Date: Thu, 28 Sep 1995 16:26:01 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: andreas@knobel.gun.de (Andreas Klemm) Cc: davidg@Root.COM, stable@freebsd.org Subject: Re: make world on FreeBSD-stable impossible. cc1: ... signal 11 Message-ID: <199509282326.QAA06048@GndRsh.aac.dev.com> In-Reply-To: <199509282043.VAA02883@knobel.gun.de> from "Andreas Klemm" at Sep 28, 95 09:43:42 pm
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> > > > >Instead of ( int something there was a ( xnt something > > > > > > Did the above control character munge happen to be on a system with > > a wide 2940 in it??? If so turn off wide or drop the sync negotiation > > rate to 5Mhz in scsi-select. There is a bug in the 2940W sequencer code > > known to cause data corruption when running wide drives at this time. > > In this case it was the P90 CPU that caused that mess. I clocked it > down to 75 MHz, since then no trouble. 2 make worlds ran perfectly. > > My hardware: AHA 2940 (not wide), Quantum Grand Prix, ASUS P55TP4XE, > 256k burst cache, 32 MB 70ns,.... ^^^^^^^^^^^^^^^^^^ If you have to clock it down to work at 75MHz I highly suspect you have a defective cache module. :-( I also see 70nS memory in there, that is only good to 90Mhz, and it _must_ meet the 70nS t(RAC) timeing or it will cause problems, even 71nS is enough to cause you problems at 90Mhz, 61nS causes problems at 100Mhz. I now use high quality life time warrantied memory in all of my systems because I was seeing memory related problems and after running some of it on a real simm tester and seeing slightly over spec T(RAC) times I decided it was time to do the right things. > Thanks especially to you Rod ... Your hint, that it might be hardware > problems, caused me to do the trickiest things, even to clock down > the CPU ... and ... it works !! I am glad it works, I am sad about what you had to do to make it work as it indicates a timing related problem in some piece of hardware :-(. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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