On Fri, 7 Dec 2007, Linus Torvalds wrote:

quoted text
> The biggest cost of __slab_alloc() in my profile is the "slab_lock()", but 
> that may not be the one that causes problems in a 64-cpu setup, so it 
> would be good to have that verified.

Hmmmm.. This would indicate lock contention on a slab.

quoted text
> [ The whole node match thing is likely totally bogus. I suspect we pay 
>   *more* in trying to match nodes than we'd ever likely pay in just 
>   returning the wrong node for an allocation, but that's neither here nor 
>   there ]

Node match is necessary in order to make the allocator able to get memory 
for the node that the caller requested.
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