Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 2 Mar 2001 18:57:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 2 Mar 2001 18:57:16 -0500 Received: from horus.its.uow.edu.au ([130.130.68.25]:5556 "EHLO horus.its.uow.edu.au") by vger.kernel.org with ESMTP id ; Fri, 2 Mar 2001 18:57:06 -0500 Message-ID: <3AA03354.A07F5179@uow.edu.au> Date: Sat, 03 Mar 2001 10:57:08 +1100 From: Andrew Morton X-Mailer: Mozilla 4.7 [en] (X11; I; Linux 2.4.2-pre2 i586) X-Accept-Language: en MIME-Version: 1.0 To: Collectively Unconscious CC: linux-kernel@vger.kernel.org Subject: Re: I/O problem with sustained writes In-Reply-To: <3AA00D5A.44FA21D0@mandrakesoft.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Collectively Unconscious wrote: > > We are having a problem with writes. > They start at 14 M/s for the first hour and then drop to 2.5 M/s and stay > that way. Reads do not seem effected and we've noticed this on the 2.2.16, > 2.2.17, 2.2.18 and now the 2.2.19pre11 kernels. > > These are SMP P-IIIs from 450 to 800 MHz. Redhat 6.2 I've seen something similar on Seagate ST313021A IDE drives. After a few minutes their read throughput falls from 20 megs/sec to about 5. Issuing *any* drive-setting command brings the throughput back. Even a command which the disk doesn't support. So I have a cron job which runs `hdparm -A1' once per minute. - - 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/