[linux-dvb] Reading in 188 byte chunks?

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

Hello!

The API-documentation says that reading from /dev/dvb/adapterX/dvrY is to
be done in 188 byte chunks.  On an average stream (4Mbps), this results in 
about 2660 system calls per second.  Receiving a whole transponder with
27.5Msym/s (that is 55Mbps) results in 36570 syscalls per second.  Since
syscalls are expensive operations, this seems to be a pretty big overhead
to me.

Is there any reason _not_ to return all available packets?  I'd pretty
much prefer to read(dvrfd,buf,188*100) (in nonblocking mode) and get
all available packets in just one call.

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-- Josef Wolf -- jw@raven.inka.de --