linux-kernel - Re: 2.6.19-rc1: x86_64 slowdown in lmbench's fork

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Date:	Fri, 3 Nov 2006 03:11:45 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, ak@...e.de, discuss@...-64.org
Subject: Re: 2.6.19-rc1: x86_64 slowdown in lmbench's fork

On Thu, Nov 02, 2006 at 10:34:13AM -0800, Tim Chen wrote:
> On Thu, 2006-11-02 at 11:33 -0700, Eric W. Biederman wrote:
> 
> > My only partial guess is that it might be worth adding the per cpu
> > variables my patch adds without any of the corresponding code changes.
> > And see if adding variables to the per cpu area is what is causing the
> > change.
> > 
> > The two tests I can see in this line are:
> > - to add the percpu vector_irq variable.
> > - to increase NR_IRQs.
> 
> Increasing the NR_IRQs resulted in the regression.
>...

What's your CONFIG_NR_CPUS setting that you are seeing such a big
regression?

> Tim

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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