[Xen-users] More vcpus than physical cores and hvm

To:	xen-users@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-users] More vcpus than physical cores and hvm
From:	"Alexandre Biancalana" <biancalana@xxxxxxxxx>
Date:	Wed, 24 Sep 2008 18:32:32 -0300
Delivery-date:	Wed, 24 Sep 2008 14:33:21 -0700
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Hi List,

  I have a server with two QuadCore 2.93Ghz processors and 16GB Ram,
running Debian etch and Xen 3.2-1.

  Until yesterday I had in this server 2 hvm virtual machines, running
w2k, 4 vcpus each without any problem, the use of each virtual machine
rarely reach 70%. Today I cloned one of the virtual machines and
started they with 2 vcpus, right after I start this new guest the use
of cpus on the others guest vms showed by task manager climb to 50%
(kernel time)  and If I start another new guest with 2 vcpus, the
first two guests reach close to 100% of cpu use

  Can I have more vcpus than physical cores on Xen ?? There's
something to do with hvm ? Have some configuration (cpu scheduling) to
improve this situation ? Someone have a similar setup ?

 Best Regards,

Alexandre

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[Xen-users] More vcpus than physical cores and hvm