Re: [Openbts-discuss] Running OpenBTS on Atom Z530

[Harvind S. <hs...@ke...>]

Must have been a typo...but we ran OpenBTS with a 52Mhz clock at Burning
Man.   We used Ubuntu 9.04.

The CPU usage should be around (20+9*N)% when N calls are in progress,
running at 1.6GHz with the log levels at INFO or lower.   You might want
to make sure that frequency scaling isn't screwing up the Atom.

You should see the "IND CLOCK" message once a second.  

--- Harvind

On Wed, 2009-10-28 at 19:37 -0400, David A. Burgess wrote:
> Eli -
> 
> 
> Going over to a 52 MHz clock will make a big difference, because it
> allows you to remove the polyphase resampler.
> 
> 
> We *did* run OpenBTS on 1.6 GHz Atom mini-ITX's at Burning Man, but it
> was with the 64 MHz clock.  It was a tight fit, but it worked.
> 
> 
> As for the "IND CLOCK" messages, they are normal in more recent
> releases.
> 
> 
> -- David
> 
> On Oct 28, 2009, at 7:34 PM, Eli Gurvitz wrote:
> 
> > Hi,
> >  
> > I am trying to run OpenBTS on an Atom Z530 (1.6 GHz), with Ubuntu
> > and kernel version 2.6.24 and it is working very poorly. I'm
> > comparing it to my other platform - an old Pentium 3, 800 MHz on
> > which it works much better - I mean that on the P3 several phones
> > connect with both local and foreign SIM cards.
> >  
> > On my Atom, the Transceiver runs at 63% CPU. Only one handset (a
> > Nokia 7650) connects and only when I put in a local SIM and
> > broadcast on the real frequency of the local provider. I am using
> > RTPRIO as Alexander suggested but it doesn't seem to help.
> >  
> > I'm also getting the CLOCK Indication message from the Transceiver
> > every second. I understand that this means that OpenBTS fails to
> > transmit on time.
> >  
> > Is there a way to improve the performance on the Atom? Will an
> > external clock help in this situation?
> >  
> > Thanks,
> > Eli
> >  
> >  
> >  
> > 
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> 
> 
> David A. Burgess
> Kestrel Signal Processing, Inc.
> 
> 
> 
> 
> 
> 
> 
> 
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