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

[Rune Johan Andresen <runejoha@xxxxxxxxxxx>]

A and B are domain 0, A1,A2,B1,B2 are the guest OS systems. I think all 
are privileged (?), They are
created with the same config file, exception of the file loopback 
configuration and ip config.
Cheers,
Rune

On Nov 4, 2004, at 7:41 PM, Bin Ren wrote:

> 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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