From: ebiederm@xmission.com (Eric W. Biederman)
To: Adrian Bunk <bunk@stusta.de>
Cc: Andrew Morton <akpm@osdl.org>, Len Brown <len.brown@intel.com>,
gregkh@suse.de, Thierry Vignaud <tvignaud@mandriva.com>,
discuss@x86-64.org, Ernst Herzberg <earny@net4u.de>,
Aaron Durbin <adurbin@google.com>,
Olivier Mondoloni <olivier.mondoloni@waika9.com>,
Alex Romosan <romosan@sycorax.lbl.gov>,
ak@suse.de, linux-ide@vger.kernel.org,
oprofile-list@lists.sourceforge.net,
Jens Axboe <jens.axboe@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@linux.intel.com>,
Bryan O'Sullivan <bos@serpentine.com>,
Linus Torvalds <torvalds@osdl.org>,
linux-pm@osdl.org, Tim Chen <tim.c.chen@linux.intel.com>,
Jeff Chua <jeff.chua.linux@gmail.com>,
Paolo Ornati <ornati@fastwebnet.it>,
phil.el@wanadoo.fr, Matthew Wilcox <matthew@wil.cx>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-acpi@vger.kernel.org, mingo@redhat.com
Subject: Re: 2.6.19-rc5: known regressions
Date: Wed, 08 Nov 2006 04:18:46 -0700 [thread overview]
Message-ID: <m1y7qm425l.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <20061108085235.GT4729@stusta.de> (Adrian Bunk's message of "Wed, 8 Nov 2006 09:52:35 +0100")
Adrian Bunk <bunk@stusta.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@linux.intel.com>
> Caused-By : Eric W. Biederman <ebiederm@xmission.com>
> commit 550f2299ac8ffaba943cf211380d3a8d3fa75301
> Status : unknown
I'm not really certain who to cc on this one.
It appears the problem sequence is:
fork()
sched_setaffinity()
It got worse just because NR_IRQS doubled (and all of the associated
arrays doubled in size).
I haven't seen anyone reproduce this but Tim Chen, and Tim wasn't
able to root cause the problem so I believe we are going to have
this regression :(
Eric
next prev parent reply other threads:[~2006-11-08 11:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.64.0611071829340.3667@g5.osdl.org>
2006-11-08 8:52 ` 2.6.19-rc5: known regressions Adrian Bunk
2006-11-08 11:18 ` Eric W. Biederman [this message]
2006-11-08 15:47 ` Linus Torvalds
2006-11-09 8:04 ` Martin Lorenz
2006-11-09 13:55 ` Martin Lorenz
2006-11-10 7:53 ` Martin Lorenz
2006-11-11 1:50 ` 2.6.19-rc5: known regressions (v2) Adrian Bunk
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