From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 28 Jan 2001 18:07:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 28 Jan 2001 18:07:24 -0500 Received: from smtp-server.maine.rr.com ([204.210.65.66]:11497 "HELO smtp-server.maine.rr.com") by vger.kernel.org with SMTP id ; Sun, 28 Jan 2001 18:07:13 -0500 Message-ID: <000e01c0897d$bb822600$b001a8c0@caesar> From: "paradox3" To: "Trevor Hemsley" , Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16 Date: Sun, 28 Jan 2001 17:57:47 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > It sounds to me like you have a SCSI bus problem. Have you checked > termination? Cable quality? Cable lengths? Forgive me, I'm rather ignorant of SCSI hardware.....All that I have is a cable (appears to be good quality, came with motherboard) about 60 centimeters long going from the motherboard to my hard drive. There is an unused/empty port in between. > > Do you have tagged queuing enabled for aic7xxx? It's a config option > and you can adjust the maximum queue depth. You can see the current > settings by cat /proc/scsi/aic7xxx/0 > /proc/scsi only contains a single file named "scsi" with brief info about the drive According to my last save kernel config, tagged command queueing is not enabled by default. Could this be the problem? > Do you have write caching enabled on the drive? scsiinfo -c /dev/sdx > will tell you if you do. I don't seem to have scsiinfo. > > As a data point, I copied a 650MB file to another file on the same > 10krpm disk and sync'ed in about the same time it takes you to write > 100MB. I've also copied it from a slower 7200rpm disk to my 10krpm IBM > drive and sync'ed in 1 min 19 secs which is about the read speed of > the slower disk. > > -- > Trevor Hemsley, Brighton, UK. > Trevor-Hemsley@dial.pipex.com > - 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/