Re: [LKP] Re: [sched] bdfcae1140: will-it-scale.per_thread_ops -37.0% regression

[Xing Zhengjun]

On 10/22/2020 9:19 PM, Mathieu Desnoyers wrote:
> ----- On Oct 21, 2020, at 9:54 PM, Xing Zhengjun zhengjun.xing@xxxxxxxxxxxxxxx wrote:
> [...]
> > In fact, 0-day just copy the will-it-scale benchmark from the GitHub, if
> > you think the will-it-scale benchmark has some issues, you can
> > contribute your idea and help to improve it, later we will update the
> > will-it-scale benchmark to the new version.
>
> This is why I CC'd the maintainer of the will-it-scale github project, Anton Blanchard.
> My main intent is to report this issue to him, but I have not heard back from him yet.
> Is this project maintained ? Let me try to add his ozlabs.org address in CC.
>
> > For this test case, if we bind the workload to a specific CPU, then it
> > will hide the scheduler balance issue. In the real world, we seldom bind
> > the CPU...
>
> When you say that you bind the workload to a specific CPU, is that done
> outside of the will-it-scale testsuite, thus limiting the entire testsuite
> to a single CPU, or you expect that internally the will-it-scale context-switch1
> test gets affined to a single specific CPU/core/hardware thread through use of
> hwloc ?
The later one.

> Thanks,
>
> Mathieu

--
Zhengjun Xing