linux-kernel - Re: AMD Bobcat cpufreq

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Message-ID: <20131018133630.GD1007@pd.tnic>
Date:	Fri, 18 Oct 2013 15:36:30 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Joonas Saarinen <jza@...nalahti.fi>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: AMD Bobcat cpufreq

On Fri, Oct 18, 2013 at 04:19:49PM +0300, Joonas Saarinen wrote:
> It's promising that the boost state support is "supported and
> active" but the output is still kind of sparse. There's no mention
> about specific turbo states,

could be bug in the tool...

> nor do I get /proc/cpuinfo or that cpupower tool ever to show an
> evidence that the CPU is going to 1333MHz. On Windows CPU-Z showed it
> constantly visiting that state.

You can also try turbostat in tools/power/x86/turbostat/

# ./turbostat -i 1

to give you core freq. readout every second and then pin a workload on
one core in another shell, say kernel build:

$ taskset 1 make

You should be able to see core 0 boosting like in my case:

cor CPU   GHz  TSC
        3.90 4.01
  0   0 4.17 4.01
  1   1 4.17 4.01
  2   2 2.23 4.01
  3   3 2.74 4.01
  4   4 1.83 4.01
  5   5 3.23 4.01
  6   6 1.69 4.01
  7   7 1.43 4.01

cores 0 and 1 go over 4GHz which is their boosted state.

HTH.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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