Re: [patch] SMP alternatives

From: H. Peter Anvin
Date: Wed Nov 23 2005 - 11:52:12 EST

Gerd Knorr wrote:

Patching in/out SMP-locking with more than one active CPU would be a pretty silly idea in the first place ;)

No, doing this crap with CPU hotplug is a silly idea. Patching on a real UP system, and then throwing out the tables, makes sense. Keeping two sets of tables for a minimal performance improvement in a very rare configuration (CPU hotplug is the exception, not the rule) is just plain stupid. You probably lose as much performance from the memory hogged up in the tables as you gain from it, and on every system where you have the tables at all you take the hit.

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