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

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Date:	Mon, 3 Mar 2008 23:30:56 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Nick Piggin" <npiggin@...e.de>, 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

Hi,

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

On Mon, Mar 3, 2008 at 11:16 PM, Christoph Lameter <clameter@....com> wrote:
>  Interesting new definition....

Well, not my definition either but SLAB has guaranteed that for small
objects in the past, so I think Nick has a point here. However, with
all this back and forth, I've lost track why this matters. I suppose
it causes regression on some workload?

                                Pekka
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