On Wed, 3 Aug 2011, Christoph Lameter wrote:

quoted

The netperf benchmark isn't representative of a heavy slab consuming
workload, I routinely run jobs on these machines that use 20 times the
amount of slab.  From what I saw in the earlier posting of the per-cpu
partial list patch, the min_partial value is set to half of what it was
previously as a per-node partial list.  Since these are 16-core, 4 node
systems, that would mean that after a kmem_cache_shrink() on a cache that
leaves empty slab on the partial lists that we've doubled the memory for
slub's partial lists systemwide.

Cutting down the potential number of empty slabs that we might possible
keep around because we have no partial slabs per node increases memory
usage?

You halved the number of min_partial, but there are 16 partial lists on 
these machines because they are per-cpu instead of 4 partial lists when 
they were per-node.

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