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

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Message-ID: <20080305000637.GA1510@wotan.suse.de>
Date:	Wed, 5 Mar 2008 01:06:37 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	yanmin_zhang@...ux.intel.com, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment

On Mon, Mar 03, 2008 at 01:16:44PM -0800, Christoph Lameter wrote:
> On Mon, 3 Mar 2008, Nick Piggin wrote:
> 
> > > HWCACHE_ALIGN means that you want the object to be aligned at 
> > > cacheline boundaries for optimization. Why does crossing cacheline 
> > > boundaries matter in this case?
> > 
> > No, HWCACHE_ALIGN means that you want the object not to cross cacheline
> > boundaries for at least cache_line_size() bytes. You invented new
> 
> Interesting new definition....

Huh?? It is not a new definition, it is exactly what SLAB does. And
then you go and do something different and claim that you follow
what slab does.

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