Messages in this thread | | | Date | Tue, 10 Dec 2019 22:15:02 +0800 | From | kernel test robot <> | Subject | Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0% regression |
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On Mon, Dec 09, 2019 at 10:35:35AM -0800, Linus Torvalds wrote: > On Mon, Dec 9, 2019 at 12:56 AM Michal Hocko <mhocko@kernel.org> wrote: > > > > Huh. How can something like that can even can get merged? No changelog, > > no s-o-b? > > Yeah, I missed that when pulling. > > I wish that had been the only problem we had with that code, but it wasn't. > > Anyway, I'm fairly certain the current git head should fix this > lmbench3 performance regression too. > > Linus
Hi Linus,
Sorry for the inconvenience, indeed, the regression has been fixed.
commit: cefa80ced5 ("pipe: Increase the writer-wakeup threshold to reduce context-switch count") 3c0edea9b2 ("pipe: Remove sync on wake_ups") 6794862a16 ("Merge tag 'for-5.5-rc1-kconfig-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux")
cefa80ced57a2917 3c0edea9b29f9be6c093f236f7 6794862a16ef41f753abd75c03 testcase/testparams/testbox ---------------- -------------------------- -------------------------- --------------------------- %stddev change %stddev change %stddev \ | \ | \ 21204 -17% 17604 23% 26123 ± 3% lmbench3/performance-development-100%-PIPE-50%-ucode=0x7000019/lkp-bdw-de1 21204 -17% 17604 23% 26123 GEO-MEAN lmbench3.PIPE.bandwidth.MB/sec
Best Regards, Rong Chen
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