[v8,11/13] Documentation: introduce amd pstate active mode kernel command line options
| Message ID | 20221219064042.661122-12-perry.yuan@amd.com |
|---|---|
| State | New |
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From: Perry Yuan <perry.yuan@amd.com>
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Subject: [PATCH v8 11/13] Documentation: introduce amd pstate active mode
kernel command line options
Date: Mon, 19 Dec 2022 14:40:40 +0800
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| Series |
Implement AMD Pstate EPP Driver
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Commit Message
Yuan, Perry
Dec. 19, 2022, 6:40 a.m. UTC
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
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>
---
Documentation/admin-guide/kernel-parameters.txt | 7 +++++++
1 file changed, 7 insertions(+)
Comments
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.
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.