[PATCH] Machine Check Architecture on amd64
ed at fxq.nl
Tue Jun 26 06:55:22 UTC 2007
* Suleiman Souhlal <ssouhlal at FreeBSD.org> wrote:
> I have a simple patch for amd64 that uses the Machine Check
> Architecture/Exceptions on most recent x86 CPUs to detect memory errors:
> It will report uncorrected and corrected errors (the latter, only if sysctl
> You can ask the kernel to panic if it gets an uncorrected error by setting
> 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.
| * Uncorrected MCEs will generate a #MC, while corrected
| * don't, so we have to periodically poll for them.
What about adding an option to only print uncorrected MCE's? That's the
most interesting data and we can get that without using a kthread,
Nice work! :-)
Ed Schouten <ed at fxq.nl>
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