I have enabled the real-time scheduling in my PCs. And my USRPs are connected to PCs via direct link of a Gigabyte ethernet card.
I am now trying the volk. -- Yang, Qing Information Engineering, CUHK 2012/8/7 Nathan West <nathan.w...@okstate.edu> > On Tue, Aug 7, 2012 at 10:12 AM, <mle...@ripnet.com> wrote: > >> ** >> >> On 06 Aug 2012 17:59, Alex Zhang wrote: >> >> Just state, I was using the tunnel.py instead of the rawOFDM to do the >> test. Seems nobody declared good bitrate within this community, although I >> have asked for many times. >> >> >> >> -- >> >> Alex, >> *Dreams can come true – just believe.* >> >> Nobody has answered because there is no single answer. Your achievable >> performance depends on too many factors for anyone to come up with a >> reasonable answer. >> >> Different computers, with very different performance levels, different OS >> distributions with different optimizations in different parts of the >> kernel. And that's ignoring any of the path distortions that may be >> present between your radios. >> >> The fact is that general-purpose operating systems aren't well-optimized >> for real-time, high-bandwidth, digital signal processing, even on systems >> where the "raw" compute power would seem to be adequate. The path lengths >> (in terms of number of executed instructions) between data sources and the >> calculations are much longer than they would be in a compute environment >> optimized for the job. >> >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > Agreed, which is why there is general advice, like enabling real-time > scheduling for non-root users: > http://lists.gnu.org/archive/html/discuss-gnuradio/2010-07/msg00463.html > > You should also run volk_profile : > http://gnuradio.org/redmine/projects/gnuradio/wiki/Volk > > And if you think the link between the USRP and your PC is an issue you > shouldn't use any kind of hub/switch. > > -Nathan >
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