Hello Friends, good afternoon

I'd like to ask about stored settings of dom0 and guests machine. For example, I've a SunFire x4600 with 32GB/Ram and 16 CPU's (8 CPU's dual core). When I power on my system, with the command #xm vcpu-list, I can see this

[root@srv ~]# xm vcpu-list Name ID VCPUs CPU State Time(s) CPU Affinity Domain-0 0 0 0 -b- 23.1 any cpu Domain-0 0 1 7 -b- 12.7 any cpu Domain-0 0 2 10 r-- 15.2 any cpu Domain-0 0 3 9 -b- 10.8 any cpu Domain-0 0 4 2 -b- 11.4 any cpu Domain-0 0 5 8 -b- 10.6 any cpu Domain-0 0 6 12 -b- 10.6 any cpu Domain-0 0 7 4 -b- 10.5 any cpu Domain-0 0 8 5 -b- 9.7 any cpu Domain-0 0 9 0 -b- 8.9 any cpu Domain-0 0 10 14 -b- 8.8 any cpu Domain-0 0 11 15 -b- 8.6 any cpu Domain-0 0 12 13 -b- 8.9 any cpu Domain-0 0 13 0 -b- 8.9 any cpu Domain-0 0 14 11 -b- 10.4 any cpu Domain-0 0 15 3 -b- 12.3 any cpu

Ok, but if I enter with this command (#xm vcpu-set 0 5) and restart the machine, my system return with 5 actives CPU's

PS: My /etc/xen/xend-config.sxp is configured like above (referent a CPU to dom0): (dom0-cpus 0)

So, this is my first doubt. What do you recommend like a good configuration, keep to (dom0-cpus 0) or force the max CPU to cpu0, in my case (dom0-cpus 16) ?

My second doubt is about the guest machine, when I make a config file, I can set the vcpus flag, where I can set the MAX CPU number (I believe), so, Imagine, I'd like to create a guest machine with 4 CPU's, but, maybe, I need increase this value. How do you recommend the configuration of vcpus field in guest machine config file ?!, with the max CPU possible or there are another configuration for this.

So, Thank you in advanced.

Best Regards