Re: [PATCH] CONFIG_NR_CPUS, redux

[Martin Dalecki]

Użytkownik Ruth Ivimey-Cook napisał:
> On Tue, 11 Jun 2002, Randy.Dunlap wrote:
> 
> 
>>On 11 Jun 2002, Robert Love wrote:
>>
>>| Here are the defaults I picked:
>>|
>>| CONFIG_NR_CPUS=32: i386, mips, parisc, ppc, sparc
>>
>>I don't know what is "typical" for non-x86, but for x86, why not
>>use something more like a 'typical' NR_CPUS for SMP, like 8 (?)...
>>why still waste all of that memory?
> 
> 
> Perhaps it's just because I'm coming in late, but I cannot understand why
> NR_CPUS cannot be as low as 4 by default, for all archs, and then in the
> kernel boot messages, should more be found than is configured for a message is
> emitted to say "reconfigure your kernel", and continue with the number it was
> configured for. I personally only rarely see 2-way boxes, 4-way is pretty
> rare, and anything more must surely count as very specialized.
> 
> Let the defaults be reasonable for 99% of users (IMO 99.9%), and let the rest 
> have to think about config options...

Actually 2 would only make sense on Intel.
Well and then you have to account for the recent
HT additions so this becoumes 4.
On Sparc 4 is quite common.
But anything above is indeed very very rare.