Re: [Q] Default SLAB allocator

From: Eric Dumazet
Date: Tue Oct 16 2012 - 08:55:56 EST

On Tue, 2012-10-16 at 09:35 -0300, Ezequiel Garcia wrote:

> Now, returning to the fragmentation. The problem with SLAB is that
> its smaller cache available for kmalloced objects is 32 bytes;
> while SLUB allows 8, 16, 24 ...
> Perhaps adding smaller caches to SLAB might make sense?
> Is there any strong reason for NOT doing this?

I would remove small kmalloc-XX caches, as sharing a cache line
is sometime dangerous for performance, because of false sharing.

They make sense only for very small hosts.

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