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

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Message-ID: <20070329223309.26f43c73@the-village.bc.nu>
Date:	Thu, 29 Mar 2007 22:33:09 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Lee Revell" <rlrevell@...-job.com>
Cc:	"Kevin Perros" <kevin.perros@...e.fr>, John <linux.kernel@...e.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

> The problem could also be something other than SMM, like DMA
> starvation by a video or disk controller.  Try disabling all hard
> drive controllers and booting from a CD or USB stick.

You'll get starvation from the disk DMA but only if you are using the
disk and doing DMA otherwise it won't have much effect. If you drop the
older VIA's down to about UDMA33 or UDMA66 they normally behave
themselves. This is a problem folks see with the older boards and video
capture particularly
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