linux-kernel - Re: High pitch noise when ACPI processor module is loaded.

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Date:	Mon, 25 Jan 2010 04:56:02 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Valdis.Kletnieks@...edu
cc:	linux-kernel@...r.kernel.org
Subject: Re: High pitch noise when ACPI processor module is loaded.

On Mon, 25 Jan 2010, Justin Piszcz wrote:

> Hi,
>
> I think something else may be wrong?
>
> I switched my kernel config to 100 HZ and the problem persists.
>
> So the question remains, is it possible to utilize turbo boost (in Linux)
> without the high pitch noise from the ACPI processor module?
>
> Again, when the module is not loaded, no matter what HZ, there is no high 
> pitch noise.
>
> Justin.
>
>

Without ACPI processor module loaded, turbo boost never takes effect:

(turbostat)

  CPU   GHz    TSC    %c0    %c1    %c3    %c6   %pc3   %pc6   %pc7
    0   2.93   2.93   1.41  98.59   0.00   0.00   0.00   0.00   0.00
    1   2.93   2.93 100.00   0.00   0.00   0.00   0.00   0.00   0.00
    2   2.93   2.93   1.51  98.49   0.00   0.00   0.00   0.00   0.00
    3   2.93   2.93   0.97  99.03   0.00   0.00   0.00   0.00   0.00
    4   2.93   2.93   0.90  99.10   0.00   0.00   0.00   0.00   0.00
    5   2.93   2.93   0.34  99.66   0.00   0.00   0.00   0.00   0.00
    6   2.93   2.93   0.40  99.60   0.00   0.00   0.00   0.00   0.00
    7   2.93   2.93   3.07  96.93   0.00   0.00   0.00   0.00   0.00

With the module loaded, it works but there is a high pitch noise, again,
only under Linux, when the same benchmark (bzip2 a file) is run under windows
there is no high pitch noise:

  CPU   GHz    TSC    %c0    %c1    %c3    %c6   %pc3   %pc6   %pc7
    0   3.30   2.93   0.44   0.82  25.29  73.44   0.00   0.00   0.00
    1   3.33   2.93   0.24   1.02  25.29  73.44   0.00   0.00   0.00
    2   3.43   2.93   1.84   5.41  48.65  44.10   0.00   0.00   0.00
    3   3.41   2.93   0.49   6.76  48.65  44.10   0.00   0.00   0.00
    4   3.58   2.93  99.44   0.56   0.00   0.00   0.00   0.00   0.00
    5   3.43   2.93   0.03  99.97   0.00   0.00   0.00   0.00   0.00
    6   3.09   2.93   0.14   0.23  89.74   9.89   0.00   0.00   0.00
    7   2.13   2.93   0.01   0.36  89.74   9.89   0.00   0.00   0.00


Justin.


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