Date: Mon, 25 Jun 2007 18:26:22 -0700 From: Suleiman Souhlal <ssouhlal@FreeBSD.org> To: current@freebsd.org Subject: [PATCH] Machine Check Architecture on amd64 Message-ID: <46806B3E.2060701@FreeBSD.org>
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Hi, I have a simple patch for amd64 that uses the Machine Check Architecture/Exceptions on most recent x86 CPUs to detect memory errors: http://people.freebsd.org/~ssouhlal/testing/mce-20070621.diff It will report uncorrected and corrected errors (the latter, only if sysctl machdep.mce.log_corrected=1). You can ask the kernel to panic if it gets an uncorrected error by setting machdep.mce.panic_on_uc=1. All this can be disabled by setting the machdep.mce.enable tunable to 0. I'm still not sure if I want this enabled by default, as I don't have any Intel machines to test this on, but I have tested it on Opteron (both corrected and uncorrected errors). I would appreciate it if someone would try this, especially if you have Intel machines with bad RAM. Comments are welcome. -- Suleiman
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