Re: [Xen-users] Big I/O performance difference between dom0 and domU

["Luke S. Crawford" <lsc@xxxxxxxxx>]

On Tue, 17 Apr 2007, Marcin Owsiany wrote:
> On Tue, Apr 17, 2007 at 09:34:10AM -0700, Liang Yang wrote:
> > What is the CPU utilization when you did this I/O performance measurement?
> "% CPU" reported by bonnie when writing/reading/random seeking in is
> 6/3/0% in dom0 and 4/2/0% in domU. bonnie was the only thing running
> when performing the test.
watch top in the Dom0 while running bonnie in the DomU;   better, watch 
xentop in the Dom0.

when you do I/O in the DomU, it needs to go through the Dom0 in order to 
get to the real disk.
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