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

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Message-ID: <5345F951.8020603@akamai.com>
Date:	Wed, 09 Apr 2014 21:52:17 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	"Luck, Tony" <tony.luck@...el.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

On 04/09/2014 06:44 PM, Luck, Tony wrote:
>> 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

Agreed, and I don't like the polling either. But so far on this h/w I have not
been able to find a better option.

I also seem to recall, that ce errors tend to proceed ue errors. So, I think
alerting on ce errors can help avoid getting into ue errors.

So IMO there is currently value in this driver, and I know others have
requested support for this h/w in the past (on the edac mailing lists).

I'll see what else I can find once I get the problematic h/w in hand.

Thanks,

-Jason

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