RE: [Xen-users] "BUG: soft lockup detected on CPU#n", results in very slow domU's

["Ross S. W. Walker" <RWalker@xxxxxxxxxxxxx>]

Rink Springer wrote:
> 
> Hello,
> 
> Recently, I've installed Xen 3.2 (fresh from Mercurial) on a Compaq
> Proliant DL580 machine with 4x 700MHz Pentium III Xeon CPU's and 4GB of
> RAM. However, whenever I boot Xen, I see the following messages in my
> dom0's dmesg:
> 
<snip soft lockup output>
> 
> The result is that whenever I launch a domU, it regularly freezes until
> I hit some key; for example, holding spacebar allows the domU to boot,
> otherwise it just pauses during startup scripts :-(
> 
> I've seen this behaviour with Xen 3.0, 3.1 and 3.2; I'm using Debian 4.0
> with self-built Xen 3.2, which runs kernel 2.6.18.8-xen.
> 
> Does anyone have a clue what is going on? The machine works fine without
> a Xen kernel...

Try with CPU scaling disabled in the BIOS, and/or upgrade your BIOS.

If not CPU scaling, then any other CPU idle throttling function.

-Ross

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