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Date: Mon, 17 Oct 2022 15:40:49 +0800
From: Huang Rui <ray.huang@....com>
To: "Yuan, Perry" <Perry.Yuan@....com>
Cc: "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
"Sharma, Deepak" <Deepak.Sharma@....com>,
"Limonciello, Mario" <Mario.Limonciello@....com>,
"Fontenot, Nathan" <Nathan.Fontenot@....com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Huang, Shimmer" <Shimmer.Huang@....com>,
"Du, Xiaojian" <Xiaojian.Du@....com>,
"Meng, Li (Jassmine)" <Li.Meng@....com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH V2 0/9] Implement AMD Pstate EPP Driver
On Tue, Oct 11, 2022 at 12:22:39AM +0800, Yuan, Perry wrote:
> Hi all,
>
> This patchset implements one new AMD CPU frequency driver
> "amd-pstate-epp” instance for better performance and power control.
> CPPC has a parameter called energy preference performance (EPP).
> The EPP is used in the CCLK DPM controller to drive the frequency that a core
> is going to operate during short periods of activity.
> EPP values will be utilized for different OS profiles (balanced, performance, power savings).
>
> AMD Energy Performance Preference (EPP) provides a hint to the hardware
> if software wants to bias toward performance (0x0) or energy efficiency (0xff)
> The lowlevel power firmware will calculate the runtime frequency according to the EPP preference
> value. So the EPP hint will impact the CPU cores frequency responsiveness.
>
> We use the RAPL interface with "perf" tool to get the energy data of the package power.
> Performance Per Watt (PPW) Calculation:
>
> The PPW calculation is referred by below paper:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsoftware.intel.com%2Fcontent%2Fdam%2Fdevelop%2Fexternal%2Fus%2Fen%2Fdocuments%2Fperformance-per-what-paper.pdf&data=04%7C01%7CPerry.Yuan%40amd.com%7Cac66e8ce98044e9b062708d9ab47c8d8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637729147708574423%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=TPOvCE%2Frbb0ptBreWNxHqOi9YnVhcHGKG88vviDLb00%3D&reserved=0
>
> Below formula is referred from below spec to measure the PPW:
>
> (F / t) / P = F * t / (t * E) = F / E,
>
> "F" is the number of frames per second.
> "P" is power measured in watts.
> "E" is energy measured in joules.
>
> Gitsouce Benchmark Data on ROME Server CPU
> +------------------------------+------------------------------+------------+------------------+
> | Kernel Module | PPW (1 / s * J) |Energy(J) | PPW Improvement (%)|
> +==============================+==============================+============+==================+
> | acpi-cpufreq:schedutil | 5.85658E-05 | 17074.8 | base |
> +------------------------------+------------------------------+------------+------------------+
> | acpi-cpufreq:ondemand | 5.03079E-05 | 19877.6 | -14.10% |
> +------------------------------+------------------------------+------------+------------------+
> | acpi-cpufreq:performance | 5.88132E-05 | 17003 | 0.42% |
> +------------------------------+------------------------------+------------+------------------+
> | amd-pstate:ondemand | 4.60295E-05 | 21725.2 | -21.41% |
> +------------------------------+------------------------------+------------+------------------+
> | amd-pstate:schedutil | 4.70026E-05 | 21275.4 | -19.7% |
> +------------------------------+------------------------------+------------+------------------+
> | amd-pstate:performance | 5.80094E-05 | 17238.6 | -0.95% |
> +------------------------------+------------------------------+------------+------------------+
> | EPP:performance | 5.8292E-05 | 17155 | -0.47% |
> +------------------------------+------------------------------+------------+------------------+
> | EPP: balance performance: | 6.71709E-05 | 14887.4 | 14.69% |
> +------------------------------+------------------------------+------------+------------------+
> | EPP:power | 6.66951E-05 | 4993.6 | 13.88% |
> +------------------------------+------------------------------+------------+------------------+
>
> Tbench Benchmark Data on ROME Server CPU
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | Kernel Module | PPW MB / (s * J) |Throughput(MB/s)| Energy (J)|PPW Improvement(%)|
> +=============================================+===================+==============+=============+==================+
> | acpi_cpufreq: schedutil | 46.39 | 17191 | 37057.3 | base |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | acpi_cpufreq: ondemand | 51.51 | 19269.5 | 37406.5 | 11.04 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | acpi_cpufreq: performance | 45.96 | 17063.7 | 37123.7 | -0.74 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | EPP:powersave: performance(0) | 54.46 | 20263.1 | 37205 | 17.87 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | EPP:powersave: balance performance | 55.03 | 20481.9 | 37221.5 | 19.14 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | EPP:powersave: balance_power | 54.43 | 20245.9 | 37194.2 | 17.77 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | EPP:powersave: power(255) | 54.26 | 20181.7 | 37197.4 | 17.40 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | amd-pstate: schedutil | 48.22 | 17844.9 | 37006.6 | 3.80 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | amd-pstate: ondemand | 61.30 | 22988 | 37503.4 | 33.72 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
> | amd-pstate: performance | 54.52 | 20252.6 | 37147.8 | 17.81 % |
> +---------------------------------------------+-------------------+--------------+-------------+------------------+
>
Please add the test cycle number in the average test result.
Since Jasmine has submitted the TBench and Gitsource benchmark test suite
into amd-pstate-ut test module, I suggest to align the test script and make
sure everybody can use that script to get the similar accurate performance
per watt data even on the EPP mode.
https://lore.kernel.org/lkml/20220914061105.1982477-1-li.meng@amd.com/
Thanks,
Ray
> changes from v1:
> * rebased to v6.0
> * drive feedbacks from Mario for the suspend/resume patch
> * drive feedbacks from Nathan for the EPP support on msr type
> * fix some typos and code style indent problems
> * update commit comments for patch 4/7
> * change the `epp_enabled` module param name to `epp`
> * set the default epp mode to be false
> * add testing for the x86_energy_perf_policy utility patchset(will
> send that utility patchset with another thread)
>
> Perry Yuan (9):
> ACPI: CPPC: Add AMD pstate energy performance preference cppc control
> cpufreq: amd_pstate: add module parameter to load amd pstate EPP
> driver
> cpufreq: cpufreq: export cpufreq cpu release and acquire
> x86/msr: Add the MSR definition for AMD CPPC boost state
> Documentation: amd-pstate: add EPP profiles introduction
> cpufreq: amd_pstate: add AMD pstate EPP support for shared memory type
> processor
> cpufreq: amd_pstate: add AMD Pstate EPP support for the MSR based
> processors
> cpufreq: amd_pstate: implement amd pstate cpu online and offline
> callback
> cpufreq: amd-pstate: implement suspend and resume callbacks
>
> Documentation/admin-guide/pm/amd-pstate.rst | 19 +
> arch/x86/include/asm/msr-index.h | 7 +
> drivers/acpi/cppc_acpi.c | 128 ++-
> drivers/cpufreq/amd-pstate.c | 949 +++++++++++++++++++-
> drivers/cpufreq/cpufreq.c | 2 +
> include/acpi/cppc_acpi.h | 17 +
> 6 files changed, 1115 insertions(+), 7 deletions(-)
>
> --
> 2.34.1
>
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