Date: Wed, 19 Jun 1996 05:16:26 -0400 From: "Jacob M. Parnas" <jparnas@jparnas.cybercom.net> To: sos@freebsd.org Cc: alex@fa.tdktca.com (Alex Nash), bmk@fta.com, Eloy.Paris@ven.ra.rockwell.com, questions@freebsd.org, hardware@freebsd.org, hal@wwa.com Subject: Re: FreeBSD works with Cy486DLC processors? Message-ID: <199606190916.FAA02005@jparnas.cybercom.net> In-Reply-To: Your message of Tue, 18 Jun 1996 13:45:57 %2B0200. <199606181145.NAA18166@ra.dkuug.dk>
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In message <199606181145.NAA18166@ra.dkuug.dk>you write: >In reply to Alex Nash who wrote: >> >> Brant M. Katkansky wrote: >> > >> > > I installed FreeBSD 2.1.0-RELEASE a couple of weeks ago and since then I >> > > have been having programs exiting with signals 10 and 11, making my system >> > > too unstable to work as a dedicated e-mail server and as a PPP to Ethernet >> > > gateway. >> > >> > [snip] >> > >> > I had one given to me not too long ago. Mine is plagued with various >> > sig 10 and 11's, same as yours. >> > >> > Here's the interesting part - disabling the internal and external cache >> > makes the problem worse. >> >> This should be fairly easy to explain: You have bad SIMMs. While your >> program is running, erroneous results are returned from RAM and the >> processor tries to execute them. Your program subsequently seg faults >> due to an invalid instruction. If your cache works properly and your >> SIMMs don't, the cache can mitigate these effects since RAM accesses are >> less frequent (thus missing the odd inverted bit somewhere :) ). Disable >> the caches and now you will be much more likely to see a bad SIMM in action. >> > >Hmm, just to add another datapoint: >I can run 2.1 on my 486DLC board, but -current will panic within >2 minutes with a page fault or semilar. I have a very strong >feeling that our Cyrix/486DLC support leaves much to be desired, >as I can make the system run better (not error free) if I disable >the Cyrix code in locore.s. It seems that using the BIOS defaults >(both caches on) runs alot better than what we are trying to do >to it..... >-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- >Soren Schmidt (sos@FreeBSD.org) FreeBSD Core Team > So much code to hack -- so little time. > You might try reinserting the SIMMS. I remember that we bought tons of expansion SIMMs for hundreds of computers, and not once did an original or memory upgrade SIMM become defective even after years of use. Jacob
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