linux-kernel - Re: [rfc][patch 1/3] slub: fix small HWCACHE

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Message-ID: <20080307040540.GH21185@wotan.suse.de>
Date:	Fri, 7 Mar 2008 05:05:40 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, yanmin_zhang@...ux.intel.com,
	dada1@...mosbay.com
Subject: Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment

On Thu, Mar 06, 2008 at 07:58:06PM -0800, Christoph Lameter wrote:
> On Fri, 7 Mar 2008, Nick Piggin wrote:
> 
> > Where do I argue that it reduces cacheline contention? All arguments
> > I made apply to a UP system equally.
> 
> Huh? I thought you wanted to avoid cacheline alignment on UP to save 
> memory?

We're talking about HWCACHE_ALIGN in this thread. SMP_ALIGN is for
reducing cacheline contention and that's where you can avoid it on UP.


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