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

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Message-ID: <47CC6F30.50802@cs.helsinki.fi>
Date:	Mon, 03 Mar 2008 23:35:44 +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,

Christoph Lameter wrote:
> Well the guarantee can only be exploited if you would check the cacheline 
> sizes and the object size from the code that creates the slab cache. 
> Basically you would have to guestimate what the slab allocator is doing.
> 
> So the guarantee is basically meaningless. If the object is larger than a 
> cacheline then this will never work.

Yes, I know that. That's why I am asking why this matters. If there's 
some sort of regression because SLUB does HWCACHE_ALIGN bit differently, 
we need to fix that. Not that it necessarily means we have to change 
HWCACHE_ALIGN but I am assuming Nick has some reason why he wants to 
introduce the SMP alignment flag.

			Pekka
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