On Wed, 14 Nov 2007, David Miller wrote:

quoted text
> > As a result, we may allocate more than a page of data in the
> > non-TSO case when exactly one page is desired.

Well this is likely the result of the SLUB regression. If you allocate an 
order 1 page then the zone locks need to be taken. SLAB queues the a 
couple of higher order pages and can so serve a couple of requests without 
going into the page allocator whereas SLUB has to go directly to the page 
allocator for allocate and free. I guess that needs fixing in the page 
allocator. Or do I need to add a mechanism to buffer higher order page 
allcoations to SLUB?


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