Re: Re: [Xen-devel] PV kernel boot parameter maxcpus has noeffec

To:	"Jan Beulich" <jbeulich@xxxxxxxxxx>, "pasik@xxxxxx" <pasik@xxxxxx>
Subject:	Re: Re: [Xen-devel] PV kernel boot parameter maxcpus has noeffect?
From:	"Yuyang Du" <duyuyang@xxxxxxxxx>
Date:	Wed, 28 Apr 2010 18:18:01 +0800
Cc:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date:	Wed, 28 Apr 2010 03:19:16 -0700
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>However, given that the bringing up of secondary CPUs happens from common 
>(even arch-independent) code, the whole issue
>seems a little suspicious - namely what indication he uses to see that there 
>are more than 4 vCPU-s in use by Dom0.

I was not clear, and using maxcpus boot parameter in dom0 kernel is not what I 
want. 

I wanted to let xen see only one socket and schedule only that socket (4 
cores), so giving dom0 kernel boot parameter does not help. So I was wrong 
about that.

What I am looking for is to tell xen to schedule only a portion of the 
available physical processors to whatever VMs, is there any method? I checked 
the BIOS options, and there is no way to disable a processor.

Thanks,
Shawn




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Re: Re: [Xen-devel] PV kernel boot parameter maxcpus has noeffect?