From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: Valdis.Kletnieks@vt.edu
Cc: linux-kernel@vger.kernel.org
Subject: Re: High pitch noise when ACPI processor module is loaded.
Date: Mon, 25 Jan 2010 04:56:02 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.00.1001250455360.4614@p34.internal.lan> (raw)
In-Reply-To: <alpine.DEB.2.00.1001250424540.4502@p34.internal.lan>
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.
next prev parent reply other threads:[~2010-01-25 9:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-23 15:48 Justin Piszcz
2010-01-23 20:12 ` Rafael J. Wysocki
2010-01-23 20:42 ` Robert Hancock
2010-01-25 5:34 ` Valdis.Kletnieks
2010-01-25 9:26 ` Justin Piszcz
2010-01-25 9:56 ` Justin Piszcz [this message]
2010-01-25 10:10 ` Ian Campbell
2010-01-25 20:46 ` Justin Piszcz
2010-01-25 22:38 ` Sitsofe Wheeler
2010-01-25 12:33 ` Henrique de Moraes Holschuh
2010-01-25 12:41 ` Justin Piszcz
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