On 10/19/2017 10:25 AM, Kai-Uwe Storek via USRP-users wrote:
I just constructed the attached flow-graph, and ran it on my ancient Dell Latitude laptop:Hey,after experiencing some problems (time outs, etc) with the current UHD develop version (master branch) I changed the UHD version to 3.10.2 (maint branch, #122bfae). To do so, I just used the prefix recipe gnuradio-stable via pybombs. Now I'm not able to transmit even low bandwidth signals. My setup is - X300 via 1G ethernet - gnuradio (maint branch) - Debian with kernel 4.9. I used a simple flow graph with just a sine source directly connected to the USRP sink block. Even for sample rates below 2MSamples/s one of the cpu core of my Xeon E5-2630 v2 is 100% busy. Observing the cpu load with htop, I recognized that most of the cpu load is red which indicates kernel space activities... After several seconds I finally got many "U"s in the console window. Some ideas how to isolate the problem? Thanks in advance! Kai _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[mleech@lab ~]$ ./x300_test.pylinux; GNU C++ version 4.8.3 20140911 (Red Hat 4.8.3-7); Boost_105400; UHD_003.010.002.000-3-g122bfae1
-- X300 initialization sequence... -- Determining maximum frame size... 4320 bytes. -- Setup basic communication... -- Loading values from EEPROM... -- Setup RF frontend clocking... -- Radio 1x clock:200-- Detecting internal GPSDO.... Found an internal GPSDO: LC_XO, Firmware Rev 0.929a
-- [DMA FIFO] Running BIST for FIFO 0... pass (Throughput: 1290.6MB/s) -- [DMA FIFO] Running BIST for FIFO 1... pass (Throughput: 1309.7MB/s) -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- Performing timer loopback test... pass -- Performing timer loopback test... pass No underruns at all, and CPU was quite modest. Are you running within a VM?
x300_test.grc
Description: application/gnuradio-grc
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