From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262484AbTJGQkY (ORCPT ); Tue, 7 Oct 2003 12:40:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262491AbTJGQkY (ORCPT ); Tue, 7 Oct 2003 12:40:24 -0400 Received: from 11.ylenurme.ee ([193.40.6.11]:64472 "EHLO linking.ee") by vger.kernel.org with ESMTP id S262484AbTJGQkT (ORCPT ); Tue, 7 Oct 2003 12:40:19 -0400 Date: Tue, 7 Oct 2003 19:39:02 +0200 (EET) From: Elmer X-X-Sender: elmer@server To: Marcelo Tosatti cc: "linux-kernel@vger.kernel.org" Subject: Re: BUG: softraid,ext3 lockup In-Reply-To: Message-ID: 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 all kernels I have seen are slugish on ide-raid large raw write, However, now I got some performance test: dualprocessor server has hda,hdb ibm-hitatchi 7200 rpm IC35L060AVV207-0, 1860kb cache uniprocessor has hda,hdc(was hdb,no diff) western digital 7200 rpm WDC WD400BB-23DEA0 2000kb cache Also tested with hdparm -W 1 server | writeback |writetrough ------------|------------------------|----------- dual + ibm: |24 sec,40MB/s,load 1-2 |90 sec 11MB/s,2-4 uni + wdc: |36 sec,27MB/s,load 1-2 |160 sec 6MB/s,4-7..40 with harddisc writeback the problem does not manifest itself the problem is present when I do this directly to raw partition /dev/hda2, (while raid is running on same discs with very slim load and swap being off, 1GB mem and lots free) So there are two possible causes now: 1. ServerWorks CSB5 Chipset (rev 93) or driver plus hardiscs 2. Kernel itself, gets too high io performance and everything else is stuck. So when IO troughput gets a bit higher, the bottleneck goes away. When some other processes want a little time, they all get very stuck and load goes to hell. Elmer.