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

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Date:	Wed, 14 Jul 2010 13:22:15 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
cc:	Heinz Diehl <htd@...cy-poultry.org>, Tejun Heo <tj@...nel.org>,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR

On Tue, 13 Jul 2010, Christoph Lameter wrote:

> > > Can you get us the config file. What is the value of
> > > PERCPU_DYMAMIC_EARLY_SIZE?
> >
> > My .config file is attached. I don't know how to find out what value
> > PERCPU_DYNAMIC_EARLY_SIZE is actually on, how could I do that? There's
> > no such thing in my .config.
> 
> I dont see anything in there at first glance that would cause slub to
> increase its percpu usage. This is straight upstream?
> 

The problem is that he has CONFIG_NODES_SHIFT=10 and struct kmem_cache has 
an array of struct kmem_cache_node pointers with MAX_NUMNODES entries 
which blows its size up to over 8K.  That's probably overkill for his 
quad-core 8GB AMD, so I'd recommend lowering CONFIG_NODES_SHIFT to 6.
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