Re: [Xen-devel] soft lockups during live migrate..

On Fri, 6 Nov 2009 10:03:44 +0000
Tim Deegan <Tim.Deegan@xxxxxxxxxx> wrote:

> > >Interesting.  Have you tried increading the amount of shadow
> > >memeory you give to the guest?  IIRC xend tries to pick a sensible
> > >default but if it's too low and you start thrashing things can get
> > >very slow indeed.
> > 
> > What do you recommend I start with for 32VCPUs and 64GB?
> 
> It really depends on the workload.  I think the default for a 64GiB
> domain will be about 128MiB, so maybe try 256MiB and 512MiB and see if
> it makes a difference.  This bit of python will let you change it on
> the fly: run it with a domid and a shadow allocation in MiB.

Setting shadow mem to 256MB fixes the problem for 64GB guest... now, it's
turn for 200GB+ guest... 


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