From owner-freebsd-scsi Fri Sep 10 13:48:52 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from caspian.plutotech.com (caspian.plutotech.com [206.168.67.80]) by hub.freebsd.org (Postfix) with ESMTP id 082BA1602D; Fri, 10 Sep 1999 13:48:47 -0700 (PDT) (envelope-from gibbs@caspian.plutotech.com) Received: from caspian.plutotech.com (localhost [127.0.0.1]) by caspian.plutotech.com (8.9.3/8.9.1) with ESMTP id OAA03111; Fri, 10 Sep 1999 14:49:08 -0600 (MDT) (envelope-from gibbs@caspian.plutotech.com) Message-Id: <199909102049.OAA03111@caspian.plutotech.com> X-Mailer: exmh version 2.0.2 2/24/98 To: Andrew Gallatin Cc: "Justin T. Gibbs" , scsi@freebsd.org, gibbs@freebsd.org, anderson@cs.duke.edu Subject: Re: data corruption when using aic7890 In-reply-to: Your message of "Fri, 10 Sep 1999 16:44:45 EDT." <14297.27236.577546.795593@grasshopper.cs.duke.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 10 Sep 1999 14:49:08 -0600 From: "Justin T. Gibbs" Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >This does seem to have an effect, so you might have the right knob to >twiddle! > >Unfortunately, the change seems to make things even worse. The >errors are occurring much more freqently now. Also, the errors are >occuring later in the page. Where as before, the errors would almost >always occur in the first 500 bytes of the page, now they're occuring >near the end of the page (some around 2500 bytes, most near 3900). What are the dynamics of your test program? Are you sure that this is a problem with reads and not with writes? If it is a problem with reads, WR_DFTHRSH is what you should be tweaking, since the directions are relative to the bus master (i.e. the aic7xxx part). -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message