Re: [clocksource] 8901ecc231: stress-ng.lockbus.ops_per_sec -9.5% regression

[Andi Kleen]

> My current thought is that if more than (say) 100 consecutive attempts
> to read the clocksource get hit with excessive delays, it is time to at
> least do a WARN_ON(), and maybe also time to disable the clocksource
> due to skew.  The reason is that if reading the clocksource -always-
> sees excessive delays, perhaps the clock driver or hardware is to blame.
>
> Thoughts?

On TDX this would be fatal because we don't have a usable fallback source

(just jiffies). Better try as hard as possible.


-Andi

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