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, 5 Feb 2001 13:31:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 5 Feb 2001 13:31:08 -0500 Received: from mailout03.sul.t-online.com ([194.25.134.81]:57096 "EHLO mailout03.sul.t-online.com") by vger.kernel.org with ESMTP id ; Mon, 5 Feb 2001 13:31:02 -0500 Date: Mon, 5 Feb 2001 19:32:16 +0100 From: Oliver Feiler To: linux-kernel@vger.kernel.org Subject: Very high system load writing data to SCSI DVD-RAM Message-ID: <20010205193216.A198@lionking.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i X-Operating-System: Linux 2.2.18 i686 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, I have the following problem with a DVD-RAM drive. The drive is a Panasonic LF-D101 connected to a Tekram DC395U SCSI controller. Kernel is 2.2.18 with the patch for the Tekram controller (http://www.garloff.de/kurt/linux/dc395/). When I write huge amounts of data to a DVD-RAM the system load is getting very high, like 10 or even above and the system temporarily freezes for a short time every minute or so while writing data to the drive. The DVD drive writes data with 1.35 MB/sec on the discs so there is not really much data going over the SCSI controller. Reading data from DVD-RAMs is done with 2.7 MB/s (2x) by the drive and does not cause any problems at all. This problem also existed with previous kernels (2.2.16/17) and with another SCSI controller I had before the Tekram. Adaptec 2904CD using the aic7xxx driver. There is a 4x Teac burner connected to the SCSI controller as well. Burning CDs does not raise the system load or cause any other problems. Bye, Oliver -- Oliver Feiler kiza@gmx.net http://www.lionking.org/~kiza/pgpkey PGP key ID: 0x561D4FD2 http://www.lionking.org/~kiza/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/