From: William Lee Irwin III <wli@holomorphy.com>
To: "David S. Miller" <davem@redhat.com>
Cc: Dave Hansen <haveblue@us.ibm.com>,
Arjan van de Ven <arjanv@redhat.com>,
Badari Pulavarty <pbadari@us.ibm.com>,
lkml <linux-kernel@vger.kernel.org>,
Gerrit Huizenga <gh@us.ibm.com>,
John Stultz <johnstul@us.ibm.com>,
James Cleverdon <jamesclv@us.ibm.com>,
Andrew Morton <akpm@digeo.com>,
Keith Mannthey <mannthey@us.ibm.com>
Subject: Re: userspace irq balancer
Date: Mon, 19 May 2003 20:46:22 -0700 [thread overview]
Message-ID: <20030520034622.GK8978@holomorphy.com> (raw)
In-Reply-To: <1053401130.6830.3.camel@rth.ninka.net>
On Mon, May 19, 2003 at 08:25:31PM -0700, David S. Miller wrote:
> The in-kernel stuff MUST go. It went in because "some benchmark went
> faster", but with no "why" describing why it might have improved
> performance. We KNOW it absolutely sucks for routing and firewall
> applications. The in-kernel bits were all a shamans dance, with zero
> technical "here is why this makes things go faster" description
> attached. If I remember properly, the changelog message when the
> in-kernel irq balancing went in was of the form "this makes some
> specweb run go faster".
Absolutely. Not to mention the code for the in-kernel algorithm has
historically broken i386 ports using certain modes of Intel's
interrupt controllers.
Far better would be to validate that the affinity specified is feasible
to program into the interrupt controller in a system call and leave the
algorithm to userspace.
-- wli
next prev parent reply other threads:[~2003-05-20 3:33 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200305191314.06216.pbadari@us.ibm.com>
2003-05-19 22:07 ` userspace irq balancer Dave Hansen
2003-05-19 22:11 ` Arjan van de Ven
2003-05-19 22:22 ` Dave Hansen
2003-05-20 3:25 ` David S. Miller
2003-05-20 3:46 ` William Lee Irwin III [this message]
2003-05-20 5:03 ` Dave Hansen
2003-05-20 5:53 ` Martin J. Bligh
2003-05-20 6:13 ` David S. Miller
2003-05-20 6:36 ` Dave Hansen
2003-05-20 6:40 ` David S. Miller
2003-05-20 14:07 ` Andrew Theurer
2003-05-20 14:21 ` Jeff Garzik
2003-05-20 14:35 ` Andrew Theurer
[not found] ` <20030520.163833.104040023.davem@redhat.com>
2003-05-21 14:58 ` Martin J. Bligh
2003-05-21 22:55 ` David S. Miller
2003-05-21 11:00 ` Kai Bankett
2003-05-20 14:01 ` Martin J. Bligh
2003-05-20 9:00 ` Arjan van de Ven
2003-05-20 9:14 ` William Lee Irwin III
2003-05-20 9:17 ` Andrew Morton
[not found] ` <20030520.172230.102567463.davem@redhat.com>
2003-05-21 14:27 ` James Cleverdon
2003-05-20 15:41 Nakajima, Jun
2003-05-21 13:54 ` James Cleverdon
2003-05-21 22:56 ` Zwane Mwaikambo
-- strict thread matches above, loose matches on Subject: below --
2003-05-21 16:31 James Bottomley
2003-05-21 20:16 ` Arjan van de Ven
2003-05-21 21:43 Nakajima, Jun
2003-05-22 0:29 ` Gerrit Huizenga
2003-05-22 1:28 ` Martin J. Bligh
2003-05-22 1:44 ` Gerrit Huizenga
2003-05-22 2:03 ` William Lee Irwin III
2003-05-22 2:04 ` William Lee Irwin III
2003-05-22 2:12 ` Zwane Mwaikambo
2003-05-22 3:57 ` Martin J. Bligh
2003-05-22 17:24 ` Bill Davidsen
2003-05-22 22:44 ` David S. Miller
2003-05-26 22:24 ` Andrea Arcangeli
2003-05-26 23:26 ` Andrew Morton
2003-05-26 23:34 ` Andrea Arcangeli
2003-05-26 23:43 ` David S. Miller
[not found] ` <20030527000639.GA3767@dualathlon.random>
2003-05-27 0:15 ` David S. Miller
2003-05-27 0:41 ` Andrea Arcangeli
2003-05-27 0:48 ` David S. Miller
2003-05-27 1:09 ` Andrea Arcangeli
2003-05-27 1:13 ` David S. Miller
2003-05-27 1:26 ` Andrea Arcangeli
2003-05-27 6:11 ` David S. Miller
2003-05-27 11:53 ` Andrea Arcangeli
2003-05-27 22:04 ` David S. Miller
2003-05-27 22:27 ` Andrea Arcangeli
2003-05-27 23:55 ` David S. Miller
2003-06-13 6:22 ` David S. Miller
2003-06-13 18:23 ` Andrea Arcangeli
2003-05-27 1:16 ` Dave Jones
2003-05-27 1:17 ` David S. Miller
2003-05-27 9:07 ` Arjan van de Ven
2003-05-27 9:10 ` David S. Miller
2003-05-27 1:28 ` Andrea Arcangeli
2003-05-27 1:53 ` William Lee Irwin III
2003-05-27 1:59 ` Andrew Morton
2003-05-27 2:10 ` William Lee Irwin III
2003-05-27 2:15 ` Zwane Mwaikambo
2003-05-27 2:44 ` William Lee Irwin III
2003-05-27 2:45 ` Zwane Mwaikambo
2003-05-27 4:22 ` William Lee Irwin III
2003-05-27 2:15 ` Andrea Arcangeli
2003-05-27 2:14 ` Andrea Arcangeli
2003-05-27 2:26 ` William Lee Irwin III
2003-05-27 1:17 ` Andrea Arcangeli
2003-05-27 1:20 ` David S. Miller
2003-05-27 1:33 ` Andrea Arcangeli
2003-05-22 14:18 ` James Cleverdon
2003-05-22 14:43 ` William Lee Irwin III
2003-05-22 15:30 ` James Cleverdon
2003-05-22 15:45 ` William Lee Irwin III
2003-05-24 1:10 Nakajima, Jun
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