Messages in this thread | | | Date | Fri, 25 Feb 2022 05:07:15 +0530 | Subject | Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on hotplug events | From | Abhishek Goel <> |
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On 24/02/22 05:35, Dave Hansen wrote: > On 2/23/22 15:02, Abhishek Goel wrote: >> If needed, I will provide experiment results and traces that were used >> to conclude this. > It would be great if you can provide some more info. Even just a CPU > time profile would be helpful.
Average total time taken for SMT=8 to SMT=1 in v5.14 : 20s
Average total time taken for SMT=8 to SMT=1 in v5.15 : 36s
(Observed in system with 150+ CPUs )
> > It would also be great to understand more about what "hotplug on power > systems" actually means. Is this a synthetic benchmark, or are actual > end-users running into this issue? Are entire nodes of CPUs going > offline? Or is this just doing an offline/online of CPU 22 in a 100-CPU > NUMA node? No, this is not a synthetic benchmark. This can be recreated with entire nodes of CPUs going offline. And the online/offline operations have been performed by simple scripts. The time observed can also be verified (for individual CPU or the entire system) by observing CPU- Hotplug trace which provide consistent result as observed by using the scripts.
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