[linux-dvb] Re: Strange buffer overruns...

[Josef Wolf <jw@raven.inka.de>]

On Wed, Dec 01, 2004 at 12:13:52PM +0100, Robert Schlabbach wrote:
> From: "Josef Wolf" <jw@raven.inka.de>
> > I experience strange buffer overruns.  I have:
> > - Called DMX_SET_BUFFER_SIZE to set 256*1024 byte buffer.
> 
> What DVB CARD do you use? If you're using one of the TechnoTrend "budget"
> cards, try 188*1024, since that is the "chunk size" in which the hardware
> delivers the DMA buffers. With 256*1024, you're requesing one DMA buffer
> and a fraction of the next, and since the DMA is somewhat time-critical on
> the budget designs, especially on your relatively slow 450MHz CPU, that
> might cause overruns.

Your guess is perfectly correct: I have TechnoTrend budget.  I tried with
188*1024, but the problem remains.  From the symptomps it looks more related
to IDE than to the DVB driver.

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