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[Discuss-gnuradio] Cannot Achieve 50MSPS Sampling Rate

From: labarowski
Subject: [Discuss-gnuradio] Cannot Achieve 50MSPS Sampling Rate
Date: Mon, 5 Mar 2012 08:10:19 -0800 (PST)

I'm using an Ettus N210. I have a simple block diagram in GRC with a cosine
signal source feeding a throttle feeding the usrp sink. All share the
samp_rate variable as their sampling rate, which I am trying to get to 50M.
So far, I've been able to achieve up to 25MSPS using Complex int16 as the
wire format with minimal under sampling (A few 'U's are printed to the
terminal at first, but it eventually stabilizes and stops printing Us). I've
been able to get 33.333333MSPS with minimal undersampling using complex
int8. I'm yet to achieve 50MSPS. I have an older computer that was unable to
achieve these sample rates, so I thought it might be my pc. However, this
laptop has a Core i5 M450 @2.4GHz, 4Gb DDR3 and a gigabit Ethernet card
(integrated though). I'm not sure how much power gnuradio requires, but I
feel like this is a fair amount for most applications. I've set sudo sysctl
-w net.core.rmem_max=50000000 and sudo sysctl -w net.core.rmem_max=50000000.
Not sure what else I can do. I thought maybe I could change the decimation
rate, but that's not going to help if I can't change the format over the
wire. Any help is appreciated!
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