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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: |
Wed, 7 Apr 2010 11:37:38 -0500 (CDT) |
User-agent: |
SquirrelMail/1.4.2-1 |
Marcus-
> On 04/06/2010 09:44 PM, John Gilmore wrote:
>>> Which part of the Linux issue... sustained throughput or latency? I
>>> wouldn't be surprised to find that latency
>>> hasn't
>>> improved substantially because it's not a priority for server software.
>>> Even VoIP applications are not concerned
>>> about a 1 msec improvement... whereas that makes or breaks a wireless MAC.
>>>
>>
> Simple test. Core 2 Duo system, 2.33GHz, Fedora 11.
>
> A 1500 byte ping test to localhost yields an average RTT of about
> 33usecs. That tests most of
> the network stack except for hardware interfaces, and gives you some
> notion of "best case"
> for latency/turn-around time.
>
> If MACs have requirements that are more aggressive than 20-50usec
> turnaround time, then relying
> purely on software in a running general-purpose operating system, even
> on relatively-good hardware
> may be optimistic.
I think there is no way to avoid that MAC-related processing has to be done
prior to the server motherboard.
-Jeff
Re: [Discuss-gnuradio] MAC layer development and USRP2, Veljko Pejovic, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Jeff Brower, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Veljko Pejovic, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, George Nychis, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Philip Balister, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, Jeff Brower, 2010/04/06
- Re: [Discuss-gnuradio] MAC layer development and USRP2, George Nychis, 2010/04/06