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[Xen-users] Machine time delay in guest domains (Full virtualization)

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Machine time delay in guest domains (Full virtualization)
From: "KUMIKO GOTO" <gotou.kumiko@xxxxxxxxx>
Date: Fri, 28 Dec 2007 00:49:18 +0900
Delivery-date: Thu, 27 Dec 2007 07:50:16 -0800
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I have one question about machine time delay in guest domains (full

In order to evaluate cpu performance, I applied "SPEC CPU2006" and found
machine time of guest domains is severely delayed from actual time.
->Actual test time : test time measured in guest domains = 4:1
(e.g., Actual test time =40 min, test time measured in guest domain time
=10 min)

I think that there is some relationship between the number of domains and
(please see the following results)

Does anyone know why this kind of time delay occurs in Xen?

-Host machine has 2 cores (core number 0-1)
-Guest OSs: Full virtualization

*test 1
4 domains share 2 core (each domain has 2 vcpu)
->result: actual test time : test time measured in guest domains = 4:1

*test 2
2 domains share 1 core and the other 2 domains share the other 1 core.
->result: actual test time : test time measured in guest domains = 2:1

Thanks for your kindness.


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