linux-kernel - Re: [PATCH 1/13] EDAC i5100 new intel chipset driver

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Message-ID: <20080630152340.GH10571@ajones-laptop.nbttech.com>
Date:	Mon, 30 Jun 2008 08:23:40 -0700
From:	Arthur Jones <ajones@...erbed.com>
To:	Doug Thompson <norsk5@...oo.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"bluesmoke-devel@...ts.sourceforge.net" 
	<bluesmoke-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/13] EDAC i5100 new intel chipset driver

Hi Doug, ...

On Fri, Jun 27, 2008 at 11:15:06PM -0700, Doug Thompson wrote:
> 
> --- Andi Kleen <andi@...stfloor.org> wrote:
> 
> > dougthompson@...ssion.com writes:
> > >
> > > 2)  I have not yet tackled the de-interleaving of the
> > > rank/controller address space into the physical address
> > > space of the CPU.  There is nothing fundamentally missing,
> > > it is just ending up to be a lot of code, and I'd rather
> > > keep it separate for now, esp since it doesn't work yet...
> > >
> > > 3)  The code depends on a particular i5100 chip select
> > > to DIMM mainboard chip select mapping.  This mapping
> > > seems obvious to me in order to support dual and single
> > > ranked memory, but it is not unique and DIMM labels
> > > could be wrong on other mainboards.  There is no way
> > > to query this mapping that I know of.
> >
> > Since there's a non negligible probability that the output
> > of this driver is completely misleading because of (2) and (3)
> > and probably (4) too [reporting the wrong DIMMs etc.]
> > would it be possible to add some flag to EDAC that
> > warns the user that the output is not fully reliable?\
> 
> good idea.
> 
> Arthur, could you add some more text to the driver's output, before the call to the
> core's output function, doing exactly that? Explaining just what you DO know, and what you don't
> know?

Would it make sense to leave the DIMM labeling in, but
conditional on a mainboard whitelist/blacklist?  E.g., I
know the mapping on my mainboard is correct and I can get
that info from DMI.  The thing is, it's very hard to know
what DIMM went bad from the bank/rank/controller info
in the dmesg output.

What do you think?  It's a lot of work, but it may be
worth it?

Arthur

> > -Andi (who can just see people replacing the wrong DIMMs and
> > then blaming Linux)
> >
> >
> 
> 
> W1DUG
> 
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