[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 |
User-agent: |
KMail/1.11.2 (Linux/2.6.27.19-3.2-default; KDE/4.2.2; x86_64; ; ) |
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
--
Stefan Brüns / Bergstraße 21 / 52062 Aachen
phone: +49 241 53809034 mobile: +49 151 50412019