Messages in this thread | | | From | Zdenek Kabelac <> | Subject | Timing performance regression 4.15 to 4.16-rc1 | Date | Sun, 11 Mar 2018 14:02:03 +0100 |
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Hi
I've noticed quite some drop of performance (around 15% in some cases) where execution of lvm2 tests took longer time - and while tests itself should not really load CPU system - the overall running time just got bigger.
Running bisect game pointed clearly to this commit:
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commit 44c02a2c3dc55835e9f0d8ef73966406cd805001 Author: Al Viro <viro@zeniv.linux.org.uk> Date: Thu Oct 5 12:59:44 2017 -0400
dev_ioctl(): move copyin/copyout to callers
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clear revert of this commit on top of 3266b5bd97eaa72793df0b6e5a106c69ccc166c4 (recent ~4.16-rc4) restored timing of tests back.
I'm not sure why - so at this moment this is just a patch causing 15% longer running times on lvm2 test suite.
Regards
Zdenek
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