From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262603AbTLLW6l (ORCPT ); Fri, 12 Dec 2003 17:58:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262652AbTLLW6k (ORCPT ); Fri, 12 Dec 2003 17:58:40 -0500 Received: from smtp1.USherbrooke.ca ([132.210.244.17]:30414 "EHLO courrier3.usherbrooke.ca") by vger.kernel.org with ESMTP id S262603AbTLLW5u (ORCPT ); Fri, 12 Dec 2003 17:57:50 -0500 Subject: Re: Increasing HZ (patch for HZ > 1000) From: Jean-Marc Valin To: Pavel Machek Cc: "Martin J. Bligh" , Linux Kernel In-Reply-To: <20031212220853.GA314@elf.ucw.cz> References: <1071126929.5149.24.camel@idefix.homelinux.org> <1293500000.1071127099@[10.10.2.4]> <20031212220853.GA314@elf.ucw.cz> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-WKeHwuEcONFhd/CXOjNx" Organization: Universite de Sherbrooke Message-Id: <1071269849.4182.14.camel@idefix.homelinux.org> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Fri, 12 Dec 2003 17:57:29 -0500 X-UdeS-MailScanner-Information: Veuillez consulter le http://www.usherbrooke.ca/vers/virus-courriel X-UdeS-MailScanner: Aucun code suspect =?ISO-8859-1?Q?d=E9tect=E9?= X-MailScanner-SpamCheck: n'est pas un polluriel, SpamAssassin (score=-4.9, requis 5, BAYES_00 -4.90) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --=-WKeHwuEcONFhd/CXOjNx Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable > Every notebook from thinkpad 560X up has produced some kind of > cpu-load-related-noise. You'd have to throw out quite a lot of > notebooks... You're right, I'm probably not the only one. It may be worth at least having an option to change HZ to less annoying values. Otherwise there are going to be lots of complaints when people try out 2.6 on their laptops and hear that noise. On mine, I seriously could not stand the noise more than 5 minutes. Not because it was that loud but 1 kHz is really annoying. > PS: Jean, can you try how high you can get it? You might want to go to > 24kHz so that no human can hear it, or to 100kHz to be kind to > cats. At ~1MHz you'd be even kind to bats :-), but it is probably > impossible to get over 200kHz or so. Still it might be funny > experiment. For now, my patch only allows up to around 10 kHz. At that frequency, I don't hear anything because the noise is not loud enough (ear is much more sensitive at 1 kHz). Also, I have around 10% overhead on my Pentium-M 1.6 GHz, so I guess it's not for everyone. Extrapolating from there, I'd also say that at 100 kHz, it wouldn't do anything but handle the interrupts, which is slightly annoying when you want to actually get some work done :) Jean-Marc --=20 Jean-Marc Valin, M.Sc.A., ing. jr. LABORIUS (http://www.gel.usherb.ca/laborius) Universit=E9 de Sherbrooke, Qu=E9bec, Canada --=-WKeHwuEcONFhd/CXOjNx Content-Type: application/pgp-signature; name=signature.asc Content-Description: Ceci est une partie de message =?ISO-8859-1?Q?num=E9riquement?= =?ISO-8859-1?Q?_sign=E9e=2E?= -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQA/2kfZdXwABdFiRMQRAt0WAJwJL7cv/f51N3oEOS8D9R63Ggaz7wCeLu9B 9/7ZtYolmAj8eVzX98+shXE= =WEIh -----END PGP SIGNATURE----- --=-WKeHwuEcONFhd/CXOjNx--