| Message ID | 20221219064042.661122-12-perry.yuan@amd.com |
|---|---|
| State | Superseded |
| Headers | show
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From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
<ray.huang@amd.com>, <viresh.kumar@linaro.org>
CC: <Deepak.Sharma@amd.com>, <Nathan.Fontenot@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 |
[v8,01/13] ACPI: CPPC: Add AMD pstate energy performance preference cppc control
|
expand
|
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.
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(+)