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Re: [Xen-users] HVM Cpu performance 3.2

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Subject: Re: [Xen-users] HVM Cpu performance 3.2
From: "Oliver Wilcock" <oliver@xxxxxxx>
Date: Tue, 9 Dec 2008 08:23:38 -0500 (EST)
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> 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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