Messages in this thread | | | Subject | Re: [locking/rwsem] 10a59003d2: unixbench.score -25.5% regression | From | Waiman Long <> | Date | Mon, 23 Nov 2020 14:28:23 -0500 |
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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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