> for a specific type of application. I would worry about MPI-style jobs,
> where you need both low latency and high bandwidth networking, and where
Won't many people running this sort of workload be using specialised network 
hardware anyhow? A modern cluster interconnect (Infiniband, for instance) 
will likely support direct IO to user level applications - this could still 
be done under Xen.
Cheers,
Mark
> you are likely to fully utilize the TLBs as well. I cannot see how
> performance does not get hurt in this situation, when Xen needs to flush
> the TLB for every interrupt, or alternatively needs to bundle
> interrupts, thus increasing latency.
>
> Jacob
>
>
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