Re: Ryzen 4000 (Mobile) Softlocks/Micro-stutters

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Tue, 2021-03-16 at 09:02 +0100, Jan Beulich wrote:
> On 16.03.2021 03:10, Dylanger Daly wrote:
> > I just wanted to close this off and let everyone know the issue
> > ended up being a faulty/misconfigured HPET clock.
> > 
> > Appending `clocksource=tsc tsc=unstable hpetbroadcast=0` to Xen's
> > CMDLINE totally fixed my issue, I assume Xen was detecting TSC may
> > have been 'off' and was trying to recover/self-correct?
> 
> I find this a very confusing combination of command line options.
> In particular "tsc=unstable" clears one of the feature prereqs
> (TSC_RELIABLE) that are required for "clocksource=tsc" to take
> any effect, afaict. I therefore would conclude that you're not
> actually running with TSC as the clock source. 
>
Right. Also, isn't hpetbroadcast set to 0 by default already?

Dario
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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