Re: [Xen-devel] Xen & I/O in clusters - Single Vs. Dual CPU issue

[Bin Ren <bin.ren@xxxxxxxxx>]

Among A1, A2, B1, B2, which ones are domain 0 and which are unpriviledged?

- Bin

On Thu, 4 Nov 2004 18:42:34 +0100, Rune Johan Andresen
<runejoha@xxxxxxxxxxx> wrote:
> Well, after the issue between two xen dom0 domains is solved there is a
> new case we don't
> understand:
> 
> With two physical domains and 4 guest OSs (2 on each physical node) we
> get some rare results with ttcp (b=1000000, l = 1000000):
> 
> Lets say we have two guest OSs on physical node A, A1 and A2, and two
> guest OSs on physical node B, B1 and B2.
> 
> Between A1 and B1 I get 110 000 KB/s (which is almost optimal!)
> Between A1 and B2 I get 81 0000 KB/s
> Between A2 and B1 I get 94 000 KB/s
> 
> Do you have any idea why we get less performance in the last two cases?
> It doesn't make sense. It cant be
> a bottleneck in the network either because of case 1.(?)
> 
> Cheers,
> Rune
> 
> 
> 
> 
> On Nov 2, 2004, at 5:51 PM, Mark A. Williamson wrote:
> 
> >> If you're using MPI over TCP/IP (which I imagine you are) then it
> >> should
> >> Just Work (TM).  We have tried live migration with MPI applications
> >> but you
> >> shouldn't have any problems moving the VMs around with a cluster.
> >
> > Sorry I meant to say we have *not* tried live migration with MPI
> > applications.
> >
> > Note to self: read before clicking send!
> >
> > Cheers,
> > Mark
> >
> >
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