George- >> Thanks for the reply George. I'm still looking for a little more >> information on this topic. >> >> - What is PMT > > http://gnuradio.org/redmine/wiki/1/TypePMT > >> - Why was m-block removed > > http://osdir.com/ml/discuss-gnuradio-gnu/2010-01/msg00066.html > >> - Has anyone measured latency with the USRP2 and GigE > > I'm not sure. > >> - Is GigE alone not capable of handling MAC turnaround times or is >> software to blame for this > > I think the latency is on hundreds of microseconds, which is greater than, > say, an 802.11 ACK turnaround time (24us).
I would tend to blame Linux and buffering more than GbE itself (MAC + PHY). Here is an interesting doc where the researchers were asking similar questions: http://www.hep.man.ac.uk/u/rich/atlas/docs/atlas_net_note_draft5.pdf I'm not sure yet how much buffering is done in the USRP2 firmware but we hope to know shortly as a couple of our guys are in the process of taking apart the logic, pulling out non-GbE related sections, and rebuilding. -Jeff _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
