netdev - Re: hackbench regression due to commit 9dfc6e68bfe6e

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Message-ID: <1270702774.8141.49.camel@edumazet-laptop>
Date:	Thu, 08 Apr 2010 06:59:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.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

Le jeudi 08 avril 2010 à 09:05 +0800, Zhang, Yanmin a écrit :

> > 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/

Yes, this is what advertizes my L1 cache having 64bytes lines, but I
would like to check that in practice, this is not 128bytes...

./index0/type:Data
./index0/level:1
./index0/coherency_line_size:64
./index0/physical_line_partition:1
./index0/ways_of_associativity:8
./index0/number_of_sets:64
./index0/size:32K
./index0/shared_cpu_map:00000101
./index0/shared_cpu_list:0,8
./index1/type:Instruction
./index1/level:1
./index1/coherency_line_size:64
./index1/physical_line_partition:1
./index1/ways_of_associativity:4
./index1/number_of_sets:128
./index1/size:32K
./index1/shared_cpu_map:00000101
./index1/shared_cpu_list:0,8


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