linux-kernel - Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

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Message-ID: <460BB958.4070307@free.fr>
Date:	Thu, 29 Mar 2007 15:04:24 +0200
From:	John <linux.kernel@...e.fr>
To:	linux-kernel@...r.kernel.org
CC:	Lee Revell <rlrevell@...-job.com>, mingo@...e.hu, akpm@...l.org,
	linux-apps@...r.kernel.org, linux.kernel@...e.fr
Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

Lee Revell wrote:

> John wrote:
> 
>> Would someone know how to disable SMM in this BIOS?
> 
> There's no generic way.

I understand. Would someone know how to disable SMM in the VIA Pro133T 
chipset (VT82C596B south bridge). What I/O ports do I need to write to, 
and what values should I write to these ports?

> Try disabling USB keyboard emulation and any unused peripherals.

I have disabled everything I could find in the BIOS. Serial and parallel 
ports, USB, integrated sound, APM, ACPI, booting from exotic hardware or 
from the network. To no avail :-(

> Also google "RTAI disable SMM".

I see that they have a Linux kernel module to disable SMM in Intel 
chipsets. But I didn't see the equivalent for VIA chipsets.

>>> Is this a laptop?  They are plagued with SMM problems...
>>
>> No it is an "indutrial" motherboard.
>> Although I don't know what makes it "industrial".
> 
> One would really hope that such a device would be designed for machine
> control and similar RT apps and thus free of SMM...

Indeed...

I wonder if VIA thinks their old chipsets were industrial-grade.

Regards.
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