Changes between Version 21 and Version 22 of Internal/BuildingGNURadioImage

Timestamp:

Feb 2, 2009, 10:24:04 PM (15 years ago)

Author:

ssugrim

Comment:

—

Internal/BuildingGNURadioImage

@@ -322 +322 @@
 We then added the usrp group and made the udev modifications. 
 
-
+Our first run of :
+{{{
+node1-1:~/gnuradio/gnuradio-examples/python/usrp# ./usrp_benchmark_usb.py 
+}}}
+
+failed. Jrock had noticed that the console was spitting usb events and "renumbering" the usrp. Each run of lsusb or 
+{{{
+# ls -lR /dev/bus/usb | grep usrp
+crw-rw---- 1 root usrp 189, 450 Feb  2 17:14 067 <-- note the 67 instead of 2
+}}}
+
+would get a higher number for the device id. Rebooting the usrp (I guess it was in some kind of loop where it rebooted continously) fixed the problem. 
+
+----
+
+After that we had a '''SUCCESSFUL''' run of the benchmark:
+{{{
+# ./usrp_benchmark_usb.py 
+Testing 2MB/sec... usb_throughput = 2M
+ntotal    = 1000000
+nright    = 999506
+runlength = 999506
+delta     = 494
+OK
+Testing 4MB/sec... usb_throughput = 4M
+ntotal    = 2000000
+nright    = 1997978
+runlength = 1997978
+delta     = 2022
+OK
+Testing 8MB/sec... uUuOusb_throughput = 8M
+ntotal    = 4000000
+nright    = 3822354
+runlength = 1563106
+delta     = 2436894
+FAILED
+Testing 16MB/sec... usb_throughput = 16M
+ntotal    = 8000000
+nright    = 7996578
+runlength = 7996578
+delta     = 3422
+OK
+Testing 32MB/sec... uUuOuOuOuOuOuOuOuOuOuOuOuOuOuOuOuOuOuOusb_throughput = 32M
+ntotal    = 16000000
+nright    = 14442379
+runlength = 3383
+delta     = 15996617
+FAILED
+Max USB/USRP throughput = 16MB/sec
+}}}
+
+Ibob says the last set of failures was expected as we've reached the through put limit of the usb controller.
+
+We're taking an image from this point:
+ Next we will try:
+ * transmit from one node and display the received signal on another.
+ * export the display to a local x server. 
+
+