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

On Thu, Oct 22, 2009 at 09:21:49PM -0700, 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.

Did you try with Xen 3.4.1 or the latest xen-3.4-testing.hg ?

There are a lot of fixes after 3.4.0 ..

-- Pasi

> Looking into the hypervisor thru kdb, I see one cpu in sh_resync_all()
> while all other 31 appear spinning on the shadow_lock. 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.
> Now that guests are getting bigger in memory, bugs of this nature are slowly
> popping up under medium/heavy load. I've been thinking of what could be
> done to adderss those in the long run. May be create a certain class of 
> pages, that once migrated, are 'w' protected, and any write faults on them 
> are resolved on the target system, is one idea.  Incidentally, IBM took 
> the reverse approach. The (VCPU) contexts are migrated and pages are 
> pulled in. 
> thanks,
> Mukesh
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