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References: <1232751312.3990.59.camel@perihelion.bos.jonmasters.org>
Date: Fri, 23 Jan 2009 21:33:37 -0500
Message-ID: <75b66ecd0901231833j2fda4554sb0f47457ab838566@mail.gmail.com>
Subject: Re: [RT] [RFC] simple SMI detector
From: Lee Revell <rlrevell@joe-job.com>
To: Jon Masters <jcm@redhat.com>
Cc: linux-rt-users@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
       williams <williams@redhat.com>,
       "Luis Claudio R. Goncalves" <lgoncalv@redhat.com>
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On Fri, Jan 23, 2009 at 5:55 PM, Jon Masters <jcm@redhat.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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