On Wed, Jun 22, 2005 at 12:40:06PM +0200, Harald Welte wrote: > On Tue, Jun 21, 2005 at 04:10:35PM -0700, John Gilmore wrote: > > What thruput do YOU see using a good GigE card under Linux? Can you move > > 100 Mbytes/sec from user process to user process with TCP, across two GigE > > interfaces and a GigE switch? If so, it's doing much better than USB2 > > ever will, and much better than any version of FireWire. > > I'm usually not doing client-to-server TCP benchmarks over my test > networks, since I'm more interested in small-packet forwarding > performance. I'm sure with the right tuning (and probably some of the > recent work on TCP BIC etc.) you can saturate a 1000-base-tx link with a > single tcp flow, no question on that. > > But at what expense? you copy data back and forth between different > address spaces (kernel/user), you have lots of complex code that deals > with retransmissions, protocol demultiplex, ... that is totally > unneccessarry for the gnuradio/USRP kind of application.
Systems like NetBSD have moved to "zero-copy" TCP. I am surprised if Linux has not done the same. Perhaps more important is that I do not see any reason, in principle, that you cannot do the same for UDP+RTP. (API adaptations may be necessary.) Dave -- David Young OJC Technologies [EMAIL PROTECTED] Urbana, IL * (217) 278-3933 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
