Re: Ars claims: Fedora 32 is sluggish

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Am 11.02.21 um 15:28 schrieb Peter Robinson:
> On Thu, Feb 11, 2021 at 1:03 PM Ondrej Mosnacek <omosnace@xxxxxxxxxx> wrote:
>> On Thu, Feb 11, 2021 at 10:14 AM Viktor Ashirov <vashirov@xxxxxxxxxx> wrote:
>>> On Wed, Feb 3, 2021 at 5:54 PM Michael Catanzaro <mcatanzaro@xxxxxxxxx> wrote:
> […]
>>> This was bugging me for a while. I also noticed that Fedora 32 is a bit slower than it used to be. Compilation time of a project that I'm working on went from ~35-36 seconds to ~47-48. At first I thought that it's just another round of CPU vulnerabilities mitigations that introduced a performance drop. But after some digging I found that the default CPU governor was switched from 'ondemand' to 'schedutil' in Fedora kernel 5.9.7:
>  […]
> It was upstream changes, the Intel maintainer changed it in [1] if
> X86_INTEL_PSTATE state was selected in late March which would make
> sense in the timg, and also changed for arm arches [2] in July.
> 
> If that change was made upstream I'm assuming it was assumed that
> performance should be equivalent or better than the other option, I
> suspect we should engage with upstream as they're probably interested
> in the issues.

FWIW, I wonder if some changes that were merged for mainline this week
might be related:

https://git.kernel.org/torvalds/c/291009f656e8eaebbdfd3a8d99f6b190a9ce9deb
https://git.kernel.org/torvalds/c/d11a1d08a082a7dc0ada423d2b2e26e9b6f2525c
https://git.kernel.org/torvalds/c/3c55e94c0adea4a5389c4b80f6ae9927dd6a4501

But I'm not entirely sure what CPUs are affected by d11a1d08a082

HTH, CU, thl
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