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

Oliver Endriss o.endriss at gmx.de
Fri Mar 17 08:57:17 CET 2006

Ingo Schneider wrote:
> Hello again !
> 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>
> Oliver, can you please integrate this patch ?

Sorry for the delay.

This weekend I will do some tests with different buffer settings.
Unfortunately, I can only test Activy GR and old-style Nova hardware
(budget driver).

I'd appreciate if more people would test the patch with different
hardware (budget-ci, budget-av, budget-patch driver).
Please report _any_ problems. Thanks.

Anyway, I still don't like the way buffer warnings are logged.
syslog might be flooded with 100 buffer warnings in worst case.

I will make error logging rate-limited, i.e. no more than one message
every 30 seconds will be logged. The error counter will be cleared after
logging the message. That should be sufficient to detect any problems.


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