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SubjectRe: turbostat: Display all C-states on AMD Ryzen processor
Hi Paul,
Thanks for the note.
This devices is exposing two C-states to the OS, via ACPI tables:

cpu7: C1: ACPI HLT
cpu7: C2: ACPI IOPORT 0x414

And turbostat is showing the kernel's count of requests into those
states, and %residency in those states.

So far, this is similar to what would be seen on most Intel parts,
except Intel usually expose a couple more states to the OS, often via
a native intel_idle driver, rather than the ACPI BIOS.

That part that is really missing from AMD is hardware residency
counters. I don't know if there are any or not. If somebody knows of
any that are publicly documented and is willing to test patches to
show them to the user, I'd be happy to cut patches.

cheers,
-Len

On Tue, Feb 11, 2020 at 6:18 AM Paul Menzel <pmenzel@molgen.mpg.de> wrote:
>
> Dear Len,
>
>
> Running `turbostat` on an AMD Ryzen 5 PRO 1500, I do not see all C-states.
>
> ```
> $ git describe
> v5.6-rc1
> $ sudo ./turbostat
> turbostat version 19.08.31 - Len Brown <lenb@kernel.org>
> CPUID(0): AuthenticAMD 0xd CPUID levels; 0x8000001f xlevels; family:model:stepping 0x17:1:1 (23:1:1)
> CPUID(1): SSE3 MONITOR - - - TSC MSR - HT -
> CPUID(6): APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, No-EPB
> CPUID(7): No-SGX
> RAPL: 262 sec. Joule Counter Range, at 250 Watts
> cpu7: POLL: CPUIDLE CORE POLL IDLE
> cpu7: C1: ACPI HLT
> cpu7: C2: ACPI IOPORT 0x414
> cpu7: cpufreq driver: acpi-cpufreq
> cpu7: cpufreq governor: performance
> cpufreq boost: 1
> cpu0: MSR_RAPL_PWR_UNIT: 0x000a1003 (0.125000 Watts, 0.000015 Joules, 0.000977 sec.)
> Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz IRQ POLL C1 C2 POLL% C1% C2% CorWatt PkgWatt
> - - 2 0.07 2973 3493 943 0 201 737 0.00 0.37 99.57 0.12 12.42
> 0 0 2 0.08 3005 3493 122 0 7 116 0.00 0.12 99.81 0.03 12.42
> 0 1 0 0.01 2998 3493 21 0 6 14 0.00 0.10 99.89
> 1 2 0 0.01 3036 3493 25 0 13 11 0.00 0.21 99.78 0.04
> 1 3 5 0.17 2960 3493 429 0 102 324 0.00 1.41 98.45
> 4 4 2 0.05 3015 3493 74 0 24 50 0.00 0.32 99.64 0.03
> 4 5 3 0.09 2921 3493 125 0 15 110 0.00 0.28 99.63
> 5 6 2 0.07 2978 3493 124 0 26 97 0.00 0.39 99.54 0.03
> 5 7 1 0.02 3012 3493 23 0 8 15 0.00 0.13 99.84
> ```
>
> On an Intel processor more C-states are shown. Is support just lacking
> on AMD, or should a different tool be used?
>
>
> Kind regards,
>
> Paul
>


--
Len Brown, Intel Open Source Technology Center

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