[PATCH] slab: avoid higher-order allocations

[PATCH] slab: avoid higher-order allocations

From: Manfred Spraul <manfred@colorfullife.com>

At present slab is using 2-order allocations for the size-2048 cache.  Of
course, this can affect networking quite seriously.

The patch ensures that slab will never use more than a 1-order allocation
for objects which have a size of less than 2*PAGE_SIZE.