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> Date: Fri, 30 Jul 2010 10:01:41 -0700
> From: m...@ettus.com
> To: cepop...@hotmail.com
> CC: discuss-gnuradio@gnu.org
> Subject: Re: [Discuss-gnuradio] gnuradio land speed record?
>
> On 07/30/2010 09:33 AM, Clark Pope wrote:
> >
> > I'm curious what people do with the wideband capability of the
> > gnuradio/usrp and what is the widest bandwidth signal one can really
> > process with available computers?
> >
> > For reference I have a ~2.4 GHz core 2 duo laptop. For a 200 kHz FM
> > demodulator I consume about 40% of one cpu. That's pretty much the
> > simplest useful thing anyone can do so that maps to my laptop might
> > be able to process 1 MHz bandwidth continuously.
> >
> > Similarly, my hard drive can't really keep up with 32 Mbyte/s
> > recording. So if samples are 16-bit and you really can't afford lost
> > data it seems like recording is limited to maybe 10 MHz or so
> > bandwidth.
> >
> > However, with gigabit Ethernet you can send 100 Mbyte/s or more.
> > What's the most anyone has recorded or processed continuously? What
> > level of compexity was the processing?
>
>
> With RAID arrays or SSDs, it isn't that hard anymore to sustain 100 MB/s
> recording to disk. With 4 and 6 core systems and the i7 architecture
> you can get more than 5X the performance of your laptop.
>
> There are a lot of applications using the full 25 MHz of RF bandwidth.
> You just need to pay a lot of attention to efficiency of your program
> and algorithms.
>
> Matt
Good point, if you remove the CPU bottleneck and go straight to storage you can
do 100 MByte/s. Now is gigE the best for that or would SATA be better? Seems
like once you buy the networking and storage equipment you've blown your budget
relative to the usrp price.
Yeah, I'd be interested in what those 25 MHz apps are. Maybe we need a contest
for widest bandwidth, practical, most useful application on gnuradio. One
ground rule though would be that the cost of the processing device has to be
less than the USRP2, for example.
Thanks,
Clark
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