Re: [Discuss-gnuradio] Large RX Delay

[Thomas Schmid]

Hi Eric,

I did new test today, and you were right. I had a lot of underrun.
Therefore, I increase fusb_nbloccks to 8 and fusb_block_size to 2048.
Even with this setting, I got some underruns, but they were not often
at all. Here are the new numbers (for the code in trunk):
Decimation, Nice, Real_Time, mean [s]
8, 10, no, 0.00058
8, -20, no, 0.00057
8, -20, yes, 0.00058
16, 10, no, 0.00108
16, -20, no, 0.00102
16, -20, yes, 0.00106

Interpret this as a CSV file ;). Nice is the nice value with which the
process run. Real_time means if real time scheduling was enabled or
not. As you can see, these numbers are way better then the ones I had
yesterday.

Now, here the result for your updated code:
Decimation, Nice, Real_Time, mean [s]
8, 10, no, 0.000635
8, -20, no, 0.000629
8, -20, yes, 0.000627

As you can see, the new code performs worse. I didn't do more than
these three tests with your code, because I wanted to see a first
result, before I spend more time collecting data.

Thomas