Re: [rtl] using RTLinux for video stream handling

["Hermann Lauer" <Hermann.Lauer@IWR.Uni-Heidelberg.De>]

On Nov 3,  9:48pm, David Schleef wrote:
...
> >
> > Is there some code around to measure the latency of interrupts handling
> > in regular Linux (2.0.34), and have somebody done a reserach on that?
> >
>
> Yes.  There was a discussion about interrupt latency about a month ago
> on linux-kernel.  I think the typical latency was on the order of
> microseconds, with the occasional IDE-induced blip.

Are there some information available on the net about PCI latency ? I have had
trouble with a framegrabber application and X:

The framegrabber ist programmed as busmaster and transfers the data to main
memory. Running X is possible, but if I changed the X screens there are data
losses on the framegrabber transfer. My guess is, that the X-server post's the
complete screen to the video card and hoogs up the PCI Bus during that
transfer...

Thanks for any pointers/help on this subject.

Greetings

   Hermann
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