Messages in this thread | | | Date | Thu, 13 Jun 2002 10:51:19 +0200 | From | Helge Hafting <> | Subject | Re: [PATCH] CONFIG_NR_CPUS, redux |
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Ruth Ivimey-Cook wrote:
> 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. > Why not let the boot process select the highest of two numbers, the (default-low) NR_CPUS and the number of CPU's detected?
Boot with "too many" cpu's and you still get to use them - you merely can't hotplug even more.
Configuring a high NR_CPUS becomes something only hot-pluggers need to do, or those whose architecture doesn't support cpu detection in the early boot process. Those with a fixed number of detectable CPUs can simply go with a default of NR_CPUS=2 no matter what they actually have.
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