Date: Fri, 10 Sep 1999 14:49:08 -0600 From: "Justin T. Gibbs" <gibbs@caspian.plutotech.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, scsi@freebsd.org, gibbs@freebsd.org, anderson@cs.duke.edu Subject: Re: data corruption when using aic7890 Message-ID: <199909102049.OAA03111@caspian.plutotech.com> In-Reply-To: Your message of "Fri, 10 Sep 1999 16:44:45 EDT." <14297.27236.577546.795593@grasshopper.cs.duke.edu>
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>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
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