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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Christoph Lameter <clameter@sgi.com>
Subject: Re: 2.6.24-rc2: Network commit causes SLUB performance regression with tbench
Date: Tue, 13 Nov 2007 22:41:58 +1100
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Cc: netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
       Herbert Xu <herbert@gondor.apana.org.au>, linux-kernel@vger.kernel.org
References: <200711092336.56172.nickpiggin@yahoo.com.au> <200711101229.35822.nickpiggin@yahoo.com.au> <Pine.LNX.4.64.0711121144001.26936@schroedinger.engr.sgi.com>
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On Tuesday 13 November 2007 06:44, Christoph Lameter wrote:
> On Sat, 10 Nov 2007, Nick Piggin wrote:
> > BTW. your size-2048 kmalloc cache is order-1 in the default setup,
> > wheras kmalloc(1024) or kmalloc(4096) will be order-0 allocations. And
> > SLAB also uses order-0 for size-2048. It would be nice if SLUB did the
> > same...
>
> You can try to see the effect that order 0 would have by booting with
>
> slub_max_order=0

Yeah, that didn't help much, but in general I think it would give
more consistent and reliable behaviour from slub.