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

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Message-Id: <1162492453.10806.75.camel@localhost.localdomain>
Date:	Thu, 02 Nov 2006 10:34:13 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.19-rc1: Slowdown in lmbench's fork

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.
Adding the percpu vector_irq variable did not cause any changes.  

Tim
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