linux-kernel - Re: [PATCH] cpufreq: intel_pstate: Update Meteor Lake EPPs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAJZ5v0i8RnWs9OgxxqVOCG4RHhN7X3ELcruPoGrS1iP8hNSGsw@mail.gmail.com>
Date: Fri, 7 Jun 2024 21:08:28 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: rafael@...nel.org, viresh.kumar@...aro.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: intel_pstate: Update Meteor Lake EPPs

On Thu, Jun 6, 2024 at 8:12 PM Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> Update the default balance_performance EPP to 64. This gives better
> performance and also perf/watt compared to current value of 115.
>
> For example:
>
> Speedometer 2.1
>         score: +19%
>         Perf/watt: +5.25%
>
> Webxprt 4 score
>         score: +12%
>         Perf/watt: +6.12%
>
> 3DMark Wildlife extreme unlimited score
>         score: +3.2%
>         Perf/watt: +11.5%
>
> Geekbench6 MT
>         score: +2.14%
>         Perf/watt: +0.32%
>
> Also update balance_power EPP default to 179. With this change:
>         Video Playback power is reduced by 52%
>         Team video conference power is reduced by 35%
>
> With Power profile daemon now sets balance_power EPP on DC instead of
> balance_performance, updating balance_power EPP will help to extend
> battery life.
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
>  drivers/cpufreq/intel_pstate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index dbbf299f4219..8b0032d6a519 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -3429,7 +3429,7 @@ static const struct x86_cpu_id intel_epp_default[] = {
>         X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, HWP_SET_DEF_BALANCE_PERF_EPP(102)),
>         X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
>         X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE_L, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
> -                                                       HWP_EPP_BALANCE_POWERSAVE, 115, 16)),
> +                                                                   179, 64, 16)),
>         {}
>  };
>
> --

Rebased on top of the Tony's series:

https://lore.kernel.org/linux-acpi/20240528184720.56259-1-tony.luck@intel.com/

and applied as 6.11 material.

Thanks!