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Re: [Discuss-gnuradio] High CPU load when sending waveform from file to

From: Stefan Bruens
Subject: Re: [Discuss-gnuradio] High CPU load when sending waveform from file to USRP2
Date: Fri, 03 Apr 2009 18:14:09 +0200
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On Friday 03 April 2009 18:00:03 Jakob Meineke wrote:
> When I do not enable realtime scheduling in the script the CPU load seems
> to increase even more and the signal is never nice. The sampling rate is
> 10e8/4, where 4 is the interpolation set in siggen.py. Using an
> interpolation of 8 seems to alleviate the problem but I need the bandwidth.
> I installed the realtime kernel which did not change a thing.

so you try to read a 25MS/s signal from disk? Assuming you use complex floats, 
this is 8*25MB/s = 200MB/s. Even using complex short is 100MB/s. Most probably 
your CPU is not working, but waiting - you can use top to see whats going on 
(us: user process, sy: kernel workload, wa: waiting)

Stefan Brüns  /  Bergstraße 21  /  52062 Aachen
phone: +49 241 53809034     mobile: +49 151 50412019

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