saa7130. how many buffers?

Hi all,
I am working with a saa7130 based capture board. It has four saa7134 grabbing video from four different cameras.
I want to grab 25 fps from each camera. I have realized that saa7130 driver uses four video buffers, although you can set more buffers per device.

How many buffers should I use? are four buffers enough? Is there any way check if driver is lacking buffers during capture process?

Thanks in advance.

Paco

One of my most productive days was throwing away 1000 lines of code (Ken 
Thompson)
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