ACK: [SRU U/L/K/J] Adjust balanced governor for Sappire Rapids

[Luke Nowakowski-Krijger]

Acked-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com>

On Fri, Mar 10, 2023 at 2:54 AM Stefan Bader <stefan.bader at canonical.com>
wrote:

> BugLink: https://bugs.launchpad.net/bugs/2008519
>
> The goal is to adjust the behavior of the balanced governor for certain
> Xeon
> CPUs (those are CPUs rather seen in servers so there should be no impact on
> laptop users). While the initial request was Jammy/5.15 only we should do
> this to Kinetic and Lunar as well so the experience is the same regardless
> of
> release.
>
> == Fix ==
> This picks one change from v6.3-rc1 which tweaks the intel_idle driver for
> a
> specific CPU model. For Jammy/5.15 this requires one additional change
> which introduces the EPP tweak for Alderlake.
>
> == Regression Potential ==
> The change modifies how quickly CPUs scale up (and probably down)
> depending on
> workload. Power usage unlikely is of that much concern in server space.
> Maybe
> increased heat would be observed.
> For Jammy there is the additional risk of havind a different power usage
> on Alderlake which is a Laptop CPU. However that change is part of v5.17
> and thus would already be in effect with current 22.04 HWE.
>
>
> Srinivas Pandruvada (1):
>   cpufreq: intel_pstate: Adjust balance_performance EPP for Sapphire
>     Rapids
>
>  drivers/cpufreq/intel_pstate.c | 1 +
>  1 file changed, 1 insertion(+)
>
> --
> 2.34.1
>
>
> --
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>
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