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RE: [Xen-users] HVM Cpu performance 3.2

  • To: "Oliver Wilcock" <oliver@xxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
  • Date: Tue, 9 Dec 2008 13:31:27 -0000
  • Cc:
  • Delivery-date: Tue, 09 Dec 2008 05:32:50 -0800
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AclaAXO//F0JpyMKTT6LHcInA9bpHwAAM0gg
  • Thread-topic: [Xen-users] HVM Cpu performance 3.2

Yes thats correct.

The windows dom Us are using between 30-80% usage in xm top and the host
itself is running slow.

Ill have a look at your recommend searches

Thanks for your help


-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Oliver
Sent: 09 December 2008 13:24
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] HVM Cpu performance 3.2

> Date: Tue, 9 Dec 2008 12:15:13 -0000
> From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
> Subject: [Xen-users] HVM Cpu performance 3.2
> Hi,
> It seems after upgrading to this release the cpu consumption has
> increased quite considerably.
> The server is an AMD 2.6 Dual Core.
> If you set the HVM config to use 1 vcpu instead of 2 the performance
> increases a lot which is quite strange.
> Anyone else had this problem? It was working fine on 3.0.4
> Thanks
> Ian

Do you mean that a Windows HVM consumes a lot of CPU according to xm
If so you may have my problem - search for ACPI APIC and Windows HAL
issues in relation to performance of Windows HVM.

I haven't use Xen earlier than 3.2 (SLES10 sp2) so I can't comment on an
increase or comparison to Xen 3.0.2.

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