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

from [Luke S. Crawford]

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To:	Marcin Owsiany <marcin@xxxxxxxxxx>
Subject:	Re: [Xen-users] Big I/O performance difference between dom0 and domU
From:	"Luke S. Crawford" <lsc@xxxxxxxxx>
Date:	Tue, 17 Apr 2007 10:57:53 -0700 (PDT)
Cc:	Liang Yang <multisyncfe991@xxxxxxxxxxx>, Xen-Users <xen-users@xxxxxxxxxxxxxxxxxxx>
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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, watchxentop in the Dom0.

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


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