Re: [PATCH 0/2] NR_CPUS: increase maximum NR_CPUS to 4096

[Mike Travis]

Ingo Molnar wrote:
> * Mike Travis <travis@xxxxxxx> wrote:
> 
>> Increases the limit of NR_CPUS to 4096 and introduces a boolean called 
>> "MAXSMP" which when set (e.g. "allyesconfig") will set NR_CPUS = 4096 
>> and NODES_SHIFT = 9 (512).
>>
>> I've been running this config (4k NR_CPUS, 512 Max Nodes) on an AMD 
>> box with 2 dual-cores and 4gb memory.  I've also successfully booted 
>> it in a simulated 2cpus/1Gb environment.
> 
> cool!
> 
> this depends on the cpumask changes to work correctly (i.e. to boot at 
> all), right?
> 
> 	Ingo


Yes, it overflows the stack quite quickly without the cpumask changes.
I didn't do any testing to see what's the minimal set of changes.

Thanks,
Mike
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/