Date: Tue, 18 Jun 1996 07:46:49 -0700 (PDT) From: "Brant M. Katkansky" <bmk@fta.com> To: alex@fa.tdktca.com (Alex Nash) Cc: 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: <199606181446.HAA02502@everest.dtr.com> In-Reply-To: <31C69327.32639FD9@fa.tdktca.com> from "Alex Nash" at Jun 18, 96 06:29:43 am
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> 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. That hadn't occurred to me - I was operating under the assumption that the board was garbage. I'll swap out the RAM and see what happens...
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