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Re: [Xen-devel] Report on Virtualization in Clusters

To: Rune Johan Andresen <runejoha@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Report on Virtualization in Clusters
From: Håvard Bjerke <havarbj@xxxxxxxxxxx>
Date: Fri, 26 Nov 2004 17:08:12 +0100
Cc: Jacob Gorm Hansen <jacobg@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxxx
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Please note that the application benchmarking was performed with IC enabled. 
The application benchmarking results do not reflect the problems that were 
experienced with IC disabled.


On Fri, Nov 26, 2004 at 04:27:10PM +0100, Rune Johan Andresen wrote:
> The application benchmarking behaved similar on the two clusters (with 
> different HW), which makes
> it more probably it is the overhead. As mentioned we didn't disable IC 
> on the tg3 drive so we don't
> really know.
> - Rune
> On Nov 26, 2004, at 11:44 AM, Jacob Gorm Hansen wrote:
> >Håvard Bjerke wrote:
> >>Rune and I just finished writing a report on using virtualization 
> >>with Xen in clusters, with focus on network performance. You may 
> >>download it from http://www.idi.ntnu.no/~havarbj/clust_virt.pdf
> >>We hope you find it interesting!
> >
> >Yes, very interesting. Good work.
> >
> >It seems from your tests without interrupt coalescing that Xen has a 
> >higher interrupt-handling overhead than native Linux.  I suppose that 
> >with the new IO model, Xen needs to flush the TLBs for every interrupt 
> >that arrives. Do you think this is the reason for the overhead, or are 
> >the performance problems only due to your hardware being badly 
> >supported by Xen?
> >
> >Jacob

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