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Re: [Xen-devel] reliable live migration of large and busy guests

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Tuesday, November 06, 2012 4:19 PM
> To: xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] reliable live migration of large and busy guests
> As potential food for thought:
> Is there wisdom in having a new kind of live migrate which, when pausing
> the VM on the source host, resumes the VM on the destination host.  Xen
> would have to track not-yet-sent pages and pause the guest on pagefault,
> and request the required page as a matter of priority.
> The advantages of this approach would be that a timing sensitive
> workloads would be paused for far less time.  Even if it was frequently
> being paused for pagefaults, the time to get a single page over the LAN
> would be far quicker than the entire dirty set, at which point on
> resume, the interrupt paths would fire again; The timing paths would
> quickly become fully populated.  Further to that, a busy workload in the
> guest dirtying a page which has already been sent will not result in any
> further network traffic.

Something like this?


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