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[Xen-users] DomU slower with smp?

To: xen-users@xxxxxxxxxxxxxxxxxxx
From: "Janusz Ulanowski" <janul666@xxxxxxxxx>
Date: Wed, 14 May 2008 12:35:52 +0100
Delivery-date: Wed, 14 May 2008 04:36:24 -0700
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List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi,
I just made simple peformance test with iozone tool on xen 3.2.1.

time iozone -t 20 -r 2m -s 100m -m -R

and:

Dom0 - lvm(XFS) : real 1m35.670s

DomU - 2m46.963s
lvm(xfs)
cpus = "4-7"
vcpus=4

DomU - 1m53.772s
lvm(xfs)
cpus = "8"
vcpus=1

It seems DomU is much slower if using more than one cpu.

am I right?

--
Thanks
Janul

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