linux-kernel - RE: [PATCH 3/3] ie31200

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Date:	Wed, 9 Apr 2014 22:44:21 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Jason Baron <jbaron@...mai.com>
CC:	Borislav Petkov <bp@...en8.de>, Aristeu Rozanski <aris@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"m.chehab@...sung.com" <m.chehab@...sung.com>,
	"mitake@....info.waseda.ac.jp" <mitake@....info.waseda.ac.jp>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] ie31200_edac: Add driver

> So when the driver sees uncorrected errors, I'm also seeing them in my
> memory scanning program - so they correspond nicely. I didn't see anything
> logged in /var/log/mcelog, but I will update to the latest when possible.

I wonder if there are some BIOS options to enable reporting via CMCI/MCE?
On the E5 systems the reference BIOS uses phrases like "poison forwarding"
in the option names.

The above behavior sounds less than useful.

Scenario: Your mission critical app is running (controlling a giant laser cutter).
Oops there is a memory error, and the bad data arrives at the application causing
it to swing the laser beam through 180 degrees, destroying half of your lab.
A few seconds/minutes later - your EDAC driver prints a message saying that
the uncorrected error count just got incremented.

-Tony