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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Christoph Lameter <clameter@sgi.com>
Subject: Re: tbench regression - Why process scheduler has impact on tbench and why small per-cpu slab (SLUB) cache creates the scenario?
Date: Tue, 11 Sep 2007 14:59:09 +1000
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Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, mingo@elte.hu,
       Mel Gorman <mel@skynet.ie>,
       Linus Torvalds <torvalds@linux-foundation.org>
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On Wednesday 12 September 2007 06:19, Christoph Lameter wrote:
> On Tue, 11 Sep 2007, Nick Piggin wrote:
> > The impression I got at vm meeting was that SLUB was good to go :(
>
> Its not? I have had Intel test this thoroughly and they assured me that it
> is up to SLAB. This particular case is an synthetic tests for a PAGE_SIZE
> alloc and SLUB was not optimized for that case because PAGE_SIZEd
> allocations should be handled by the page allocators. Quicklists were
> introduced for the explicit purpose to get these messy page sized cases
> out of the slab allocators.

I heard from one person at KS and one person here that it is not. If they're
simply missing some patch that's in -mm, and there is no longer a SLUB vs
SLAB regression when using equivalent page allocation order, then that's
fine.
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