On Thu, Oct 13, 2005 at 10:06:28AM -0700, Eric Blossom wrote: > > Don't use the -M option with small values. You won't get a good > answer unless you let it run for 10 - 20 seconds or so. We want to > know what it will sustain over an extended period of time. You'll > probabably want to run each test a couple of times too. [There may be > a problem where the fifo's aren't flushed between runs which is > another reason to use longer test periods. I think that may be why > usb_benchmark doesn't work as expected.]
Here run as user gr: ./test_usrp_standard_rx -D 128 xfered 1.34e+08 bytes in 67.3 seconds. 1.996e+06 bytes/sec. cpu time = 1.312 noverruns = 16 ./test_usrp_standard_rx -D 64 xfered 1.34e+08 bytes in 33.6 seconds. 3.994e+06 bytes/sec. cpu time = 1.31 noverruns = 5 ./test_usrp_standard_rx -D 32 xfered 1.34e+08 bytes in 32.8 seconds. 4.086e+06 bytes/sec. cpu time = 1.279 noverruns = 167 ./test_usrp_standard_rx -D 16 xfered 1.34e+08 bytes in 32.8 seconds. 4.088e+06 bytes/sec. cpu time = 1.21 noverruns = 83 ./test_usrp_standard_rx -D 8 xfered 1.34e+08 bytes in 32.8 seconds. 4.086e+06 bytes/sec. cpu time = 1.321 noverruns = 41 > > > Likewise, try test_usrp_standard_tx with different values of the > > > -I <interp> option. Start with -I 256, then try -I 128, 64, 32, 16. > > > > Can't, no Tx board. > > The measurement should work fine with no Tx board. ./test_usrp_standard_tx -I 256 xfered 5.37e+08 bytes in 269 seconds. 1.998e+06 bytes/sec. cpu time = 7.15 70 underruns ./test_usrp_standard_tx -I 128 xfered 5.37e+08 bytes in 140 seconds. 3.848e+06 bytes/sec. cpu time = 7.33 32768 underruns ./test_usrp_standard_tx -I 64 xfered 5.37e+08 bytes in 140 seconds. 3.848e+06 bytes/sec. cpu time = 7.19 32768 underruns ./test_usrp_standard_tx -I 32 xfered 5.37e+08 bytes in 140 seconds. 3.847e+06 bytes/sec. cpu time = 7.63 32768 underruns ./test_usrp_standard_tx -I 16 xfered 5.37e+08 bytes in 140 seconds. 3.847e+06 bytes/sec. cpu time = 6.89 32768 underruns Both of these are about the same running as root and nice -20. > If you've got a logic analyzer available and want to play, I can give > you some suggestions of things to watch. I suspect that what you'll > see are *highly* variable inter-packet arrival times. No such luck. Lotsa stuff in my toy box but not much modern test equipment. -- LRK [EMAIL PROTECTED] _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
