netdev - Re: hackbench regression due to commit 9dfc6e68bfe6e

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Message-ID: <1270665484.8141.47.camel@edumazet-laptop>
Date:	Wed, 07 Apr 2010 20:38:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	netdev <netdev@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	alex.shi@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ma, Ling" <ling.ma@...el.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e

Le mercredi 07 avril 2010 à 13:20 -0500, Christoph Lameter a écrit :
> On Wed, 7 Apr 2010, Pekka Enberg wrote:
> 
> > Oh, sorry, I think it's actually '____cacheline_aligned_in_smp' (with four
> > underscores) for per-cpu data. Confusing...
> 
> This does not particulary help to clarify the situation since we are
> dealing with data that can either be allocated via the percpu allocator or
> be statically present (kmalloc bootstrap situation).
> 
> --

Do we have a user program to check actual L1 cache size of a machine ?

I remember my HP blades have many BIOS options, I would like to make
sure they are properly set.



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