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Subject: Re: Attempted summary of "RT patch acceptance" thread
From: Lee Revell <rlrevell@joe-job.com>
To: Bill Huey <bhuey@lnxw.com>
Cc: Zwane Mwaikambo <zwane@arm.linux.org.uk>,
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Date: Fri, 10 Jun 2005 19:46:11 -0400
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On Fri, 2005-06-10 at 16:41 -0700, Bill Huey wrote:
> On Fri, Jun 10, 2005 at 05:36:10PM -0600, Zwane Mwaikambo wrote:
> > What's wrong with the memory controller on the G5?
> 
> DMA starvation

DMA starvation has also been observed with some PC chipsets during
PREEMPT_RT development and the cause was traced to the UDMA133
controller.  The symptom is latency traces that seem to go in extreme
"slow motion".  Check the archives for the hardware affected.

Lee