Messages in this thread | | | Date | Thu, 19 Jan 2023 11:02:43 +0530 | Subject | Re: [PATCH v11 09/11] Documentation: introduce amd pstate active mode kernel command line options | From | Wyes Karny <> |
| |
On 1/18/2023 1:22 PM, Perry Yuan wrote: > AMD Pstate driver support another firmware based autonomous mode > with "amd_pstate=active" added to the kernel command line. > In autonomous mode SMU firmware decides frequencies at runtime > based on workload utilization, usage in other IPs, infrastructure > limits such as power, thermals and so on. > > Acked-by: Huang Rui <ray.huang@amd.com> > Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> > Tested-by: Wyes Karny <wyes.karny@amd.com> > Signed-off-by: Perry Yuan <perry.yuan@amd.com> Reviewed-by: Wyes Karny <wyes.karny@amd.com>
> --- > Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 6cfa6e3996cf..e3618dfdb36a 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -7020,3 +7020,10 @@ > management firmware translates the requests into actual > hardware states (core frequency, data fabric and memory > clocks etc.) > + active > + Use amd_pstate_epp driver instance as the scaling driver, > + driver provides a hint to the hardware if software wants > + to bias toward performance (0x0) or energy efficiency (0xff) > + to the CPPC firmware. then CPPC power algorithm will > + calculate the runtime workload and adjust the realtime cores > + frequency.
-- Thanks & Regards, Wyes
| |