linux-kernel - Re: 2.6.19-rc5: known regressions

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Date:	Mon, 13 Nov 2006 17:03:14 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	tim.c.chen@...ux.intel.com
Cc:	Adrian Bunk <bunk@...sta.de>, Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.19-rc5: known regressions

Tim Chen <tim.c.chen@...ux.intel.com> writes:

> On Wed, 2006-11-08 at 22:10 -0700, Eric W. Biederman wrote:
>
>> 
>> Cool.  I'm glad to know it was simply a buggy lmbench.
>> 
>> What is sysconf(_SN_NPROCESSORS_ONLN) doing that it slows down as the
>> number of irqs increase?  It is a slow path certainly but possibly
>> something we should fix.  My hunch is cat /proc/cpuinfo...
>> 
>
> The increase in time of sysconf(_SN_NPROCESSORS_ONLN) call
> is within "show_stat" function after looking at profiling data.  
> There are a couple of loops that iterate over kstat_irqs 
> interrupt statistics and depend on NR_IRQS.  Doesn't 
> look like something we need to fix.

Thanks.

Eric

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