[PATCH] Machine Check Architecture on amd64
Suleiman Souhlal
ssouhlal at FreeBSD.org
Tue Jun 26 01:55:16 UTC 2007
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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