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Re: [Xen-devel] soft lockups during live migrate..

On Fri, 23 Oct 2009 11:09:36 +0100
Tim Deegan <Tim.Deegan@xxxxxxxxxx> wrote:

> At 05:21 +0100 on 23 Oct (1256275309), Mukesh Rathor wrote:
> > Trying to migrate a 64bit PV guest with 64GB running medium to
> > heavy load on xen 3.4.0, it is showing lot of soft lockups. The
> > softlockups are causing dom0 reboot by the cluster FS. The hardware
> > has 256GB and 32 CPUs.
> > 
> > Looking into the hypervisor thru kdb, I see one cpu in
> > sh_resync_all() while all other 31 appear spinning on the
> > shadow_lock.
> How many vcpus does the guest have?  Scalability issues in the OOS
> shadow code are more related to number of VCPUs than amount of RAM.

Actually, things are fine with 32GB/32vcpus. Problem happens with
64GB/32vcpus. Trying the unstable version now.

> > I vaguely remember
> > seeing some thread on this while ago, but just can't seem to google
> > find it now. I'm trying to figure what could be done in the short
> > run.
> The solution (for BS2000) was to plumb in a flag that disabled the OOS
> code for particular domains. 
> Tim.

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