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RE: [Xen-users] how to pin to spefiic cpu

To: "Peter Peltonen" <peter.peltonen@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] how to pin to spefiic cpu
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Wed, 28 Feb 2007 18:37:00 +0100
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Thread-topic: [Xen-users] how to pin to spefiic cpu

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Peter Peltonen
> Sent: 28 February 2007 17:08
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] how to pin to spefiic cpu
> In Xen's 3.0 documentation is stated:
> "f you are running IO intensive tasks, its typically better to
> dedicate either a hyperthread or whole core to running domain 0, and
> hence pin other domains so that they can't use CPU 0."
> http://tx.downloads.xensource.com/downloads/docs/user/#SECTION
> 03400000000000000000
> I am mostly running web servers, so it's IO intensive.
> But I cannot find from the documentation how to actually 
> accomplish this?

If you use a line like this in the config file: 
"CPUS=[^0]" or "CPUS="[^0,1]" would give one core/hyperthread or two
cores/hyperthreads that only run Dom0. 

You may also want to configure /etc/xen/xend-cofnig.sxp to set
"(dom0-cpus 2)" so that it uses the first two CPU's in the system (or


> >From RHEL5-beta documentation I found xm commands how to accomplish
> this in running domains, but this should be set in the config file so
> we can do the pinning everytime the guest boots, right?
> Regards,
> Peter
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