Date: Mon, 1 Apr 1996 23:15:00 -0800 (PST) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: msmith@atrad.adelaide.edu.au (Michael Smith) Cc: cschuber@orca.gov.bc.ca, freebsd-hardware@FreeBSD.org Subject: Re: Parity Errors Message-ID: <199604020715.XAA03313@GndRsh.aac.dev.com> In-Reply-To: <199604020145.LAA08833@genesis.atrad.adelaide.edu.au> from Michael Smith at "Apr 2, 96 11:15:29 am"
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> Cy Schubert - ITSD Open Systems Group stands accused of saying: > > > 4.x, and Linux (1.1, 1.2, and 1.3) without any parity errors. The > > QA Plus diagnostic package, which I've used to find many parity > > errors before, e.g. when purchasing memory upgrades, did not > > complain about any problems. > > Diagnotics like QAPlus aren't worth spit. They don't exercise memory > in any of the dozens of interesting ways that 'real' operating systems > do. And they can't test memory like a real memory tester either. I can show you sticks of simms that run QAPlus for weeks on end but fail under FreeBSD and fail in a simm tester. ... > > I can configure the machine for memory and/or cache read or write > > wait states independently. Should I add a wait state and where, > > memory or cache, read or write? > > If you can disable parity checking with your BIOS, do that. DO NOT DO THIS! Ignoring a hardware fault indicated by the motherboard logic is asking for more problems that it will ever solve. This _CAN_ lead to SERIOUS file system corruption! > Failing that, > wind your main memory read and write waitstates out as slow as they'll go, > and if you can add DMA waitstates then do that too. Wind them out 1 step at a time, going overboard can cause more problems than it solves. Start with the BIOS setup defaults, if you have tweaked these down to zero from a default of 1 it is most likely the cause of your problem. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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