Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [LKP] Re: [x86/mce] 1de08dccd3: will-it-scale.per_process_ops -14.1% regression | Date | Mon, 24 Aug 2020 15:38:53 +0000 |
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> Yes, that's what we suspected. And I just did another try to force the > percpu mce structure aligned. And the regression seems to be gone (reduced > from 14.1% to 2%), which further proved it.
I wonder whether it would be useful for bisection of performance issues for you to change the global definition of DEFINE_PER_CPU() to make all per CPU definitions aligned. Just like you switch compiler flags to make all functions aligned.
-Tony
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