From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 14 Jan 2002 21:54:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 14 Jan 2002 21:53:50 -0500 Received: from florin.dsl.visi.com ([209.98.146.184]:64593 "HELO beaver.iucha.org") by vger.kernel.org with SMTP id ; Mon, 14 Jan 2002 21:53:46 -0500 Date: Mon, 14 Jan 2002 20:53:38 -0600 To: Rik van Riel , Alan Cox Cc: linux-kernel@vger.kernel.org Subject: 2.4.18-pre3-ac2 performance regression(?) vs. 2.4.17 Message-ID: <20020115025337.GC1226@iucha.net> Mail-Followup-To: Rik van Riel , Alan Cox , linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="32u276st3Jlj2kUU" Content-Disposition: inline User-Agent: Mutt/1.3.25i From: florin@iucha.net (Florin Iucha) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --32u276st3Jlj2kUU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Rik, Alan, I have downloaded 2.4.18-pre3-ac2 out of curiosity for the VM and IDE performance. As a "benchmark" I ran hdparm -Tt /dev/hda. The results were surprising: 2.4.17 /dev/hda: Timing buffer-cache reads: 128 MB in 0.86 seconds =3D148.84 MB/sec Timing buffered disk reads: 64 MB in 3.95 seconds =3D 16.20 MB/sec Timing buffer-cache reads: 128 MB in 0.90 seconds =3D142.22 MB/sec Timing buffered disk reads: 64 MB in 4.05 seconds =3D 15.80 MB/sec Timing buffer-cache reads: 128 MB in 0.88 seconds =3D145.45 MB/sec Timing buffered disk reads: 64 MB in 4.00 seconds =3D 16.00 MB/sec 2.4.18-pre3-ac2 /dev/hda: Timing buffer-cache reads: 128 MB in 0.99 seconds =3D129.29 MB/sec Timing buffered disk reads: 64 MB in 3.90 seconds =3D 16.41 MB/sec Timing buffer-cache reads: 128 MB in 0.93 seconds =3D137.63 MB/sec Timing buffered disk reads: 64 MB in 4.03 seconds =3D 15.88 MB/sec Timing buffer-cache reads: 128 MB in 0.92 seconds =3D139.13 MB/sec Timing buffered disk reads: 64 MB in 3.90 seconds =3D 16.41 MB/sec So while I see a slight (un)expected improvement in IDE performance, I also see a degradation in memory? performance. The box is a PIII/700MHz laptop with 256 Mb RAM. hdparm is version 4.5 Cheers, florin --=20 "If it's not broken, let's fix it till it is." 41A9 2BDE 8E11 F1C5 87A6 03EE 34B3 E075 3B90 DFE4 --32u276st3Jlj2kUU 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 iD8DBQE8Q5mxNLPgdTuQ3+QRAoNzAJ9Konb60zotaSRlPqbznMq+LNQZ3wCfdxWJ S3cBEZ6va04HfA+I6x13xXE= =SmVz -----END PGP SIGNATURE----- --32u276st3Jlj2kUU--