Re: [PATCH 1/3 v7] hwmon: Add amd_energy driver to report energy counters

[Naveen Krishna Ch <naveenkrishna.ch@gmail.com>]

Hi Alexander

On Wed, 27 May 2020 at 22:29, Alexander Monakov <amonakov@ispras.ru> wrote:
>
> On Wed, 27 May 2020, Naveen Krishna Ch wrote:
>
> > I tried on an octa core machine, must be Renoir
> > vendor_id       : AuthenticAMD
> > cpu family      : 23
> > model           : 96
>
> Yes, same here. The only difference I'm on a 6-core 4500U.
>
> > On an idle system over a period of 500secs:
> [snip]
> > Power consumed by socket: 4.53539685 W
> > Sum of power consumed by cores: 0.010953W
>
> Yes, no problem for idle readings. I'm getting 2W/package on AC and
> close to 0W on battery.
>
>
> > On an system with AVX test running over a period of 500 secs:
> >
> >                  At t=500sec    | At t= 0           | Diff of energy
> >  | in Joules        | Power in Watts
> > core 0     | 649348495     | 413687530    | 235660965       |
> > 235.660965   | 0.47132193
> > core 1     | 506880081     | 294882827    | 211997254       |
> > 211.997254    | 0.423994508
> > core 2     | 454804046     | 271046127    | 183757919       |
> > 183.757919    | 0.367515838
> > core 3     | 391508712     | 237531021    | 153977691       |
> > 153.977691    | 0.307955382
> > core 4     | 410336868     | 284410079    | 125926789       |
> > 125.926789    | 0.251853578
> > core 5     | 287569732     | 192306015    | 95263717         |
> > 95.263717      | 0.190527434
> > core 6     | 185909622     | 120556152    | 65353470         |
> > 65.35347        | 0.13070694
> > core 7     | 129932006     | 95385940      | 34546066         |
> > 34.546066      | 0.069092132
> > Socket 0 | 28399099655 |  24799819931 3599279724     | 3599.27972    |
> > 7.198559448
> > Power consumed by socket: 7.198559448 W
> > Sum of power consumed by cores:  2.212968 W
> >
> > Can you confirm this.
>
> No, this isn't right. The workload is not stressing all cores, you're
> reporting 235 J for core 0 and only 35 J for core 7.
>
> If you are running the avx-turbo test, please run it like this:
>
>   ./avx-turbo --iters 10000000 --spec avx256_fma_t/8
>
> This will run AVX code on all 8 cores for about 1 second. To run it for longer,
> increase the --iters argument.
I ran with all cores loaded now and i see that
sum of diff of energy consumed by all cores is greater than the diff of
socket energy consumed in 100secs.

Kindly, give me time. I will come back with some explanation or solution.
>
> Thanks.
> Alexander



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