Re: [Xen-ia64-devel] dom0-smp issue.

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Vendredi 28 Juillet 2006 04:55, yo.fujita a écrit :
> Hi Tristan, Isaku,
>
> Thanks for your reply and sorry for my ignorance...
> I tried recompile with CONFIG_NR_CPUS=8.
> As it turned out, I can boot up with 4 CPUs when specifying
> dom0_max_vcpus=4.
> [root@tiger70 ~]# xm vcpu-l
> Name                              ID  VCPU  CPU  State  Time(s)  CPU
> Affinity
> Domain-0                           0     0    0   r--     193.1  0
> Domain-0                           0     1    1   r--     192.8  any cpu
> Domain-0                           0     2    2   r--     192.6  any cpu
> Domain-0                           0     3    3   r--     192.3  any cpu
>
> But, I could see only 6 CPUs when I specified dom0_max_vcpus=8. (see
> attachment)
> The #3 CPU's socket of this machine is empty.
> I think the empty CPU's socket is not recognized.
> Is this correct work?
Wether or not is this correct is a question.
The fact is that the first 8 MADT entries correspond to 6 enabled cpus and 2 
disabled cpus.  Linux consider the 2 disabled cpus as cpus.
I suppose you could start these 2 additionnal cpus using the vcpu hotplug 
feature:
echo 1 > /sys/devices/system/cpu/cpuN/online

Tristan.

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