linux-kernel - Re: Hardware Error Kernel Mini-Summit

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Message-ID: <20100524182603.GA3429@gargoyle.fritz.box>
Date:	Mon, 24 May 2010 20:26:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Russ Anderson <rja@....com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	"Young, Brent" <brent.young@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Doug Thompson <dougthompson@...ssion.com>,
	Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...e.hu>,
	"bluesmoke-devel@...ts.sourceforge.net" 
	<bluesmoke-devel@...ts.sourceforge.net>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>
Subject: Re: Hardware Error Kernel Mini-Summit

> Having the infrastructure to automatically off-line pages
> is a good thing.  The details of where to set the predictive

It's already there with a modern mcelog in daemon mode 
and a recent kernel that supports soft offlining.

> threshold likely will be hardware specific (different DIMM
> types failing at different rates).  It needs to be adjustable.

The current default in mcelog is 10 corrected errors per 24h
per 4k page or 1 uncorrected error on the page (if your CPU
supports recovering from that).  It is on by default. 

You can configure it to be different if you want.

-Andi
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