linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Date:	Wed, 17 Sep 2008 20:16:11 +0200
From:	Mike Galbraith <efault@....de>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-testers@...r.kernel.org
Subject: Re: [Bug #11308] tbench regression on each kernel release
	from	2.6.22 -&gt; 2.6.28

On Wed, 2008-09-17 at 16:47 +0200, Eric Dumazet wrote:

> Could you please try following patch ?
> 
> [PATCH] security_ops moved to read_mostly section
> 
> "struct security_operations *security_ops" should be moved to read_mostly 
> section in order to NOT let it share a cache line with higly modified variables.

v2.6.26-974-g2846693 (tip of revert reverts tree, == 847106f)
16384  87380  1        1       60.00    94350.45
16384  87380  1        1       60.01    95857.25
16384  87380  1        1       60.00    95334.84
16384  87380  1        1       60.00    95052.11

v2.6.26-659-g7804ad8 (first commit prior, == 2069f45)
16384  87380  1        1       60.00    98630.64
16384  87380  1        1       60.00    98653.14
16384  87380  1        1       60.00    99162.65
16384  87380  1        1       60.00    98652.38

v2.6.26-974-g2846693 patched
16384  87380  1        1       60.00    95877.41
16384  87380  1        1       60.00    95810.27
16384  87380  1        1       60.00    95530.03
16384  87380  1        1       60.00    94968.12

(poo, "it" didn't die)

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