RE: [Xen-devel] Direct I/O to domU seeing a 30% performance hit

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I was asked to test direct I/O to a PV domU. Since, I had a system
with
> two NICs, I gave one to a domU and one dom0. (Each is running the same
> kernel: xen 3.0.3 x86_64.)
> 
> I'm running netperf from an outside system to the domU and dom0 and I
am
> seeing 30% less throughput for the domU vs dom0.

That doesn't make sense -- they should be identical. Is there other
stuff going on in the system that could be taking CPU time away from the
domU?

Ian

 
> Is this to be expected? If so, why? If not, does anyone have a guess
as
> to what I might be doing wrong or what the issue might be?
> 
> Thanks,
> 
> John Byrne
> 
> 
> 
> 
> 
> 
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