RE: [Xen-users] VCPU number configuration

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: Songtao Liu [mailto:songtao.liu@xxxxxxxx] 
> Sent: 02 July 2007 17:10
> To: Petersson, Mats
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] VCPU number configuration
> 
> 
> Original Message:
> 
>  
> <br />
> <br />> -----Original Message-----
> <br />> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> <br />> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> <br />> Songtao Liu
> <br />> Sent: 02 July 2007 15:51
> <br />> To: xen-users@xxxxxxxxxxxxxxxxxxx
> <br />> Subject: [Xen-users] VCPU number configuration
> <br />> 
> <br />> Hi
> <br />> 
> <br />> as when I installed the XenU I initialized the VCPU=1, is it 
> <br />> possible to change VCPU=2
> <br />
> <br />No, not without restarting the guest from scratch. 
> Whilst it's possible
> <br />to REDUCE the processor count, you can't increase it 
> after it's been
> <br />started [actually, the technicality of it is that 
> there's a MAX_CPU
> <br />count in the domain config parameters, which is hidden 
> from the config
> <br />files at present, but that is the number of VCPU's 
> "reserved" when the
> <br />domain is set up, and with a normal config file, you 
> get MAX_VCPUS=VCPUS
> <br />at the domain creation]. 
> <br />
> <br />--
> <br />Mats
> <br />
> <br />
> <br />
> So if I want to get a guest with 2 VCPUs, I must install a 
> new one? no other ways?

No, you need to change the configuration file for the original guest to
say VCPUS=2 instead of VCPUS=1. Then you could, if you wanted to, use
the "xm vcpu-set" to reduce it back down to 1, but you can't set it
higher than 2. 

--
Mats
> 
> Songtao
> 



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