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| author | Perry Yuan <[email protected]> | 2023-01-31 17:00:09 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <[email protected]> | 2023-02-03 21:59:41 +0100 |
| commit | ffa5096a7c338641f70fb06d4778e8cf400181a8 (patch) | |
| tree | b603f0be0b63508644c3abfa0604d290fc3aa01b /tools/perf/scripts/python/bin/export-to-postgresql-report | |
| parent | 36c5014e5460963ad7766487c0e22a7ff28681fc (diff) | |
cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors
Add EPP driver support for AMD SoCs which support a dedicated MSR for
CPPC. EPP is used by the DPM controller to configure the frequency that
a core operates at during short periods of activity.
The SoC EPP targets are configured on a scale from 0 to 255 where 0
represents maximum performance and 255 represents maximum efficiency.
The amd-pstate driver exports profile string names to userspace that are
tied to specific EPP values.
The balance_performance string (0x80) provides the best balance for
efficiency versus power on most systems, but users can choose other
strings to meet their needs as well.
$ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences
default performance balance_performance balance_power power
$ cat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference
balance_performance
To enable the driver,it needs to add `amd_pstate=active` to kernel
command line and kernel will load the active mode epp driver
Acked-by: Huang Rui <[email protected]>
Reviewed-by: Mario Limonciello <[email protected]>
Reviewed-by: Wyes Karny <[email protected]>
Tested-by: Wyes Karny <[email protected]>
Signed-off-by: Perry Yuan <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/bin/export-to-postgresql-report')
0 files changed, 0 insertions, 0 deletions