Re: [PATCH v1 0/2] cpuidle: teo: Refine handling of short idle intervals

From: Artem Bityutskiy
Date: Wed Apr 09 2025 - 02:52:37 EST


On Thu, 2025-04-03 at 21:16 +0200, Rafael J. Wysocki wrote:
> Hi Everyone,
>
> This series is intended to address an issue with overly aggressive selection
> of idle state 0 (the polling state) in teo on x86 in some cases when timer
> wakeups dominate the CPU wakeup pattern.

Hi Rafael, I ran SPECjbb2015 with and without these 2 patches on Granite Rapids
Xeon (GNR).

Expectation: no measurable difference, because there is almost no POLL in case
of SPECjbb2015 on GNR.

Result: no measurable difference.

Conclusion: these 2 patches do not introduce a regression as measured by
SPECjbb2015 on GNR.

"No regression" is also a useful piece of information, so reporting.

Thanks, Artem.