linux-kernel - Re: [PATCH] perf/x86/rapl: Enable Core RAPL for AMD

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <803f7ef2-f217-65fe-d0b9-98ae469556fa@collabora.com>
Date:   Tue, 28 Feb 2023 19:20:48 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Stephane Eranian <eranian@...gle.com>,
        Wyes Karny <wyes.karny@....com>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, hpa@...or.com,
        x86@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, gautham.shenoy@....com,
        ananth.narayan@....com,
        "kernel@...labora.com" <kernel@...labora.com>
Subject: Re: [PATCH] perf/x86/rapl: Enable Core RAPL for AMD

On 2/21/23 1:50 PM, Stephane Eranian wrote:
> Hi,
> 
> Testing Wyes' patch for energy-cores on Zen3 server loaded with triad
> bench on socket0:
> 
> $ perf stat --per-core -a -C0-63 -I 1000 -e
> power/energy-cores/,power/energy-pkg/
> #           time core               cpus             counts   unit events
>      1.001019203 S0-D0-C0              1               1.28 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C0              1             231.38 Joules
> power/energy-pkg/
>      1.001019203 S0-D0-C1              1   4,294,967,130.96 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C1              1             231.38 Joules
> power/energy-pkg/
>      1.001019203 S0-D0-C2              1   4,294,967,126.23 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C2              1             231.38 Joules
> power/energy-pkg/
>      1.001019203 S0-D0-C3              1   4,294,967,122.50 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C3              1             231.38 Joules
> power/energy-pkg/
>      1.001019203 S0-D0-C4              1   4,294,967,129.92 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C4              1             231.38 Joules
> power/energy-pkg/
>      1.001019203 S0-D0-C5              1   4,294,967,121.49 Joules
> power/energy-cores/
>      1.001019203 S0-D0-C5              1             231.39 Joules
> power/energy-pkg/
> 
> I think the result of energy-cores is not reliable and I think that is
> why I did not
> include it in the patch.
> 
> Could also be a problem with the kernel code, but I don't know why it would only
> impact energy-cores given energy-pkg looks reasonable here.
> 

I'm getting consistent per core energy measurements on AMD Custom APU 405.
Probably consistency depends on the chip.

sudo perf stat -a --per-core -C 0-7 -e power/energy-cores/

 Performance counter stats for 'system wide':

 S0-D0-C0           2               0.51 Joules power/energy-cores/
 S0-D0-C1           2               0.51 Joules power/energy-cores/
 S0-D0-C2           2               0.51 Joules power/energy-cores/
 S0-D0-C3           2               0.51 Joules power/energy-cores/

What is the fate of this patch now?

[..]

>>>> Stephane, this was an oversight?
>>>>
>>> I think it may depend on the CPU model. I remember it returning either
>>> 0 or bogus values on my systems. They may have improved that.
>>> The commit msg does not show which CPU model this is run on.
>>
>> I've tested this on Zen 2, 3 and 4 server systems.
>>
>> Thanks,
>> Wyes

-- 
BR,
Muhammad Usama Anjum