linux-kernel - Re: System (motherboard/CPU?) emits high pitch noise when processor.ko is loaded.

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Message-ID: <alpine.DEB.2.00.0910141803380.2653@p34.internal.lan>
Date:	Wed, 14 Oct 2009 18:04:32 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Andreas Mohr <andi@...as.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: System (motherboard/CPU?) emits high pitch noise when processor.ko
 is loaded.



On Wed, 14 Oct 2009, Andreas Mohr wrote:

> And that's news exactly how? ;)
> Systems and their switching regulators (and especially their backing
> coils) have been making noise for more than half a decade now,
> depending on which activities frequency is currently taking place
> on the system.
>
> OTOH this means that in your case, maybe some interval in the processor module
> (or somewhere related) is ill-chosen (leading to significant, audible differences
> between busy/idle state) and should be changed.
>
> For example, with HZ settings 100 can cause quite a bit of noise on some
> machines, whereas 1000 is better, IIRC. And that could be similar for some
> processing in this module.
>
> Andreas
>

Hi,

Ok, well I never had that happen before when loading that module-- 
although I never normally ran it except for testing purposes, so it was news
to me :)

CPU was i870 & mobo = DP55KG for reference and I use a HZ setting of 1000.

Justin.
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