I have been playing with ioctl's today and while browsing the USRP2-
code i found that max length of a packet is defined to 371 which results
in 1484 bytes of "data", and 16 bytes left, leaving room for the 14 byte
ethernet header, but not a 372:nd sample, since each sample is 4 bytes.
But when I look at the output of ifconfig my MTU is set to 1500, but
when I print out how much data is received from a raw socket (listening
to some random network traffic), it tells me it reads max 1514 bytes,
which I figured is 1500 bytes of data, and 2*6 bytes mac- addresses + 2
bytes of protocol. This gives me two questions. Is there (probably)
something I missed here, or should we be able to increase U2_MAX_SAMPLES
to 375 (1500/4 = 375), not that four samples might make a huge
difference in the end, but still... And the other question, shouldn't
one check for the MTU set by the nic and calculate this number, instead
of having it #defined? But then again, it would be a whole lot of re-
writing, since U2_MAX_SAMPLES is #defined... Or have I missed some
fundamental here?
BR
Mattias Kjellsson
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