Re: [PATCH 2/3] KVM: Expose the initial start value in grow_halt_poll_ns() as a module parameter

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On 27/01/19 11:17, Nir Weiner wrote:
> The optimal value changes between different workloads. It depends on
> outliers rate and polling sessions length.
> As this value has significant effect on the dynamic halt-polling
> algorithm, it should be configurable and exposed.

What are the cases where you found the effect to be strongly negative?
In practice we observed only three workloads: mostly idle (no polling),
mostly busy (no HLT), repeatedly switching between idle and polling
(always polling).

The start value basically gives you a measure of how likely KVM is to
"think" it's in the third workload.

I'm not against the series, but perhaps it's possible to make the auto
tuning better too.

Paolo



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