Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 23 Aug 2002 06:58:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 23 Aug 2002 06:58:58 -0400 Received: from fysh.org ([212.47.68.126]:1176 "EHLO bowl.fysh.org") by vger.kernel.org with ESMTP id ; Fri, 23 Aug 2002 06:58:57 -0400 Date: Fri, 23 Aug 2002 12:01:52 +0100 From: Athanasius To: Rob Speer , linux-kernel Subject: Re: 2.4.20-pre2-ac4 IDE is slow Message-ID: <20020823110152.GA8561@miggy.org.uk> Mail-Followup-To: Athanasius , Rob Speer , linux-kernel References: <20020822175945.GA743@twcny.rr.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="UlVJffcvxoiEqYs2" Content-Disposition: inline In-Reply-To: <20020822175945.GA743@twcny.rr.com> User-Agent: Mutt/1.3.28i X-gpg-fingerprint: 95DFC4A7 X-gpg-key: http://www.fysh.org/~athan/gpg-key Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2651 Lines: 81 --UlVJffcvxoiEqYs2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 22, 2002 at 01:59:45PM -0400, Rob Speer wrote: > I'm going from 2.4.19 to 2.4.20-pre2-ac4 and the hard drive is noticably > slower in the new version. (It doesn't use DMA in either version - I > wish it did in ac4, but that's a separate problem.) >=20 > What I seem to remember from the other message is that there's some > parameter that can be changed to bring the speed back up. Could someone > tell me what it is? >=20 >=20 > If it helps: output of hdparm /dev/hda >=20 > /dev/hda: > multcount =3D 0 (off) > IO_support =3D 0 (default 16-bit) This could be part of the problem too? I don't think I set anything specific to get to 32bit on my system. Hmmm, the multcount too? I'm starting to think, if this is your output from 2.4.20-pre2-ac4 that you're hitting a bug in the current code which is REALLY not doing the right thing for your controller. > unmaskirq =3D 0 (off) ^^^^^^^^^^^^^^^^^^^^^^^ Try hdparm -u1 /dev/hda > using_dma =3D 0 (off) And may as well use -d1 too if it works on the device (yes, I know you said neither kernel enabled it per default). Then you're after finding which DMA mode the IDE bus and drive can do, 'man hdparm' for the possible values (like -X69 if it's all ATA100 capable for UDMA5). With a 60GB Maxtor and an 80pin cable I use: /sbin/hdparm -u1 -d1 -X69 /dev/hda root@emelia:~# hdparm -t -T /dev/hda /dev/hda: Timing buffer-cache reads: 128 MB in 0.52 seconds =3D246.15 MB/sec Timing buffered disk reads: 64 MB in 2.03 seconds =3D 31.53 MB/sec Although I'm wondering if with ATA100 and UDMA5 I should be seeing even better than that. HTH, -Ath --=20 - Athanasius =3D Athanasius(at)miggy.org.uk / http://www.clan-lovely.org/~a= than/ Finger athan(at)fysh.org for PGP key "And it's me who is my enemy. Me who beats me up. Me who makes the monsters. Me who strips my confidence." Paula Cole - ME --UlVJffcvxoiEqYs2 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iEYEARECAAYFAj1mFiAACgkQzbc+I5XfxKc38wCdEUb/v/45lDwBXMKfd6Ts9ryM QAYAniC50tMU7Nk0QnrTr+twV/DpYpEO =zVWq -----END PGP SIGNATURE----- --UlVJffcvxoiEqYs2-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/