linux-kernel - Re: hackbench regression due to commit 9dfc6e68bfe6e

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Message-Id: <1270688747.2078.383.camel@ymzhang.sh.intel.com>
Date:	Thu, 08 Apr 2010 09:05:47 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	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

On Wed, 2010-04-07 at 20:38 +0200, Eric Dumazet wrote:
> 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 ?
If there is no, it's easy to write it as kernel exports the cache stat by
/sys/devices/system/cpu/cpuXXX/cache/indexXXX/

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


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