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

To: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen & I/O in clusters - Single Vs. Dual CPU issue
From: Håvard Bjerke <Havard.Bjerke@xxxxxxxxxxx>
Date: Tue, 2 Nov 2004 17:13:08 +0100
Cc: =?unknown-8bit?q?H=E5vard?= Bjerke <Havard.Bjerke@xxxxxxxxxxx>, Rune Johan Andresen <Rune.Johan.Andresen@xxxxxxxxxxx>, Xen Virtual Machine Monitor <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
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On Fri, Oct 29, 2004 at 08:46:46PM +0100, Ian Pratt wrote:
> > The native systems can have either XT-PIC or IOAPIC, and it seems that both 
> > have equal performance. In Xen0, however, by looking through dmesg, there 
> > doesn't seem to be any IOAPIC. Is it possible to enable (or disable) IOAPIC 
> > in Xen0?
> If you boot with 'ignorebiostables' on the Xen command line Xen
> will ignore the IOAPIC and use the PIC.
> I could believe there might be a lurking performance problem with
> PIC support as it probably hasn't had the same level of
> performance testing as IOAPIC.

'ignorebiostables' did the trick. Thanks for the help :) 

Now I'm curious about live migration. Is it possible to live migrate an MPI 
application running on a set of nodes to another set of nodes? Has anyone tried 


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