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Date:	Sun, 05 Nov 2006 08:22:20 -0700
From: (Eric W. Biederman)
To:	Adrian Bunk <>
Cc:	Linus Torvalds <>, Andrew Morton <>,
	Linux Kernel Mailing List <>,,,
	Tim Chen <>
Subject: Re: 2.6.19-rc4: known unfixed regressions (v3)

Adrian Bunk <> writes:

> Subject    : x86_64: NR_IRQ increase causes 11.5% slowdown
>                      in lmbench's fork benchmark
> References :
> Submitter  : Tim Chen <>
> Caused-By  : Eric W. Biederman <>
>              commit 550f2299ac8ffaba943cf211380d3a8d3fa75301
> Handled-By : Eric W. Biederman <>
>              Andi Kleen <>
> 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.

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