Re: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions

[Christian Loehle]

On 10/14/25 08:43, Sergey Senozhatsky wrote:
> Hello,
> 
> We are observing performance regressions (cpu usage, power
> consumption, dropped frames in video playback test, etc.)
> after updating to recent stable kernels.  We tracked it down
> to commit 3cd2aa93674e in linux-6.1.y and commit 3cd2aa93674
> in linux-6.6.y ("cpuidle: menu: Avoid discarding useful information",
> upstream commit 85975daeaa4).
> 
> Upstream fixup fa3fa55de0d ("cpuidle: governors: menu: Avoid using
> invalid recent intervals data") doesn't address the problems we are
> observing.  Revert seems to be bringing performance metrics back to
> pre-regression levels.

Any details would be much appreciated.
How do the idle state usages differ with and without
"cpuidle: menu: Avoid discarding useful information"?
What do the idle states look like in your platform?