We're moving an application that we had running on pc hardware with the
Ettus B210, to the embedded arm E310.  On the pc side we were at 80% idle
cpu when running (intel i5-4570).  With armv7 we're down to 30% idle, with
one of the cores @100% so it's not keeping up.
Are there any arm specific optimizations that are recommended or gotchas.
We are using the release4 version of the SDK and firmware.

We'd also like to use the complex_to_mag_approx RFNOC block.  Is there any
sample code around to look at.

Thanks,
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