Date: Sat, 28 Aug 1999 10:53:37 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, hackers@FreeBSD.ORG Subject: Re: Should cam_imask be part of bio_imask ? Message-ID: <Pine.BSF.4.05.9908281048170.8884-100000@semuta.feral.com> In-Reply-To: <199908281746.KAA05365@apollo.backplane.com>
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I strongly doubt that this is a CAM isr problem- the error pattern isn't
entirely clear from what you said, but it looks more like a FIFO or CACHE
LINE sized type of problem- it looks to be < 16 bytes, but not a short
count. Because this isn't one of the wacky systems I spent most of my
career on at Sun where the first and usual suspect was a system memory
cache line because IO wasn't cache coherent on Suns between the Sun
3/{50,60,75,150} and the advent SuperSparc Viking Chipset, I'd guess a
FIFO somewhere in the I/O movement path.
Justin- any changes lately where flushing a FIFO in the Adaptec at the end
of tranfer might have been spoodged?
-matt
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