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-   -   Bug#426692: One CPU slow down with kernel 2.6.18-4-686 (etch2) (http://www.linux-archive.org/debian-kernel/218540-bug-426692-one-cpu-slow-down-kernel-2-6-18-4-686-etch2.html)

Moritz Muehlenhoff 12-25-2008 03:12 PM

Bug#426692: One CPU slow down with kernel 2.6.18-4-686 (etch2)
 
On Wed, May 30, 2007 at 11:42:21AM +0200, Unas Mérnöki Iroda wrote:
> Package: linux-image
> Version: 2.6.18-4-686 (etch2)
>
> I have a dual xeon system with 2 xeon 5050 dual core processors with HyperTreading.
> Sometimes one of the physical cores slow down and never speed up again. There is
> a lot of "system" and "user" load (~80-90%) and a lot of "soft irq" (~20-30%) on
> that CPU (on 2 virtual CPU because of HyperTreading). When a process running on
> the slow CPU it finished approximately 10 times slower than on one of the other CPUs.
>
> The slow CPU speed up only when I reboot the system.
>
> I am using Debian GNU/Linux 4.0, kernel 2.6.18-4-686 (etch2).
> Used packages: apache2, bind9, postfix, courier, mysql, proftpd, etc...
> I am not using x-window.

Does this error still occur with more recent kernel versions?

If you're running Etch, could you try to reproduce this bug
with the 2.6.24 based kernel added in 4.0r4?
http://packages.qa.debian.org/l/linux-2.6.24.html

Cheers,
Moritz



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