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[Xen-devel] Migrated domUs hangs

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Migrated domUs hangs
From: Cédric Schieli <cschieli@xxxxxxxxx>
Date: Sat, 2 Oct 2010 14:22:04 +0200
Delivery-date: Sat, 02 Oct 2010 05:22:59 -0700
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I have a live migration problem on my setup. Migrated DomUs hang, but continue as normal when migrated back.

Both nodes are i386 Debian Squeeze dom0 (xen 4.0.1 + pvops0 2.6.32-5-xen-686)
Node A is a 32bits 2.4 Ghz Pentium4, node B is a 32bits 2.0 Ghz Celeron.

DomUs are Debian Squeeze (2.6.32-5-xen-686 >= 2.6.32-22 or 2.6.32-5-686-bigmem >= 2.6.32-22) and Ubuntu Maverick (2.6.35-22-generic-pae)
They will hang when migrated onto the node which has the lowest uptime, even if it is the node where the domain was initially created. If I migrate them back, they continue running as if nothing had happened.

Debian DomUs with 2.6.32-5-xen-686 = 2.6.32-21 don't have the problem. Reverting "x86, paravirt: Add a global synchronization point for pvclock" (489fb490dbf8dab0249ad82b56688ae3842a79e8) on Debian's 2.6.32-5-xen-686 = 2.6.32-23 also works.
And finally, passing clocksource=tsc to DomUs won't change anything.

Is this a known problem ? May it be specific to my setup ?

Cédric Schieli
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