linux-kernel - Re: 2.6.19-rc4: known unfixed regressions (v3)

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Message-ID: <m1hcxdq5oz.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 05 Nov 2006 08:22:20 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ak@...e.de, discuss@...-64.org,
	Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: 2.6.19-rc4: known unfixed regressions (v3)

Adrian Bunk <bunk@...sta.de> writes:

>
> Subject    : x86_64: NR_IRQ increase causes 11.5% slowdown
>                      in lmbench's fork benchmark
> References : http://lkml.org/lkml/2006/11/2/192
> Submitter  : Tim Chen <tim.c.chen@...ux.intel.com>
> Caused-By  : Eric W. Biederman <ebiederm@...ssion.com>
>              commit 550f2299ac8ffaba943cf211380d3a8d3fa75301
> Handled-By : Eric W. Biederman <ebiederm@...ssion.com>
>              Andi Kleen <ak@...e.de>
> Status     : problem is being debugged

Currently I'm at a loss why the cross cpu fork lm_bench numbers should get
worse when you simply double NR_IRQS.  As far as I can determine nothing
on that code path is directly affected by that change.

Eric
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