From owner-freebsd-hackers  Sun Mar  1 19:35:13 1998
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Date: Sun, 1 Mar 1998 22:39:27 -0500 (EST)
From: Thomas David Rivers <rivers@dignus.com>
Message-Id: <199803020339.WAA03710@lakes.dignus.com>
To: dyson@FreeBSD.ORG, hackers@FreeBSD.ORG, hasty@rah.star-gate.com,
        rivers@dignus.com, tlambert@primenet.com
Subject: Re: The 'dave rivers' memorial panic.
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John Dyson said:
> 
> Terry Lambert said:
> > 
> > We thought it was a bug in fsck and in the CG code.
> > 
> > It turned out to be a longer-than-functional IDE cable.
> > 
> > Try using a shorter IDE cable.
> > 
> Slightly off subject:
> 
> Even though Ultra-DMA/33 doesn't have higher clockrates than
> 16MHz EIDE (Mode 4), it seems that the Promise controller and
> WD drives DO NOT like out-of-spec IDE cables when running
> Ultra-DMA/33.  (Ultra-DMA uses both edges of the clock, so
> there can be more transitions than EIDE, and the spectrum
> will be higher in freq, also with more sensitivity to clock
> skew, due to timing constraints.)
> 

 Umm... I don't know anything about this - but just a reminder;
my "memorial" panic occurs with SCSI devices.... (but, I do have
a reproduction on IDE as well.)   Julian had mentioned he'd seen
reproductions on different devices - but I didn't see the particulars.

 Or, are you guys discussing something else?

	- Dave Rivers -


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