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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 14 Oct 2009 23:05:58 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: System (motherboard/CPU?) emits high pitch noise when
	processor.ko is loaded.

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/