RE: [Discuss-gnuradio] Embedded control of USRP

[Lee Patton]

Thanks for the advice, Jim. I appreciate it.  I think I found a 1.1 GHz
Pentium M (thanks to Matt) that can be cooled fanless.  We're going to
give either that board or a 1 GHz Celeron board from Kontron a try.  I
think "outrunning" is the way to go right now.

On Thu, 2006-04-20 at 13:38 -0500, Jim Hanlon wrote:
>  I tried to get the USRP talking to an 800MHz VIA fanless industrial control 
> computer, with expansion card to get USB 2.0
> performance. I found that gnuradio installed and ran OK, but USRP performance 
> consistently exhibited USB overruns and underruns, to
> the point that our evaluation of USRP capabilities was limited by our compute 
> power. 
> 
> I think its nice to be fanless, if you can. And maybe, some clever 
> engineering of USB interrupt service routines could improve i/o
> performance. But  it is much simpler these days just to outrun the problem 
> with a faster CPU clock. 
> 
> If you are trapped by form factor and "no fan" rules, you may be out of luck. 
> Does your architecture allow for (say, USB) expansion
> cards ?  If so, you could build one that did block transfers to/from the USB 
> bus and your slowish CPU.
> HTH
> Jim Hanlon
> 
> 
> > -----Original Message-----
> > From: address@hidden 
> > [mailto:address@hidden
> > g] On Behalf Of Lee Patton
> > Sent: Tuesday, April 18, 2006 5:19 PM
> > To: Eric Blossom
> > Cc: Discuss gnuradio
> > Subject: Re: [Discuss-gnuradio] Embedded control of USRP
> > 
> > On Mon, 2006-04-03 at 11:20 -0700, Eric Blossom wrote:
> > > ... unless you're a glutton for punishment, don't get the Celeron 
> > > version, spend the extra bucks and get the Pentium M.
> > 
> > Besides the dearth of on-board cache, what are the other 
> > drawbacks of a Celeron?
> > 
> > To fit the dimensional requirement I was given (5"x5"x~1"), 
> > the SBC must be passively cooled.  However, I'm not finding a 
> > Pentium-M solution that can be passively cooled and meets our 
> > availability requirements.  I have found a 600 MHz Celeron 
> > solution, but has half the L2 cache.
> > 
> > In our application, we'll be pulling full throttle from the 
> > USRP, maybe FIR filtering, and then pushing back out to USRP. 
> >  Not too heavy on the signal processing.
> > 
> > All advice appreciated.
> > 
> > - Lee
> > 
> > P.S.
> > 
> > Some potential solutions:
> > http://www.gms4sbc.com/P60x_BO.html  (can't meet availability)
> > http://www.kontron-emea.com/index.php?id=82&cat=58 (JRex-PM, 
> > can only air cool Celeron M 600 MHz)
> > 
> > 
> > 
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > 
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio