From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264315AbTL3Btj (ORCPT ); Mon, 29 Dec 2003 20:49:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264320AbTL3Btj (ORCPT ); Mon, 29 Dec 2003 20:49:39 -0500 Received: from [24.35.117.106] ([24.35.117.106]:10123 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S264315AbTL3Bti (ORCPT ); Mon, 29 Dec 2003 20:49:38 -0500 Date: Mon, 29 Dec 2003 20:49:07 -0500 (EST) From: Thomas Molina X-X-Sender: tmolina@localhost.localdomain To: Martin Schlemmer cc: Dave Jones , Linus Torvalds , Kernel Mailing List Subject: Re: 2.6.0 performance problems In-Reply-To: <1072748264.25741.79.camel@nosferatu.lan> Message-ID: References: <1072741422.25741.67.camel@nosferatu.lan> <20031230012715.GA30369@redhat.com> <1072748264.25741.79.camel@nosferatu.lan> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 30 Dec 2003, Martin Schlemmer wrote: > > 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. > > > > 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 ... 8192 will be my next test. I'm doing a compile at the moment. It runs in udma2 under both 2.4 and 2.6. If I need an 80-pin cable then udma4 is not possible for this system. If I read the following, it is only capable of 66MHz anyway: 00:07.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 10) (prog-if 8a [Master SecP PriP]) Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR-