Xen devel - Apr 2006 - RE: [PATCH]Check the values of MAX_VIRT_CPUS and NR_CPUSfor SMP

>From: Keir Fraser
>Sent: 2006年4月21日 14:41
>
>
>On 21 Apr 2006, at 02:31, Atsushi SAKAI wrote:
>
>> But the logical limit of the IA64 Max CPU is larger than 64.
>> If someone change these values, some possibility make this error
>again.
>>
>> To avoid this problem, I believe this check code should be exists.
>
>See how we solve this on x86 near the top of do_boot_cpu() in
>arch/x86/smpboot.c. Essentially we allocate extra idle domains on
>demand to give us enough idle vcpus for one per physical cpu.
>
>  -- Keir
Yes, that''s the same story on ia64 where we also allocate idle 
vcpu at do_boot_cpu(). That''s why I''m not sure the real cause 
for Atsushi''s issue.

Thanks,
Kevin

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Le Vendredi 21 Avril 2006 09:11, Tian, Kevin a écrit :
> From: Keir Fraser
>
> >Sent: 2006年4月21日 14:41
> >
> >On 21 Apr 2006, at 02:31, Atsushi SAKAI wrote:
> >> But the logical limit of the IA64 Max CPU is larger than 64.
> >> If someone change these values, some possibility make this error
> >
> >again.
> >
> >> To avoid this problem, I believe this check code should be exists.
> >
> >See how we solve this on x86 near the top of do_boot_cpu() in
> >arch/x86/smpboot.c. Essentially we allocate extra idle domains on
> >demand to give us enough idle vcpus for one per physical cpu.
> >
> >  -- Keir
>
> Yes, that''s the same story on ia64 where we also allocate idle
> vcpu at do_boot_cpu(). That''s why I''m not sure the real
cause
> for Atsushi''s issue.
No, we don''t create extra domains.  Therefore it there are more CPUs
than
VCPUs, something goes wrong...

Tristan.



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