From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265815AbUE1F5e (ORCPT ); Fri, 28 May 2004 01:57:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265817AbUE1F5e (ORCPT ); Fri, 28 May 2004 01:57:34 -0400 Received: from mx1.redhat.com ([66.187.233.31]:46303 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S265815AbUE1F5c (ORCPT ); Fri, 28 May 2004 01:57:32 -0400 Subject: Re: CONFIG_IRQBALANCE for AMD64? From: Arjan van de Ven Reply-To: arjanv@redhat.com To: Thomas Zehetbauer Cc: "'linux-kernel@vger.kernel.org'" In-Reply-To: <1085697411.29406.386.camel@forum-beta.geizhals.at> References: <1085629714.6583.12.camel@hostmaster.org> <40B578F1.3090704@pobox.com> <1085675774.6583.23.camel@hostmaster.org> <20040527170334.GE23262@krispykreme> <1085697411.29406.386.camel@forum-beta.geizhals.at> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-dtb8OWO5092fXV3W8G1H" Organization: Red Hat UK Message-Id: <1085723846.2782.6.camel@laptop.fenrus.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Fri, 28 May 2004 07:57:27 +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --=-dtb8OWO5092fXV3W8G1H Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2004-05-28 at 00:36, Thomas Zehetbauer wrote: > Unfortunately I couldn't find much info on the topic, could you please > provide some more information? Why is there a kirqd at all? For people with old distributions that didn't include irqbalanced yet ;) >=20 > What are the differences/advantages/disadvantages between the kirqd and > the user space implementation? the userspace implementation implements a more sophisticated algorithm for balancing irq's (well to be fair, since its in userspace it's easier to do this so it's not kirqd's failt that it doesn't have that).=20 While I didn't test kirqd to compare, we did see quite a difference (order of percents) in a specweb load between a naive algorithm in kirqbalanced and the current algorithm. Otoh few real life workloads get as many interrupts as specweb ;) --=-dtb8OWO5092fXV3W8G1H Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQBAttTGxULwo51rQBIRAicmAKCVEfL2iD4b4MznfBEjGzqdXlBvLQCfXy33 PrRRz88fXO1JOBMvggnQm/g= =Hrk6 -----END PGP SIGNATURE----- --=-dtb8OWO5092fXV3W8G1H--