From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261362AbVBNIyN (ORCPT ); Mon, 14 Feb 2005 03:54:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261372AbVBNIyN (ORCPT ); Mon, 14 Feb 2005 03:54:13 -0500 Received: from postman2.arcor-online.net ([151.189.20.157]:22461 "EHLO postman.arcor.de") by vger.kernel.org with ESMTP id S261362AbVBNIxN (ORCPT ); Mon, 14 Feb 2005 03:53:13 -0500 Date: Mon, 14 Feb 2005 09:53:20 +0100 From: Tino Keitel To: linux-kernel@vger.kernel.org Cc: Droebbel Subject: Re: [Problem] slow write to dvd-ram since 2.6.7-bk8 Message-ID: <20050214085320.GA4910@dose.home.local> Mail-Followup-To: linux-kernel@vger.kernel.org, Droebbel References: <1108301794.9280.18.camel@localhost.localdomain> <20050213142635.GA2035@animx.eu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050213142635.GA2035@animx.eu.org> User-Agent: Mutt/1.5.6+20040907i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Feb 13, 2005 at 09:26:35 -0500, Wakko Warner wrote: > Droebbel wrote: > > On recent kernels, writing to DVD-RAM is much slower than to be > > expected. A 3x Writer should do about 1.9MB/s including automatic > > verify. This is what I get with 2.6.7 up to bk7. However, from 2.6.7-bk8 > > to 2.6.10 write speed is as low as 600 to 1000 kB/s. The drive's head > > jumps a lot more with these kernels. Reading is ok. > > > > I tested UDF and ext2 filesystems, > > DMA is ok according to hdparm, > > I set taskfile-io on and off when building the kernels, > > and I compared the settings for the io-scheduler. > > > > The drive is connected via onboard via82xx ide or usb2 external (both > > works perfectly with hd). > > > > The drive is a LG GSA-4163B; a GSA-4120 had the same problem as far as I > > remember. > > > > Medium: Panasonic 3x > > > > Could not find any kernel error messages. > > I have: > Host: scsi1 Channel: 00 Id: 00 Lun: 00 > Vendor: HL-DT-ST Model: DVDRAM GSA-4160B Rev: A300 > Type: CD-ROM ANSI SCSI revision: 02 > > I also notice this with 2.6.10. I think I also had it with 2.6.8.1 but I > don't remember, it's been a while. The media I use is maxell DRM47 ver 2 I also have low write performance (around 300 kb/s) with several 2.6 kernels (2.6.7 to 2.6.9-mm1) and I can hear the head jump around when I use ext2 or UDF. It will be fast when written directly to the device without a file system using dd. The drive is a LG GSA-4040B. I tried several media types from Panasonic and EMTEC. I'll try to test if the problem disappears with 2.6.6. Regards, Tino