Re: [Xen-devel] PV performance degraded after live migration

[Alan.Robinson@xxxxxxxxxxxxxx (Alan Robinson)]

On Wed, Mar 15, 2017 at 09:53:02AM -0600, Jan Beulich wrote:
> >>> On 15.03.17 at 16:43, <Alan.Robinson@xxxxxxxxxxxxxx> wrote:
...
> > We have seen something similar being caused by the superpage
> > attribute getting dropped when the domU was migrated. The new
> > copy of the domU only has 4K pages instead of 2MB pages eventually
> > this would seem to fit your memory access sysbench results. 
> 
> That would be an explanation for HVM, but here we consider PV only.
> And whether a HVM guest can be re-created using large pages
> mainly depends on how fragmented the destination host memory is.
>

Yes indeed - sorry for the HVM noise..

Alan

-- 
Alan Robinson
Principal Developer, Enterprise Platform Services, Germany

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