linux-kernel - Re: [RT] [RFC] simple SMI detector

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Message-ID: <75b66ecd0901231833j2fda4554sb0f47457ab838566@mail.gmail.com>
Date:	Fri, 23 Jan 2009 21:33:37 -0500
From:	Lee Revell <rlrevell@...-job.com>
To:	Jon Masters <jcm@...hat.com>
Cc:	linux-rt-users@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
Subject: Re: [RT] [RFC] simple SMI detector

On Fri, Jan 23, 2009 at 5:55 PM, Jon Masters <jcm@...hat.com> wrote:
> Here's a simple SMI detector we've been playing around with internally.
> In case anyone wants to play with it, and especially help clean it up :)
>
> SMI events are particularly unhelpful on Real Time systems because we
> effectively have the CPU stolen from under us. We can't prevent this
> easily without BIOS vendors/system vendor co-operation, but we can help
> to diagnose and log that these are occuring...which can be very helpful
> too.
>

FYI the RTAI project has a patch to allow disabling of SMI:

https://listas.upv.es/pipermail/rtlinuxgpl/2007-April/000609.html

Lee
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