Re: Free memory never fully used, swapping

[Christoph Lameter]

On Thu, 25 Nov 2010, KOSAKI Motohiro wrote:
> Please try SLAB instead SLUB (it can be switched by kernel build option).
> SLUB try to use high order allocation implicitly.

SLAB uses orders 0-1. Order is fixed per slab cache and determined based
on object size at slab creation.

SLUB uses orders 0-3. Falls back to smallest order if alloc order cannot
be met by the page allocator.

One can reduce SLUB to SLAB orders by specifying the following kernel
commandline parameter:

slub_max_order=1
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