linux-kernel - Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so far

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Message-ID: <46002247.8020504@myrealbox.com>
Date:	Tue, 20 Mar 2007 11:04:55 -0700
From:	Andy Lutomirski <luto@...ealbox.com>
To:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
CC:	Eric St-Laurent <ericstl34@...patico.ca>,
	Lee Revell <rlrevell@...-job.com>, tglx@...utronix.de,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>, Len Brown <lenb@...nel.org>
Subject: Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so
   far

Arjan van de Ven wrote:
> On Tue, 2007-03-20 at 01:36 -0400, Eric St-Laurent wrote:
>> On Tue, 2007-20-03 at 01:04 -0400, Lee Revell wrote:
>>
>>> I think CONFIG_TRY_TO_DISABLE_SMI would be excellent for debugging,
>>> not to mention people trying to spec out hardware for RT
>>> applications...
>> There is a SMI disabling module in RTAI, check the smi-module.c in this:
>>
>> https://www.rtai.org/RTAI/rtai-3.5.tar.bz2
>>
>> More infos:
>>
>> http://www.captain.at/rtai-smi-high-latency.php
>> http://www.captain.at/xenomai-smi-high-latency.php
>>
>> It might make sense to merge this code, at least in the -rt tree.
> 
> it NEVER makes sense to disable SMM.
> 
> SMM is there to ensure that your hardware doesn't get physically
> damaged.
> 
> disabling that is a BAD idea. I'm no fan of SMM myself, but it's there,
> and we have to live with it. Disabling it without knowing what it does
> on your system is madness.
> 

How about disabling it long enough to calibrate the timers and then 
turning it back on?

--Andy

(apologies if anyone gets duplicates of this.  i'm encountering 
nightly-thunderbird-build bugs.)
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