linux-kernel - Re: [PATCH 0/2] amd-pstate: Make amd-pstate the default driver on server platforms

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Message-ID: <Zxcz7RiUxhETNYNM@BLRRASHENOY1.amd.com>
Date: Tue, 22 Oct 2024 10:41:09 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Perry Yuan <perry.yuan@....com>, Huang Rui <ray.huang@....com>,
	Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>,
	Swapnil Sapkal <swapnil.sapkal@....com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] amd-pstate: Make amd-pstate the default driver on
 server platforms

Hello Mario,

On Mon, Oct 21, 2024 at 08:05:17AM -0500, Mario Limonciello wrote:
> On 10/21/2024 05:18, Gautham R. Shenoy wrote:
> > Hello,
> > 
> > This patchset contains two patches to
> > 
> > * Prevent frequency throttling on power-limited systems with
> >    amd-pstate active mode with performance governor.
> > 
> > * Make amd_pstate default on EPYC Family 1A+. Based on tests, the
> >    amd-pstate driver performs well enough on EPYC.
> > 
> > These patches are based on the "linux-next" branch of
> > https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git
> > 
> > Gautham R. Shenoy (1):
> >    amd-pstate: Set min_perf to nominal_perf for active mode performance
> >      gov
> > 
> > Swapnil Sapkal (1):
> >    amd-pstate: Switch to amd-pstate by default on some Server platforms
> > 
> >   drivers/cpufreq/amd-pstate.c | 6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> 
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
>

Thank you!

> I'll queue this up for 6.13.
> 
> There were previously two differences for server and non-server:
>  * amd-pstate not enabled by default
>  * amd-pstate cpufreq policy starting in performance mode vs power-save?
> 
> This series adjusts the first for at least the newer parts, but I would like
> to ask does it make sense to also evaluating changing the default policy to
> powersave as a follow up, or should this policy delta remain?

We would like to retain the policy delta for now and retain
CPUFREQ_POLICY_PERFORMANCE as the default on servers.

--
Thanks and Regards
gautham.