linux-kernel - Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP

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Date:	Mon, 12 Jul 2010 10:11:50 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Heinz Diehl <htd@...cy-poultry.org>
cc:	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>,
	David Rientjes <rientjes@...gle.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR

On Sat, 10 Jul 2010, Heinz Diehl wrote:

> On 10.07.2010, Christoph Lameter wrote:
>
> > The following patchset cleans some pieces up and then equips SLUB with
> > per cpu queues that work similar to SLABs queues. With that approach
> > SLUB wins significantly in hackbench and improves also on tcp_rr.
>
> The patchset applies cleanly, however compilation fails with
>
> [....]
> mm/slub.c: In function ‘alloc_kmem_cache_cpus’:
> mm/slub.c:2093: error: negative width in bit-field ‘<anonymous>’
> make[1]: *** [mm/slub.o] Error 1
> make: *** [mm] Error 2
> make: *** Waiting for unfinished jobs....
> [....]

You need a sufficient PERCPU_DYNAMIC_EARLY_SIZE to be configured. What
platform is this? Tejon: You suggested the BUILD_BUG_ON(). How can he
increase the early size?