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Re: [Xen-users] HVM Cpu performance 3.2

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Oliver Wilcock" <oliver@xxxxxxx>
  • Date: Tue, 9 Dec 2008 08:23:38 -0500 (EST)
  • Delivery-date: Tue, 09 Dec 2008 05:24:27 -0800
  • Importance: Normal
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

> 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 top? 
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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