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Date: Tue, 26 Jun 2007 08:55:20 +0200
From: Ed Schouten <ed@fxq.nl>
To: Suleiman Souhlal <ssouhlal@FreeBSD.org>
Message-ID: <20070626065520.GQ27942@hoeg.nl>
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Subject: Re: [PATCH] Machine Check Architecture on amd64
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* Suleiman Souhlal <ssouhlal@FreeBSD.org> wrote:
>  Hi,
>=20
>  I have a simple patch for amd64 that uses the Machine Check=20
>  Architecture/Exceptions on most recent x86 CPUs to detect memory errors:
>=20
>  http://people.freebsd.org/~ssouhlal/testing/mce-20070621.diff
>=20
>  It will report uncorrected and corrected errors (the latter, only if sys=
ctl=20
>  machdep.mce.log_corrected=3D1).
>  You can ask the kernel to panic if it gets an uncorrected error by setti=
ng=20
>  machdep.mce.panic_on_uc=3D1.
>  All this can be disabled by setting the machdep.mce.enable tunable to 0.=
 I'm=20
>  still not sure if I want this enabled by default, as I don't have any In=
tel=20
>  machines to test this on, but I have tested it on Opteron (both correcte=
d=20
>  and uncorrected errors).
>=20
>  I would appreciate it if someone would try this, especially if you have=
=20
>  Intel machines with bad RAM.
>=20
>  Comments are welcome.

|	/*
|	 * Uncorrected MCEs will generate a #MC, while corrected
|	 * don't, so we have to periodically poll for them.
|	 */

What about adding an option to only print uncorrected MCE's? That's the
most interesting data and we can get that without using a kthread,
right?

Nice work! :-)

--=20
 Ed Schouten <ed@fxq.nl>
 WWW: http://g-rave.nl/

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