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

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Message-ID: <1270741939.2215.68.camel@edumazet-laptop>
Date:	Thu, 08 Apr 2010 17:52:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	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 10:34 -0500, Christoph Lameter a écrit :
> On Thu, 8 Apr 2010, Eric Dumazet wrote:
> 
> > I suspect NUMA is completely out of order on current kernel, or my
> > Nehalem machine NUMA support is a joke
> >
> > # numactl --hardware
> > available: 2 nodes (0-1)
> > node 0 size: 3071 MB
> > node 0 free: 2637 MB
> > node 1 size: 3062 MB
> > node 1 free: 2909 MB
> 
> How do the cpus map to the nodes? cpu 0 and 1 both on the same node?

one socket maps to 0 2 4 6 8 10 12 14 (Node 0)
one socket maps to 1 3 5 7 9 11 13 15 (Node 1)

# numactl --cpubind=0 --membind=0 numactl --show
policy: bind
preferred node: 0
interleavemask: 
interleavenode: 0
nodebind: 0 
membind: 0 
cpubind: 1 3 5 7 9 11 13 15 1024 

(strange 1024 report...)

# numactl --cpubind=1 --membind=1 numactl --show
policy: bind
preferred node: 1
interleavemask: 
interleavenode: 0
nodebind: 
membind: 1 
cpubind: 0 2 4 6 8 10 12 14 



[    0.161170] Booting Node   0, Processors  #1
[    0.248995] CPU 1 MCA banks CMCI:2 CMCI:3 CMCI:5 CMCI:6 SHD:8
[    0.269177]  Ok.
[    0.269453] Booting Node   1, Processors  #2
[    0.356965] CPU 2 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8
[    0.377207]  Ok.
[    0.377485] Booting Node   0, Processors  #3
[    0.464935] CPU 3 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8
[    0.485065]  Ok.
[    0.485217] Booting Node   1, Processors  #4
[    0.572906] CPU 4 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8
[    0.593044]  Ok.
...
grep "physical id" /proc/cpuinfo 
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0
physical id	: 1
physical id	: 0


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