linux-kernel - Re: AMD Bobcat cpufreq

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Message-ID: <26801338.9419821382109781265.JavaMail.jza@saunalahti.fi>
Date:	Fri, 18 Oct 2013 18:23:01 +0300 (EEST)
From:	Joonas Saarinen <jza@...nalahti.fi>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: AMD Bobcat cpufreq

Borislav Petkov [bp@...en8.de] wrote:
> You can also try turbostat in tools/power/x86/turbostat/
> 
> # ./turbostat -i 1

We might be on to something. With work pinned on one core:

cor CPU   GHz  TSC
        1.16 1.00
  0   0 1.17 1.00
  1   1 0.80 1.00

When both cores are occupied:

cor CPU   GHz  TSC
        1.00 1.00
  0   0 1.00 1.00
  1   1 1.00 1.00

In this case both cores are limited to 1GHz, but it might be intentional
to avoid overheating.

So there is some turbo functionality indeed. The frequency shown by 
turbostat is still a bit off the target, not sure if there is any actual
problem though.

Joonas

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