On Mar 29, 2012, at 3:26 AM, Tom Rondeau wrote: > On Wed, Mar 28, 2012 at 10:02 AM, Rickard Radio <rickardra...@gmail.com> > wrote: >> Hi list, >> >> After I upgraded to latest Gnu Radio 3.5.2, and latest UHD (and images), GR >> applications just freeze when running. No warnings, error messages or >> overflows etc. Just freeze. >> A simple FFT plot directly on received samples from the USRPN210 just >> freezes after some seconds, or minutes (depending on the sample rate), >> although the load on the machine is not high. Need to kill GR-app and >> restart it, with the same problem occurring again. >> >> This has never been a problem with earlier versions of GR/UHD, from about 6 >> months ago. >> The freezing happens quicker with high sample rate setting but also with >> lower, eventually. No overflows happen (which was possible to get before >> with too high sample rates or load, etc.) >> >> The USRPN210 stops sending samples to the computer at the same moment as >> GnuRadio freezes (as observed on the system monitor). >> >> Same thing happen on two identical laptops running Ubuntu 10.10 (also >> upgraded it from 10.04). Not sure if its a strict GnuRadio problem (since it >> worked before), UHD, or some problem with the Ubuntu Linux 10.10. It >> work(ed) flawlessly with another machine on OSX (before I tried to upgrade >> GR on it but then got stuck...) with identical UHD version and images. >> >> Installation of UHD+GnuRadio with the automatic linux script runs without >> any problems, as before, no errors or warnings. >> >> Any de-freezing help or clues appreciated! >> >> Rickard > > Rickard, > > Just to be clear. When you install 3.5.2 from the tarball, it freezes. > When you use the build-gnuradio, everything works fine? > > What's your machine? > > Tom
Tom, The installation with build-gnuradio script works just fine, as before (no tarballs). Same result on both laptops, Acer Aspire TimelineX with i3 processors (2.26 GHz), running Ubuntu 10.10. I did not have this problem earlier with Ubuntu 10.04. Or on a Mac with OS X (with the source from git). Could Ubuntu 10.10 cause the problem somehow? Note: Halting/freezing only happens when running an application (with the N210) as a receiver. (Not transmitter, see below.) The flow of receiving samples just halts after a while and the application freezes/halts (as a consequence). This happen sooner with high sampling rate (after a few seconds with 25MSPS), but eventually also with a bit lower sample rates. The CPU's are not overwhelmed (< 50%). It happens even if the UHD usrp source is connected directly to a null sink only. I do not get any overflows before the halt. In fact, I cannot even provoke a continuos stream of overflows since the reception just halts instead of producing overflows, which was the result earlier. GnuRadio itself does not freeze as a whole (like the grc in the background), just the running application, which I then need to abort. Strangely enough, this "freezing/halting" does NOT happen when transmitting, correspondingly, even with high transmit sample rates such as 25 MSPS (or now possible even with 50MSPS with 8 bit/samples!). Then it works just fine - even without underruns (when using just a file source). / Rickard _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
