Re: [Xen-devel] HVM Migration of domU on Qemu-upstream DM causes stuck system clock with ACPI

[Diana Crisan <dcrisan@xxxxxxxxxxxx>]

On 30/05/13 15:32, George Dunlap wrote:
> On Tue, May 14, 2013 at 2:11 PM, Diana Crisan <dcrisan@xxxxxxxxxxxx> wrote:
> > This is problem 1 of 3 problems we are having with live migration and/or ACPI 
> > on Xen-4.3 and Xen-4.2.
> >
> > Any help would be appreciated.
> >
> > Detailed description of problem:
> >
> > We are using Xen-4.3-rc1 with dom0 running Ubuntu Precise and 3.5.0-23-generic 
> > kernel, and domU running Ubuntu Precise (12.04) cloud images running 
> > 3.2.0-39-virtual. We are using the xl.conf below on qemu-upstream-dm and HVM 
> > and two identical sending and receiving machines (hardware and software)
> >
> > When live migration is instigated between two identical hardware configurations 
> > using 'xl migrate', the migrate completes but the system clock in domU appears 
> > to be stuck when the domU resumes on the receiving side. For instance, running 
> > 'top', 'date', or 'uptime' will constantly report the same result. The clocks 
> > in dom0 were synchronized before migration using ntpdate. A modification of the 
> > clock using the date command in the migrated domU solves the problem; migrating 
> > back to the original machine works, but after a third migration the problem 
> > reappears.
> >
> > Sometimes the clock is not stuck on the first migrate, but the problem is 
> > reproducible after several migrations.
> >
> > How to replicate:
> >
> > 1. Take two machines with identical hardware and software, running the 
> > xen-4.3-rc1 version of Xen on Ubuntu Precise with 3.5.0-23-generic kernel.
> > 2. Use the xl.conf below as a configuration file.
> > 3. Create a VM using Ubuntu Precise and 3.5.0-23 generic.
> Sorry, one question -- here you have 3.5.0-23, but above you say that
> you're using 3.2.0-39-virtual?  What OS is the guest running?
Sorry for the misunderstanding.
The host is 3.5.0-23-generic and the guest is 3.2.0-39-virtual
>   -George
--
Diana

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