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[Xen-devel] CPU usage for credit2

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] CPU usage for credit2
From: Yuehai Xu <yuehaixu@xxxxxxxxx>
Date: Thu, 23 Sep 2010 09:48:10 -0400
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, xen-tools@xxxxxxxxxxxxxxxxxxx, yhxu@xxxxxxxxx
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Hi,

Suppose 2 VMs both of which just has a single VCPU share a single
PCPU, if I run CPU intensive program in both of the VMs, the
percentage of CPU usage from xentop is almost 100% for both of the
VMs. I got confusing because since 2 VCPU shares a single PCPU, the
percentage for each one should be around 50%, which is the result if I
change the scheduler from credit2 to credit.

Does it because credit2 change something or is this a bug for xentop or credit2?

Thanks,
Yuehai

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