------------------------------+
> | testcase: change | fio-basic: fio.write_iops -29.9% regression |
> | test machine | 192 threads Intel(R) Xeon(R) CPU @ 2.20GHz with 192G memory |
> | test parameters | bs=4k |
> | | cpufreq_governor=performance |
> | | disk=1SSD |
> | | fs=xfs |
> | | ioengine=sync |
> | | nr_task=32 |
> | | runtime=300s |
> | | rw=randwrite |
> | | test_size=256g |
> | | ucode=0x4003003 |
> +------------------+---------------------------------------------------------------------------+
> | testcase: change | aim7: aim7.jobs-per-min 952.6% improvement |
> | test machine | 96 threads Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz with 128G memory |
> | test parameters | cpufreq_governor=performance |
> | | disk=4BRD_12G |
> | | fs=f2fs |
> | | load=100 |
> | | md=RAID0 |
> | | test=sync_disk_rw |
> | | ucode=0x4003003 |
> +------------------+---------------------------------------------------------------------------+

A performance drop in some benchmark is expected. However, there are
others that can show improvement. Will take a look to see if we can
reduce the performance regression.

Thanks,
Longman

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