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Re: [Xen-devel] Xen CPU limit?

To: Martin Lukasik <martin.lukasik@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen CPU limit?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Tue, 30 Mar 2010 12:26:24 +0300
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On Tue, Mar 30, 2010 at 10:16:36AM +0100, Martin Lukasik wrote:
> Pasi Kärkkäinen wrote:
>> I think the number of virtual cpus (vcpus) per guest is (was) 32,
>> and now in Xen 4.0.0 you can have up to 64 vcpus per guest.
>> The max number of physical cpus is 128 or so..
> When I said "CPUs" I meant the number of physical CPUs (or strictly  
> speaking: cores) visible by Dom0.
> I thought I got my RPM from RedHat's repo, but there is a possibility  
> that I'm wrong here... and I thought that Xen won't support more than 32  
> cores.
> I'm not really after setting up 48 cores for one virtual machine, just  
> wanted to be able to have all 48 visible in Dom0 (and then have up to 16  
> per VM).
> Thanks for the answers; interesting read.

Why do you need to have all the cores visible to dom0? 

It's usually enough to have a couple of cores for dom0, 
and the rest free/available in Xen hypervisor for other guests.

-- Pasi

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