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

[John Byrne <jbyrne@xxxxxxxxxxxxxxxxxxxxxx>]

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.
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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