Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

Eric W. Biederman
2006-08-07T15:56:29Z

Andi Kleen <ak@suse.de> writes:

> On Monday 07 August 2006 17:26, Eric W. Biederman wrote:
>>
>> Currrently on a SMP system we can theoretically support
>> NR_CPUS*224 irqs. Unfortunately our data structures
>> don't cope will with that many irqs, nor does hardware
>> typically provide that many irq sources.
>>
>> With the number of cores starting to follow Moores
>> law, and the apicid limits being raised beyond an 8bit
>> number trying to track our current maximum with our
>> current data structures would be fatal and wasteful.
>>
>> So this patch decouples the number of irqs we support
>> from the number of cpus. We can revisit this decision
>> once someone reworks the current data structures.
>
> Ok. I was about to apply it, but it seems to require
> mm patches right now, so i didn't

Right. This is post 2.6.18 material, that is getting
the final bug fixes now. So it will be ready when 2.6.19 opens
up. Andi I just wanted to make certain you saw it. :)

Eric