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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

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?

 -George

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