RE: [Xen-devel] Problems about CPU Affinity

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

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ian Pratt
> Sent: 18 May 2007 10:40
> To: Saori Fukuta; xen-devel
> Subject: RE: [Xen-devel] Problems about CPU Affinity
> 
> > 1. On boot
> >     We do not have the way of setting CPU Affinity to each VCPU of
> guest
> >     domain by using a configuration file.
> >     So we have to execute the commands after starting the guest
> domain.
> 
> I thought you could by specifying a list of physical CPUs? 
> Perhaps this
> got broken by the xapi changes?

No, the problem that the original post talks about, is that you can't
set affinity of individual VCPU's to individual PCPU's, e.g:
vcpus=2
cpus=2
Works well, but there's no way to perform:
vcpu0=pcpu0
vcpu1=pcpu1
Other than running "vm vcpu-set <domain> <vcpu> <pcpu(s)>" after the
domain was started. 

--
Mats
>  
> > 2. On reboot
> >     We lost the information of setting CPU Affinity that 
> set while the
> >     guest domain is running after rebooting the guest domain.
> >     So we have to set it again.
> 
> Affinity information should certainly be persistent.
> 
> Best,
> Ian
> 
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> 
> 



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