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Re: [Discuss-gnuradio] MAC layer development and USRP2
From: |
Jeff Brower |
Subject: |
Re: [Discuss-gnuradio] MAC layer development and USRP2 |
Date: |
Tue, 6 Apr 2010 10:33:38 -0500 (CDT) |
User-agent: |
SquirrelMail/1.4.2-1 |
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
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Charles Irick, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, George Nychis, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2,
Jeff Brower <=
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Charles Irick, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Jeff Brower, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, John Gilmore, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Marcus D. Leech, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Jeff Brower, 2010/04/07
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Jeff Brower, 2010/04/07
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Per Zetterberg, 2010/04/07
- Re: [Discuss-gnuradio] MAC layer development and USRP2, George Nychis, 2010/04/07
Re: [Discuss-gnuradio] MAC layer development and USRP2, Veljko Pejovic, 2010/04/06