I would recommend to have a look at chapter "4.2.2 Domain Scheduling
Management Commands" of the Xen user manual
(http://www.cl.cam.ac.uk/research/srg/netos/xen/readmes/user/user.html).
If you use the standard Xen scheduler, you can limit the maximum amount
of CPU a guest is allowed to use with the "xm sched-credit -d <domain>
-c <cap>" command. So you could restrict a domain to only use 25%/75% of
the CPU. You can as well use other Xen schedulers to eventually optimize
CPU utilization.
________________________________
 From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Marco
Strullato
 Sent: 20 September 2007 07:43
 To: xen-users@xxxxxxxxxxxxxxxxxxx
 Subject: [Xen-users] shared cpu resources
 
 
 Hi all!
 I have a doubt about shared resources:
 
 If I have a Dom-0 and two virtual machines Dom1 and Dom2, how
can I split cpu resources? I mean how can I assign exactly 25% of cpu to
Dom1 and 75% of cpu to Dom1? (I assume that Dom-0 uses 0% of cpu). 
 
 Can I also choose which is the virtual machine I assign the disk
I/O speed?
 
 Thanks very much!
 
 Marco
 
 
 
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