[linux-dvb] Re: PATCH for SAA7146 DMA buffer overflow in budget cards (updated)

Reinhard Nissl rnissl at gmx.de
Sat Mar 4 13:32:19 CET 2006


Ingo Schneider wrote:

> Here comes a Patch which does the following changes for all ttpci budget 
> cards:
> - Issue a warning when more than 80% of the DMA buffer is being used 
> (probably due to bad IRQ latency)
> Warnings are limited to the first 100 warnings and after that one 
> warning for every 100 buffer overruns.
> - Introduce a new parameter "bufsize" (in k) which increases the default 
> DMA buffer of 188k up to 4 MB
> A buffer size of 470k does it for me even at high I/O load conditions.
> - Now the patch doesn't break budget-patch anymore
> Signed-off-by: Ingo Schneider <mail at ingo-schneider.de>

I'm running this patched (bufsize=470) version for more than 3 hours now 
and VDR hasn't reported any TS discontinuities so far while watching TV HD.

Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl at gmx.de

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