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Re: [Xen-devel] Question about vcpu_avail

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Subject: Re: [Xen-devel] Question about vcpu_avail
From: Michal Novotny <minovotn@xxxxxxxxxx>
Date: Tue, 24 Nov 2009 16:08:16 +0100
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On 11/24/2009 04:05 PM, Keir Fraser wrote:
On 24/11/2009 14:51, "Michal Novotny"<minovotn@xxxxxxxxxx>  wrote:

We already have a config option for that, called 'vcpus'. 'vcpu_avail' can
then be used to limit the number of those which are brought online during
initial boot. Any new config-file options can be sugar on top of those.

Well, imagine scenario you need to allocate 4 vcpus to the guest but you
need to use only 2 vcpus at startup. So you suggest having `vcpus` and
`maxvcpus` options in the config file and allocating all the `maxvcpus`
and setting number of `vcpus` by setting appropriate mask using
`vcpu_avail` ?
Yeah, I think you get it. In your example: if the user specifies maxvcpus=4,
vcpus=2 then xm turns that into vcpus=4, vcpu_avail=3 before sending it to

  -- Keir

Right, so, you mean that I should implement it into `xm` command itself and not XenD ? Well, what about people using eg. libvirt with upstream Xen? This way it should not be working since XM is not used... right?

-- Michal

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