[linux-dvb] Flooding interrupts

Manu Abraham abraham.manu at gmail.com
Tue Sep 26 12:48:49 CEST 2006

Hartmut Hackmann wrote:
> Hi,
> Jimmy Hedman wrote:
>> Hi,
>> I have a Compro DVB-T 300 which uses the saa7134-dvb-driver. When it's
>> tuned it is flooding my system with between 12000 and 16000 interrupts a
>> second. It works, but that amout of interrupts doesn't sound healty. Any
>> ideas what this could be?
>> Many thanks in advance,
>> Jimmy Hedman
> The streaming DMA causes loads of interrupts, but not that many.

Whether it be consistent or streaming, this has nothing to do with the
interrupt count. The only case when you have too many interrupts is when
your buffers are too small, causing the device requesting the host to
read from the DMA buffers.

> For DVB-T you should expect about 70 per sec, and for analog, its
> up to 50 per sec for 50Hz systems.
> The only other valid interrupt source are the GPIOs (Remote control).
> If there really are so many interrupts, there must be something wrong
> with the GPIO config but i don't think so.


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