lkml.org 
[lkml]   [2009]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: High load average on idle machine running 2.6.32
James Pearson wrote:
> I've booted a 64 bit 2.6.32 kernel on dual processor, quad core Xeon
> E5440 machine. The load average when the machine is idle varies between
> 2 and 3.
>
> When using a 2.6.31 kernel on the same machine, the load average when
> idle is nearly 0
>
> The kernel doesn't use modules - all that is needed is compiled in. The
> machine uses NFS-root
>
> Strangely, when I run 'iftop' (from http://www.ex-parrot.com/pdw/iftop/)
> using the 2.6.32 kernel, the load average drops to below 0.5 - stop
> running iftop, and the load average climbs again ...
>
> Any idea what might be causing this?

It looks like whatever is causing this happened between 2.6.31-git7 and
2.6.31-git8 - unfortunately I don't know how to find out what change
caused this ...

Also, if I 'hot-unplug' CPUs 1 to 7, the load average drops to 0 - when
I re-enable theses CPUs, the load average climbs.

I guess this is a problem with my particular config - or maybe because
I'm using NFS-root (the root file system is readonly), or using a
non-module kernel?

Thanks

James Pearson


\
 
 \ /
  Last update: 2009-12-10 17:31    [W:0.316 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site