From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264319AbTL3BfZ (ORCPT ); Mon, 29 Dec 2003 20:35:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264320AbTL3BfY (ORCPT ); Mon, 29 Dec 2003 20:35:24 -0500 Received: from wblv-224-192.telkomadsl.co.za ([165.165.224.192]:29889 "EHLO gateway.lan") by vger.kernel.org with ESMTP id S264319AbTL3BfR (ORCPT ); Mon, 29 Dec 2003 20:35:17 -0500 Subject: Re: 2.6.0 performance problems From: Martin Schlemmer Reply-To: azarah@nosferatu.za.org To: Dave Jones Cc: Thomas Molina , Linus Torvalds , Kernel Mailing List In-Reply-To: <20031230012715.GA30369@redhat.com> References: <1072741422.25741.67.camel@nosferatu.lan> <20031230012715.GA30369@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-flRWkNAKKHZYQIDHT+z7" Message-Id: <1072748264.25741.79.camel@nosferatu.lan> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 Date: Tue, 30 Dec 2003 03:37:44 +0200 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --=-flRWkNAKKHZYQIDHT+z7 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Tue, 2003-12-30 at 03:27, Dave Jones wrote: > On Mon, Dec 29, 2003 at 07:17:23PM -0500, Thomas Molina wrote: >=20 > > > > UDMA modes: udma0 udma1 *udma2 udma3 udma4 > > > > AdvancedPM=3Dyes: mode=3D0x80 (128) WriteCache=3Denabled > > > > Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1: > > > Any reason it is currently set to udma2 where it support udma4 ? > >=20 > > Not really. The question was what mode the disk was running in. This= is=20 > > what it defaults to. This is a laptop drive that only runs at 5400RPM= . =20 > > Would changing the mode to udma4 make a dramatic difference? =20 >=20 > It's not uncommon for a laptop to have a hard disk which supports > higher DMA modes than what the IDE chipset supports. > My aging Intel 440BX based VAIO has a disk in the same configuration > as yours, supports udma4, but chipset only goes up to udma2. >=20 Right, or as somebody else pointed out, it might not be a 80-pin cable. Lets rephrase - does it also run in udma2 mode with 2.4 ? And did you check readahead? In 2.6 it seems that a bigger value is better - I for instance have to set it to 8192 to have the same performance as in 2.4 ... --=20 Martin Schlemmer --=-flRWkNAKKHZYQIDHT+z7 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) iD8DBQA/8NboqburzKaJYLYRAkepAJ9rUypdcD03let3nZk8dCnq0ByK1gCeOx/o G6TZ5OwKzWBHkCgPNI9LGfQ= =bhw0 -----END PGP SIGNATURE----- --=-flRWkNAKKHZYQIDHT+z7--