Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 3 Sep 2017 10:09:05 -0700 | Subject | Re: Linux 4.13: Reported regressions as of Sunday, 2017-09-03 |
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On Sun, Sep 3, 2017 at 2:36 AM, Thorsten Leemhuis <regressions@leemhuis.info> wrote: > > [x86/mm/gup] e585513b76: will-it-scale.per_thread_ops -6.9% regression > Status: Asked on the list, but looks like issue gets ignored by everyone > Note: I'm a bit unsure if adding this issue to this list was a good > idea. Side note: Was reported against linux-next in May already > Reported: 2017-07-10 > http://lkml.kernel.org/r/20170710024020.GA26389@yexl-desktop > Cause: https://git.kernel.org/torvalds/c/e585513b76f7
Sadly, while I love the concept of performance tracking, the "will-it-scale" reports haven't really been reliable enough to really be useful. There is a _ton_ of noise in the numbers, and the test-cases don't seem to be stable enough to really track sanely.
I wish it was otherwise, because we also got a report of "57.3% improvement of will-it-scale.per_process_ops" this release.
So I find the kernel test robot performance tracking very interesting in theory, but as things stand now I think it's just that: "interesting". Not quite ready for action.
Linus
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