Messages in this thread | | | Date | Mon, 24 Aug 2020 23:48:18 +0800 | From | Feng Tang <> | Subject | Re: [LKP] Re: [x86/mce] 1de08dccd3: will-it-scale.per_process_ops -14.1% regression |
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On Mon, Aug 24, 2020 at 11:38:53PM +0800, Luck, Tony wrote: > > 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.
Thanks for the hint! This will definitely help tracking strange performance changes like this, as a general debug mthod.
Thanks, Feng
> > -Tony
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