Messages in this thread | | | Date | Mon, 19 Dec 2022 17:29:34 -0600 | Subject | Re: [PATCH v8 11/13] Documentation: introduce amd pstate active mode kernel command line options | From | "Limonciello, Mario" <> |
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On 12/19/2022 00:40, 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 1 ms timescale
This might be the case right now, but I don't know that it will always be this timescale. Suggest to drop drop "at 1ms timescale".
> based on workload utilization, usage in other IPs, infrastructure > limits such as power, thermals and so on. > > Signed-off-by: Perry Yuan <perry.yuan@amd.com>
With nit fixed:
Reviewed-by: Mario Limonciello <mario.limonciello@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 42af9ca0127e..73a02816f6f8 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -6970,3 +6970,10 @@ > 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.
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