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Message-ID:
<CYYPR12MB865528E6FD5D537577749B5C9C7E2@CYYPR12MB8655.namprd12.prod.outlook.com>
Date: Mon, 29 Jan 2024 05:07:12 +0000
From: "Yuan, Perry" <Perry.Yuan@....com>
To: "Limonciello, Mario" <Mario.Limonciello@....com>,
"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>, "Huang, Ray"
<Ray.Huang@....com>, "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
"Petkov, Borislav" <Borislav.Petkov@....com>
CC: "Deucher, Alexander" <Alexander.Deucher@....com>, "Huang, Shimmer"
<Shimmer.Huang@....com>, "Du, Xiaojian" <Xiaojian.Du@....com>, "Meng, Li
(Jassmine)" <Li.Meng@....com>, "linux-pm@...r.kernel.org"
<linux-pm@...r.kernel.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the new
cpu boost control method
[AMD Official Use Only - General]
> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@....com>
> Sent: Friday, January 26, 2024 11:47 PM
> To: Yuan, Perry <Perry.Yuan@....com>; rafael.j.wysocki@...el.com;
> viresh.kumar@...aro.org; Huang, Ray <Ray.Huang@....com>; Shenoy,
> Gautham Ranjal <gautham.shenoy@....com>; Petkov, Borislav
> <Borislav.Petkov@....com>
> Cc: Deucher, Alexander <Alexander.Deucher@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>; Meng,
> Li (Jassmine) <Li.Meng@....com>; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the
> new cpu boost control method
>
> On 1/26/2024 02:08, Perry Yuan wrote:
> > From: Perry Yuan <Perry.Yuan@....com>
> >
> > Introduce AMD CPU frequency boosting control sysfs entry which userd
> > for switching boost on and boost off.
>
> Typo in this sentence.
Fixed by V2.
>
> >
> > If core performance boost is disabled while a core is in a boosted
> > P-state, the core automatically transitions to the highest performance
> > non-boosted P-state The highest perf and frequency will be limited by the
> setting value.
> >
> > Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> > ---
> > Documentation/admin-guide/pm/amd-pstate.rst | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/Documentation/admin-guide/pm/amd-pstate.rst
> > b/Documentation/admin-guide/pm/amd-pstate.rst
> > index 1cf40f69278c..d72dc407c4db 100644
> > --- a/Documentation/admin-guide/pm/amd-pstate.rst
> > +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> > @@ -385,6 +385,17 @@ control its functionality at the system level. They
> are located in the
> > to the operation mode represented by that string - or to be
> > unregistered in the "disable" case.
> >
> > +``cpb_boost``
> > + Specifies whether core performance boost is requested to be enabled
> or disabled
> > + If core performance boost is disabled while a core is in a boosted P-
> state, the
> > + core automatically transitions to the highest performance non-boosted
> P-state.
> > + AMD Core Performance Boost(CPB) is controlled by this new attribute
> file which
> > + allow user to change all cores frequency boosting state. It supports
> both
> > + ``active mode`` and ``passive mode`` control with below value write to
> it.
>
> Does it also support guided mode?
Yes, guide mode is also supported and I tested it. Looks like it is better to add the guide mode support info
Into the doc update. Will update in V2.
# cat /sys/devices/system/cpu/amd_pstate/status
guided
check on and off lscpu output.
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ
0 0 0 0 0:0:0:0 yes 4201.0000 400.0000 2983.578
1 0 0 1 1:1:1:0 yes 4201.0000 400.0000 2983.578
2 0 0 2 2:2:2:0 yes 4201.0000 400.0000 2983.578
3 0 0 3 3:3:3:0 yes 4201.0000 400.0000 2983.578
4 0 0 4 4:4:4:0 yes 4201.0000 400.0000 2983.578
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ
0 0 0 0 0:0:0:0 yes 5759.0000 400.0000 2983.578
1 0 0 1 1:1:1:0 yes 5759.0000 400.0000 2983.578
2 0 0 2 2:2:2:0 yes 5759.0000 400.0000 2983.578
3 0 0 3 3:3:3:0 yes 5759.0000 400.0000 2983.578
4 0 0 4 4:4:4:0 yes 5759.0000 400.0000 2983.578
>
> > +
> > + "0" Disable Core performance Boosting
> > + "1" Enable Core performance Boosting
> > +
> > ``cpupower`` tool support for ``amd-pstate``
> > ===============================================
> >
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