mbox series

[v4,0/6] amd_pstate: Add guided autonomous mode support

Message ID 20230131052141.96475-1-wyes.karny@amd.com
Headers
Series amd_pstate: Add guided autonomous mode support |

Message

Wyes Karny Jan. 31, 2023, 5:21 a.m. UTC 
  From ACPI spec[1] below 3 modes for CPPC can be defined:
1. Non autonomous: OS scaling governor specifies operating frequency/
   performance level through `Desired Performance` register and platform
follows that.
2. Guided autonomous: OS scaling governor specifies min and max
   frequencies/ performance levels through `Minimum Performance` and
`Maximum Performance` register, and platform can autonomously select an
operating frequency in this range.
3. Fully autonomous: OS only hints (via EPP) to platform for the required
   energy performance preference for the workload and platform autonomously
scales the frequency.

Currently (1) is supported by amd_pstate as passive mode, and (3) is
implemented by EPP support[2]. This change is to support (2).

In guided autonomous mode the min_perf is based on the input from the
scaling governor. For example, in case of schedutil this value depends
on the current utilization. And max_perf is set to max capacity.

To activate guided auto mode ``amd_pstate=guided`` command line
parameter has to be passed in the kernel.

Below are the results (normalized) of benchmarks with this patch:
System: Genoa 96C 192T
Kernel: 6.2.0-rc2 + EPP v11 + patch
Scaling governor: schedutil

================ dbench comparisons ================
dbench result comparison:
Here results are throughput (MB/s)
Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
    1	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
    2	   1.07 (0.00 pct)	   1.06 (-0.93 pct)	   1.07 (0.00 pct)
    4	   1.68 (0.00 pct)	   1.70 (1.19 pct)	   1.72 (2.38 pct)
    8	   2.61 (0.00 pct)	   2.68 (2.68 pct)	   2.76 (5.74 pct)
   16	   4.16 (0.00 pct)	   4.24 (1.92 pct)	   4.53 (8.89 pct)
   32	   5.98 (0.00 pct)	   6.17 (3.17 pct)	   7.30 (22.07 pct)
   64	   8.67 (0.00 pct)	   8.99 (3.69 pct)	  10.71 (23.52 pct)
  128	  11.98 (0.00 pct)	  12.52 (4.50 pct)	  14.67 (22.45 pct)
  256	  15.73 (0.00 pct)	  16.13 (2.54 pct)	  17.81 (13.22 pct)
  512	  15.77 (0.00 pct)	  16.32 (3.48 pct)	  16.39 (3.93 pct)
dbench power comparison:
Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
    1	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   1.04 (4.00 pct)
    2	   0.99 (0.00 pct)	   0.97 (-2.02 pct)	   1.02 (3.03 pct)
    4	   0.98 (0.00 pct)	   0.98 (0.00 pct)	   1.02 (4.08 pct)
    8	   0.98 (0.00 pct)	   0.99 (1.02 pct)	   1.02 (4.08 pct)
   16	   0.99 (0.00 pct)	   1.00 (1.01 pct)	   1.04 (5.05 pct)
   32	   1.02 (0.00 pct)	   1.02 (0.00 pct)	   1.07 (4.90 pct)
   64	   1.05 (0.00 pct)	   1.05 (0.00 pct)	   1.11 (5.71 pct)
  128	   1.08 (0.00 pct)	   1.08 (0.00 pct)	   1.15 (6.48 pct)
  256	   1.12 (0.00 pct)	   1.12 (0.00 pct)	   1.20 (7.14 pct)
  512	   1.18 (0.00 pct)	   1.17 (-0.84 pct)	   1.26 (6.77 pct)

================ git-source comparisons ================
git-source result comparison:
Here results are throughput (compilations per 1000 sec)
Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
  192	   1.00 (0.00 pct)	   0.93 (-7.00 pct)	   1.00 (0.00 pct)
git-source power comparison:
Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
  192	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   0.96 (-4.00 pct)

================ kernbench comparisons ================
kernbench result comparison:
Here results are throughput (compilations per 1000 sec)
Load:	   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
32	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
48	   1.26 (0.00 pct)	   1.28 (1.58 pct)	   1.25 (-0.79 pct)
64	   1.39 (0.00 pct)	   1.47 (5.75 pct)	   1.43 (2.87 pct)
96	   1.48 (0.00 pct)	   1.50 (1.35 pct)	   1.49 (0.67 pct)
128	   1.29 (0.00 pct)	   1.32 (2.32 pct)	   1.33 (3.10 pct)
192	   1.17 (0.00 pct)	   1.20 (2.56 pct)	   1.21 (3.41 pct)
256	   1.17 (0.00 pct)	   1.18 (0.85 pct)	   1.20 (2.56 pct)
384	   1.16 (0.00 pct)	   1.17 (0.86 pct)	   1.21 (4.31 pct)
kernbench power comparison:
Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
   32	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.00 (0.00 pct)
   48	   0.87 (0.00 pct)	   0.81 (-6.89 pct)	   0.88 (1.14 pct)
   64	   0.81 (0.00 pct)	   0.73 (-9.87 pct)	   0.77 (-4.93 pct)
   96	   0.75 (0.00 pct)	   0.74 (-1.33 pct)	   0.75 (0.00 pct)
  128	   0.83 (0.00 pct)	   0.79 (-4.81 pct)	   0.83 (0.00 pct)
  192	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
  256	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
  384	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)

================ tbench comparisons ================
tbench result comparison:
Here results are throughput (MB/s)
Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
    1	   1.00 (0.00 pct)	   0.70 (-30.00 pct)	   1.37 (37.00 pct)
    2	   2.64 (0.00 pct)	   1.39 (-47.34 pct)	   2.70 (2.27 pct)
    4	   4.89 (0.00 pct)	   2.75 (-43.76 pct)	   5.28 (7.97 pct)
    8	   9.46 (0.00 pct)	   5.42 (-42.70 pct)	  10.22 (8.03 pct)
   16	  19.05 (0.00 pct)	  10.42 (-45.30 pct)	  19.94 (4.67 pct)
   32	  37.50 (0.00 pct)	  20.23 (-46.05 pct)	  36.87 (-1.68 pct)
   64	  61.24 (0.00 pct)	  43.08 (-29.65 pct)	  62.96 (2.80 pct)
  128	  67.16 (0.00 pct)	  69.08 (2.85 pct)	  67.34 (0.26 pct)
  256	 154.59 (0.00 pct)	 162.33 (5.00 pct)	 156.78 (1.41 pct)
  512	 154.02 (0.00 pct)	 156.74 (1.76 pct)	 153.48 (-0.35 pct)
tbench power comparison:
Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
    1	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.08 (8.00 pct)
    2	   1.04 (0.00 pct)	   0.97 (-6.73 pct)	   1.11 (6.73 pct)
    4	   1.12 (0.00 pct)	   0.99 (-11.60 pct)	   1.18 (5.35 pct)
    8	   1.25 (0.00 pct)	   1.04 (-16.80 pct)	   1.31 (4.80 pct)
   16	   1.53 (0.00 pct)	   1.13 (-26.14 pct)	   1.58 (3.26 pct)
   32	   2.01 (0.00 pct)	   1.36 (-32.33 pct)	   2.03 (0.99 pct)
   64	   2.58 (0.00 pct)	   2.14 (-17.05 pct)	   2.61 (1.16 pct)
  128	   2.80 (0.00 pct)	   2.81 (0.35 pct)	   2.81 (0.35 pct)
  256	   3.39 (0.00 pct)	   3.43 (1.17 pct)	   3.42 (0.88 pct)
  512	   3.44 (0.00 pct)	   3.44 (0.00 pct)	   3.44 (0.00 pct)

Note: this series is based on top of EPP v11 [3] series

Change log:

v3 -> v4:
- Fixed active mode low frequency issue reported by Peter Jung and Tor Vic
- Documentation modification suggested by Bagas Sanjaya

v2 -> v3:
- Addressed review comments form Mario.
- Picked up RB tag from Mario.
- Rebase on top of EPP v11 [3].

v1 -> v2:
- Fix issue with shared mem systems.
- Rebase on top of EPP series.

[1]: https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf
[2]: https://lore.kernel.org/lkml/20221110175847.3098728-1-Perry.Yuan@amd.com/
[3]: https://lore.kernel.org/linux-pm/20230118075210.447418-1-perry.yuan@amd.com/

Wyes Karny (6):
  acpi: cppc: Add min and max perf reg writing support
  acpi: cppc: Add auto select register read/write support
  cpufreq: amd_pstate: Add guided autonomous mode
  Documentation: amd_pstate: Move amd_pstate param to alphabetical order
  cpufreq: amd_pstate: Add guided mode control support via sysfs
  Documentation: amd_pstate: Update amd_pstate status sysfs for guided

 .../admin-guide/kernel-parameters.txt         |  41 ++--
 Documentation/admin-guide/pm/amd-pstate.rst   |  31 ++-
 drivers/acpi/cppc_acpi.c                      | 121 +++++++++++-
 drivers/cpufreq/amd-pstate.c                  | 184 +++++++++++++-----
 include/acpi/cppc_acpi.h                      |  11 ++
 include/linux/amd-pstate.h                    |   2 +
 6 files changed, 309 insertions(+), 81 deletions(-)

Comments

Tor Vic Jan. 31, 2023, 10:37 a.m. UTC | #1 
> Wyes Karny <wyes.karny@amd.com> hat am 31.01.2023 05:21 GMT geschrieben:
> 
>  
> From ACPI spec[1] below 3 modes for CPPC can be defined:
> 1. Non autonomous: OS scaling governor specifies operating frequency/
>    performance level through `Desired Performance` register and platform
> follows that.
> 2. Guided autonomous: OS scaling governor specifies min and max
>    frequencies/ performance levels through `Minimum Performance` and
> `Maximum Performance` register, and platform can autonomously select an
> operating frequency in this range.
> 3. Fully autonomous: OS only hints (via EPP) to platform for the required
>    energy performance preference for the workload and platform autonomously
> scales the frequency.
> 
> Currently (1) is supported by amd_pstate as passive mode, and (3) is
> implemented by EPP support[2]. This change is to support (2).
> 
> In guided autonomous mode the min_perf is based on the input from the
> scaling governor. For example, in case of schedutil this value depends
> on the current utilization. And max_perf is set to max capacity.
> 
> To activate guided auto mode ``amd_pstate=guided`` command line
> parameter has to be passed in the kernel.
> 
> Below are the results (normalized) of benchmarks with this patch:
> System: Genoa 96C 192T
> Kernel: 6.2.0-rc2 + EPP v11 + patch
> Scaling governor: schedutil
> 
> ================ dbench comparisons ================
> dbench result comparison:
> Here results are throughput (MB/s)
> Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>     1	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
>     2	   1.07 (0.00 pct)	   1.06 (-0.93 pct)	   1.07 (0.00 pct)
>     4	   1.68 (0.00 pct)	   1.70 (1.19 pct)	   1.72 (2.38 pct)
>     8	   2.61 (0.00 pct)	   2.68 (2.68 pct)	   2.76 (5.74 pct)
>    16	   4.16 (0.00 pct)	   4.24 (1.92 pct)	   4.53 (8.89 pct)
>    32	   5.98 (0.00 pct)	   6.17 (3.17 pct)	   7.30 (22.07 pct)
>    64	   8.67 (0.00 pct)	   8.99 (3.69 pct)	  10.71 (23.52 pct)
>   128	  11.98 (0.00 pct)	  12.52 (4.50 pct)	  14.67 (22.45 pct)
>   256	  15.73 (0.00 pct)	  16.13 (2.54 pct)	  17.81 (13.22 pct)
>   512	  15.77 (0.00 pct)	  16.32 (3.48 pct)	  16.39 (3.93 pct)
> dbench power comparison:
> Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>     1	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   1.04 (4.00 pct)
>     2	   0.99 (0.00 pct)	   0.97 (-2.02 pct)	   1.02 (3.03 pct)
>     4	   0.98 (0.00 pct)	   0.98 (0.00 pct)	   1.02 (4.08 pct)
>     8	   0.98 (0.00 pct)	   0.99 (1.02 pct)	   1.02 (4.08 pct)
>    16	   0.99 (0.00 pct)	   1.00 (1.01 pct)	   1.04 (5.05 pct)
>    32	   1.02 (0.00 pct)	   1.02 (0.00 pct)	   1.07 (4.90 pct)
>    64	   1.05 (0.00 pct)	   1.05 (0.00 pct)	   1.11 (5.71 pct)
>   128	   1.08 (0.00 pct)	   1.08 (0.00 pct)	   1.15 (6.48 pct)
>   256	   1.12 (0.00 pct)	   1.12 (0.00 pct)	   1.20 (7.14 pct)
>   512	   1.18 (0.00 pct)	   1.17 (-0.84 pct)	   1.26 (6.77 pct)
> 
> ================ git-source comparisons ================
> git-source result comparison:
> Here results are throughput (compilations per 1000 sec)
> Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>   192	   1.00 (0.00 pct)	   0.93 (-7.00 pct)	   1.00 (0.00 pct)
> git-source power comparison:
> Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>   192	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   0.96 (-4.00 pct)
> 
> ================ kernbench comparisons ================
> kernbench result comparison:
> Here results are throughput (compilations per 1000 sec)
> Load:	   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> 32	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
> 48	   1.26 (0.00 pct)	   1.28 (1.58 pct)	   1.25 (-0.79 pct)
> 64	   1.39 (0.00 pct)	   1.47 (5.75 pct)	   1.43 (2.87 pct)
> 96	   1.48 (0.00 pct)	   1.50 (1.35 pct)	   1.49 (0.67 pct)
> 128	   1.29 (0.00 pct)	   1.32 (2.32 pct)	   1.33 (3.10 pct)
> 192	   1.17 (0.00 pct)	   1.20 (2.56 pct)	   1.21 (3.41 pct)
> 256	   1.17 (0.00 pct)	   1.18 (0.85 pct)	   1.20 (2.56 pct)
> 384	   1.16 (0.00 pct)	   1.17 (0.86 pct)	   1.21 (4.31 pct)
> kernbench power comparison:
> Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>    32	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.00 (0.00 pct)
>    48	   0.87 (0.00 pct)	   0.81 (-6.89 pct)	   0.88 (1.14 pct)
>    64	   0.81 (0.00 pct)	   0.73 (-9.87 pct)	   0.77 (-4.93 pct)
>    96	   0.75 (0.00 pct)	   0.74 (-1.33 pct)	   0.75 (0.00 pct)
>   128	   0.83 (0.00 pct)	   0.79 (-4.81 pct)	   0.83 (0.00 pct)
>   192	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
>   256	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
>   384	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
> 
> ================ tbench comparisons ================
> tbench result comparison:
> Here results are throughput (MB/s)
> Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>     1	   1.00 (0.00 pct)	   0.70 (-30.00 pct)	   1.37 (37.00 pct)
>     2	   2.64 (0.00 pct)	   1.39 (-47.34 pct)	   2.70 (2.27 pct)
>     4	   4.89 (0.00 pct)	   2.75 (-43.76 pct)	   5.28 (7.97 pct)
>     8	   9.46 (0.00 pct)	   5.42 (-42.70 pct)	  10.22 (8.03 pct)
>    16	  19.05 (0.00 pct)	  10.42 (-45.30 pct)	  19.94 (4.67 pct)
>    32	  37.50 (0.00 pct)	  20.23 (-46.05 pct)	  36.87 (-1.68 pct)
>    64	  61.24 (0.00 pct)	  43.08 (-29.65 pct)	  62.96 (2.80 pct)
>   128	  67.16 (0.00 pct)	  69.08 (2.85 pct)	  67.34 (0.26 pct)
>   256	 154.59 (0.00 pct)	 162.33 (5.00 pct)	 156.78 (1.41 pct)
>   512	 154.02 (0.00 pct)	 156.74 (1.76 pct)	 153.48 (-0.35 pct)
> tbench power comparison:
> Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
>     1	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.08 (8.00 pct)
>     2	   1.04 (0.00 pct)	   0.97 (-6.73 pct)	   1.11 (6.73 pct)
>     4	   1.12 (0.00 pct)	   0.99 (-11.60 pct)	   1.18 (5.35 pct)
>     8	   1.25 (0.00 pct)	   1.04 (-16.80 pct)	   1.31 (4.80 pct)
>    16	   1.53 (0.00 pct)	   1.13 (-26.14 pct)	   1.58 (3.26 pct)
>    32	   2.01 (0.00 pct)	   1.36 (-32.33 pct)	   2.03 (0.99 pct)
>    64	   2.58 (0.00 pct)	   2.14 (-17.05 pct)	   2.61 (1.16 pct)
>   128	   2.80 (0.00 pct)	   2.81 (0.35 pct)	   2.81 (0.35 pct)
>   256	   3.39 (0.00 pct)	   3.43 (1.17 pct)	   3.42 (0.88 pct)
>   512	   3.44 (0.00 pct)	   3.44 (0.00 pct)	   3.44 (0.00 pct)
> 
> Note: this series is based on top of EPP v11 [3] series

Hi Wyes,

Can you rebase this patchset onto the newest EPP v12 series [1] ?

[1] https://lore.kernel.org/linux-pm/20230131090016.3970625-1-perry.yuan@amd.com/

Cheers,
Tor Vic

> 
> Change log:
> 
> v3 -> v4:
> - Fixed active mode low frequency issue reported by Peter Jung and Tor Vic
> - Documentation modification suggested by Bagas Sanjaya
> 
> v2 -> v3:
> - Addressed review comments form Mario.
> - Picked up RB tag from Mario.
> - Rebase on top of EPP v11 [3].
> 
> v1 -> v2:
> - Fix issue with shared mem systems.
> - Rebase on top of EPP series.
> 
> [1]: https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf
> [2]: https://lore.kernel.org/lkml/20221110175847.3098728-1-Perry.Yuan@amd.com/
> [3]: https://lore.kernel.org/linux-pm/20230118075210.447418-1-perry.yuan@amd.com/
> 
> Wyes Karny (6):
>   acpi: cppc: Add min and max perf reg writing support
>   acpi: cppc: Add auto select register read/write support
>   cpufreq: amd_pstate: Add guided autonomous mode
>   Documentation: amd_pstate: Move amd_pstate param to alphabetical order
>   cpufreq: amd_pstate: Add guided mode control support via sysfs
>   Documentation: amd_pstate: Update amd_pstate status sysfs for guided
> 
>  .../admin-guide/kernel-parameters.txt         |  41 ++--
>  Documentation/admin-guide/pm/amd-pstate.rst   |  31 ++-
>  drivers/acpi/cppc_acpi.c                      | 121 +++++++++++-
>  drivers/cpufreq/amd-pstate.c                  | 184 +++++++++++++-----
>  include/acpi/cppc_acpi.h                      |  11 ++
>  include/linux/amd-pstate.h                    |   2 +
>  6 files changed, 309 insertions(+), 81 deletions(-)
> 
> -- 
> 2.34.1
Oleksandr Natalenko Jan. 31, 2023, 3:13 p.m. UTC | #2 
Hello.

On úterý 31. ledna 2023 11:37:51 CET torvic9@mailbox.org wrote:
> Can you rebase this patchset onto the newest EPP v12 series [1] ?
> 
> [1] https://lore.kernel.org/linux-pm/20230131090016.3970625-1-perry.yuan@amd.com/

You may consider trying my rebase here: [1].

This commit applies to v11+v3 series. I hope I didn't miss anything.

If interested, please let me know whether it works for you.

Thanks.

[1] https://codeberg.org/pf-kernel/linux/commit/438525b8029b23967722e9c7af97c6b8deb25029
Tor Vic Jan. 31, 2023, 4:12 p.m. UTC | #3 
> Oleksandr Natalenko <oleksandr@natalenko.name> hat am 31.01.2023 15:13 GMT geschrieben:
> 
>  
> Hello.

Hi,

> 
> On úterý 31. ledna 2023 11:37:51 CET torvic9@mailbox.org wrote:
> > Can you rebase this patchset onto the newest EPP v12 series [1] ?
> > 
> > [1] https://lore.kernel.org/linux-pm/20230131090016.3970625-1-perry.yuan@amd.com/
> 
> You may consider trying my rebase here: [1].
> 
> This commit applies to v11+v3 series. I hope I didn't miss anything.
> 
> If interested, please let me know whether it works for you.

Thank you for your work. I rebased it myself in the meantime.

> 
> Thanks.
> 
> [1] https://codeberg.org/pf-kernel/linux/commit/438525b8029b23967722e9c7af97c6b8deb25029
> 
> -- 
> Oleksandr Natalenko (post-factum)
Wyes Karny Jan. 31, 2023, 5:50 p.m. UTC | #4 
On 31 Jan 11:37, torvic9@mailbox.org wrote:
> 
> > Wyes Karny <wyes.karny@amd.com> hat am 31.01.2023 05:21 GMT geschrieben:
> > 
> >  
> > From ACPI spec[1] below 3 modes for CPPC can be defined:
> > 1. Non autonomous: OS scaling governor specifies operating frequency/
> >    performance level through `Desired Performance` register and platform
> > follows that.
> > 2. Guided autonomous: OS scaling governor specifies min and max
> >    frequencies/ performance levels through `Minimum Performance` and
> > `Maximum Performance` register, and platform can autonomously select an
> > operating frequency in this range.
> > 3. Fully autonomous: OS only hints (via EPP) to platform for the required
> >    energy performance preference for the workload and platform autonomously
> > scales the frequency.
> > 
> > Currently (1) is supported by amd_pstate as passive mode, and (3) is
> > implemented by EPP support[2]. This change is to support (2).
> > 
> > In guided autonomous mode the min_perf is based on the input from the
> > scaling governor. For example, in case of schedutil this value depends
> > on the current utilization. And max_perf is set to max capacity.
> > 
> > To activate guided auto mode ``amd_pstate=guided`` command line
> > parameter has to be passed in the kernel.
> > 
> > Below are the results (normalized) of benchmarks with this patch:
> > System: Genoa 96C 192T
> > Kernel: 6.2.0-rc2 + EPP v11 + patch
> > Scaling governor: schedutil
> > 
> > ================ dbench comparisons ================
> > dbench result comparison:
> > Here results are throughput (MB/s)
> > Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >     1	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
> >     2	   1.07 (0.00 pct)	   1.06 (-0.93 pct)	   1.07 (0.00 pct)
> >     4	   1.68 (0.00 pct)	   1.70 (1.19 pct)	   1.72 (2.38 pct)
> >     8	   2.61 (0.00 pct)	   2.68 (2.68 pct)	   2.76 (5.74 pct)
> >    16	   4.16 (0.00 pct)	   4.24 (1.92 pct)	   4.53 (8.89 pct)
> >    32	   5.98 (0.00 pct)	   6.17 (3.17 pct)	   7.30 (22.07 pct)
> >    64	   8.67 (0.00 pct)	   8.99 (3.69 pct)	  10.71 (23.52 pct)
> >   128	  11.98 (0.00 pct)	  12.52 (4.50 pct)	  14.67 (22.45 pct)
> >   256	  15.73 (0.00 pct)	  16.13 (2.54 pct)	  17.81 (13.22 pct)
> >   512	  15.77 (0.00 pct)	  16.32 (3.48 pct)	  16.39 (3.93 pct)
> > dbench power comparison:
> > Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >     1	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   1.04 (4.00 pct)
> >     2	   0.99 (0.00 pct)	   0.97 (-2.02 pct)	   1.02 (3.03 pct)
> >     4	   0.98 (0.00 pct)	   0.98 (0.00 pct)	   1.02 (4.08 pct)
> >     8	   0.98 (0.00 pct)	   0.99 (1.02 pct)	   1.02 (4.08 pct)
> >    16	   0.99 (0.00 pct)	   1.00 (1.01 pct)	   1.04 (5.05 pct)
> >    32	   1.02 (0.00 pct)	   1.02 (0.00 pct)	   1.07 (4.90 pct)
> >    64	   1.05 (0.00 pct)	   1.05 (0.00 pct)	   1.11 (5.71 pct)
> >   128	   1.08 (0.00 pct)	   1.08 (0.00 pct)	   1.15 (6.48 pct)
> >   256	   1.12 (0.00 pct)	   1.12 (0.00 pct)	   1.20 (7.14 pct)
> >   512	   1.18 (0.00 pct)	   1.17 (-0.84 pct)	   1.26 (6.77 pct)
> > 
> > ================ git-source comparisons ================
> > git-source result comparison:
> > Here results are throughput (compilations per 1000 sec)
> > Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >   192	   1.00 (0.00 pct)	   0.93 (-7.00 pct)	   1.00 (0.00 pct)
> > git-source power comparison:
> > Threads:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >   192	   1.00 (0.00 pct)	   1.00 (0.00 pct)	   0.96 (-4.00 pct)
> > 
> > ================ kernbench comparisons ================
> > kernbench result comparison:
> > Here results are throughput (compilations per 1000 sec)
> > Load:	   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> > 32	   1.00 (0.00 pct)	   1.01 (1.00 pct)	   1.02 (2.00 pct)
> > 48	   1.26 (0.00 pct)	   1.28 (1.58 pct)	   1.25 (-0.79 pct)
> > 64	   1.39 (0.00 pct)	   1.47 (5.75 pct)	   1.43 (2.87 pct)
> > 96	   1.48 (0.00 pct)	   1.50 (1.35 pct)	   1.49 (0.67 pct)
> > 128	   1.29 (0.00 pct)	   1.32 (2.32 pct)	   1.33 (3.10 pct)
> > 192	   1.17 (0.00 pct)	   1.20 (2.56 pct)	   1.21 (3.41 pct)
> > 256	   1.17 (0.00 pct)	   1.18 (0.85 pct)	   1.20 (2.56 pct)
> > 384	   1.16 (0.00 pct)	   1.17 (0.86 pct)	   1.21 (4.31 pct)
> > kernbench power comparison:
> > Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >    32	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.00 (0.00 pct)
> >    48	   0.87 (0.00 pct)	   0.81 (-6.89 pct)	   0.88 (1.14 pct)
> >    64	   0.81 (0.00 pct)	   0.73 (-9.87 pct)	   0.77 (-4.93 pct)
> >    96	   0.75 (0.00 pct)	   0.74 (-1.33 pct)	   0.75 (0.00 pct)
> >   128	   0.83 (0.00 pct)	   0.79 (-4.81 pct)	   0.83 (0.00 pct)
> >   192	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
> >   256	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
> >   384	   0.92 (0.00 pct)	   0.88 (-4.34 pct)	   0.92 (0.00 pct)
> > 
> > ================ tbench comparisons ================
> > tbench result comparison:
> > Here results are throughput (MB/s)
> > Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >     1	   1.00 (0.00 pct)	   0.70 (-30.00 pct)	   1.37 (37.00 pct)
> >     2	   2.64 (0.00 pct)	   1.39 (-47.34 pct)	   2.70 (2.27 pct)
> >     4	   4.89 (0.00 pct)	   2.75 (-43.76 pct)	   5.28 (7.97 pct)
> >     8	   9.46 (0.00 pct)	   5.42 (-42.70 pct)	  10.22 (8.03 pct)
> >    16	  19.05 (0.00 pct)	  10.42 (-45.30 pct)	  19.94 (4.67 pct)
> >    32	  37.50 (0.00 pct)	  20.23 (-46.05 pct)	  36.87 (-1.68 pct)
> >    64	  61.24 (0.00 pct)	  43.08 (-29.65 pct)	  62.96 (2.80 pct)
> >   128	  67.16 (0.00 pct)	  69.08 (2.85 pct)	  67.34 (0.26 pct)
> >   256	 154.59 (0.00 pct)	 162.33 (5.00 pct)	 156.78 (1.41 pct)
> >   512	 154.02 (0.00 pct)	 156.74 (1.76 pct)	 153.48 (-0.35 pct)
> > tbench power comparison:
> > Clients:   acpi-cpufreq		   amd_pst+passive	   amd_pst+guided
> >     1	   1.00 (0.00 pct)	   0.97 (-3.00 pct)	   1.08 (8.00 pct)
> >     2	   1.04 (0.00 pct)	   0.97 (-6.73 pct)	   1.11 (6.73 pct)
> >     4	   1.12 (0.00 pct)	   0.99 (-11.60 pct)	   1.18 (5.35 pct)
> >     8	   1.25 (0.00 pct)	   1.04 (-16.80 pct)	   1.31 (4.80 pct)
> >    16	   1.53 (0.00 pct)	   1.13 (-26.14 pct)	   1.58 (3.26 pct)
> >    32	   2.01 (0.00 pct)	   1.36 (-32.33 pct)	   2.03 (0.99 pct)
> >    64	   2.58 (0.00 pct)	   2.14 (-17.05 pct)	   2.61 (1.16 pct)
> >   128	   2.80 (0.00 pct)	   2.81 (0.35 pct)	   2.81 (0.35 pct)
> >   256	   3.39 (0.00 pct)	   3.43 (1.17 pct)	   3.42 (0.88 pct)
> >   512	   3.44 (0.00 pct)	   3.44 (0.00 pct)	   3.44 (0.00 pct)
> > 
> > Note: this series is based on top of EPP v11 [3] series
> 
> Hi Wyes,
> 
> Can you rebase this patchset onto the newest EPP v12 series [1] ?

Sure, I'll rebase this on top of EPP v12.

Thanks,
Wyes

> 
> [1] https://lore.kernel.org/linux-pm/20230131090016.3970625-1-perry.yuan@amd.com/
> 
> Cheers,
> Tor Vic
> 
> > 
> > Change log:
> > 
> > v3 -> v4:
> > - Fixed active mode low frequency issue reported by Peter Jung and Tor Vic
> > - Documentation modification suggested by Bagas Sanjaya
> > 
> > v2 -> v3:
> > - Addressed review comments form Mario.
> > - Picked up RB tag from Mario.
> > - Rebase on top of EPP v11 [3].
> > 
> > v1 -> v2:
> > - Fix issue with shared mem systems.
> > - Rebase on top of EPP series.
> > 
> > [1]: https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf
> > [2]: https://lore.kernel.org/lkml/20221110175847.3098728-1-Perry.Yuan@amd.com/
> > [3]: https://lore.kernel.org/linux-pm/20230118075210.447418-1-perry.yuan@amd.com/
> > 
> > Wyes Karny (6):
> >   acpi: cppc: Add min and max perf reg writing support
> >   acpi: cppc: Add auto select register read/write support
> >   cpufreq: amd_pstate: Add guided autonomous mode
> >   Documentation: amd_pstate: Move amd_pstate param to alphabetical order
> >   cpufreq: amd_pstate: Add guided mode control support via sysfs
> >   Documentation: amd_pstate: Update amd_pstate status sysfs for guided
> > 
> >  .../admin-guide/kernel-parameters.txt         |  41 ++--
> >  Documentation/admin-guide/pm/amd-pstate.rst   |  31 ++-
> >  drivers/acpi/cppc_acpi.c                      | 121 +++++++++++-
> >  drivers/cpufreq/amd-pstate.c                  | 184 +++++++++++++-----
> >  include/acpi/cppc_acpi.h                      |  11 ++
> >  include/linux/amd-pstate.h                    |   2 +
> >  6 files changed, 309 insertions(+), 81 deletions(-)
> > 
> > -- 
> > 2.34.1