linux-kernel - Re: [PATCH -v2 2/2] x86, MCE: Drop the default decoding notifier

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Date:	Tue, 26 Apr 2011 09:42:38 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Borislav Petkov <bp@...64.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>,
	EDAC devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Nagananda Chumbalkar <Nagananda.Chumbalkar@...com>,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH -v2 2/2] x86, MCE: Drop the default decoding notifier

On Mon, Apr 25, 2011 at 03:40:11PM -0400, Eric W. Biederman wrote:
> > From: Borislav Petkov <borislav.petkov@....com>
> > Date: Wed, 13 Apr 2011 14:32:06 +0200
> > Subject: [PATCH -v2.1 2/2] x86, MCE: Drop the default decoding notifier
> >
> > The default notifier doesn't make a lot of sense to call in the
> > correctable errors case. Drop it and emit the mcelog decoding hint only
> > in the uncorrectable errors case and when no notifier is registered.
> > Also, limit issuing the "mcelog --ascii" message in the rare case when
> > we dump unreported CEs before panicking.
> >
> > While at it, remove unused old x86_mce_decode_callback from the
> > header.
> 
> Can we please print something if we please log something in the
> case of a correctable error, when we only report it via mcelog?
> 
> I have a stupid recent intel cpu here that hits that case and without
> the default x86_mce_decode_callback I wouldn't have even known that I am
> getting something like 50 correctable errors an hour on one of my
> machines.  In particular I am it hits so often I am seeing:
> "mce_notify_irq: 2 callbacks suppressed".  I need to get those dimms
> replaced soon because in a new product I simply can't imagine that many
> correctable errors.

Isn't there a mcelog daemon or something that polls /dev/mcelog and
tells you about those DRAM ECCs in some log file where you're supposed
to look? :)

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
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Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
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