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[Xen-devel] Question about machine time delay in guest domains (Full virtualization)

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: "christie kumiko goto" <christie0123@xxxxxxxxx>
  • Date: Tue, 8 Jan 2008 23:03:18 +0900
  • Delivery-date: Tue, 08 Jan 2008 06:03:56 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Hello, everyone,

I'm struggling with machine time delay in guest domains
(full virtualization).

In order to evaluate cpu performance in full virtualization, I applied
"SPEC CPU2006" and found that 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 there is some relationship between the number of
domains and cores.
(please see the following results)

Does anyone experience a similar problem (time delay 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 great kindness.
I wish you all the best for 2008.

Many thanks,

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