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

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

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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