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
