Messages in this thread | | | Date | Wed, 26 Aug 2020 09:45:58 +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 Wed, Aug 26, 2020 at 12:44:37AM +0800, Luck, Tony wrote: > > These 2 variables are accessed in 2 hot call stacks (for this 288 CPU > > Xeon Phi platform): > > This might be the key element of "weirdness" for this system. It > has 288 CPUs ... cache alignment problems are often not too bad > on "small" systems. The as you scale up to bigger machines you > suddenly hit some critical point and performance drops dramatically. > > It's good that you are picking up tips on how to bisect these and diagnose > the underlying problem. Number of cores is going to keep increasing, so > we will keep finding new issues like this.
Yes, now we have one more bullet for shooting this kind of strange performance changes :)
Thanks, Feng
> -Tony
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