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Date: Mon, 14 May 2007 13:20:27 +0200
From: "Karl Reichert" <Karl-Trampe@domain.hid>
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Subject: Re: [Xenomai-help] high latency with Intel Core 2 Duo
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> > Jan Kiszka wrote:
> > > Karl Reichert wrote:
> > > 
> > >>Hello,
> > >>
> > >> I'm using an Intel Core 2 Duo at work and an AMD XP3000+ at home. I
> > installed Xenomai 2.3.1 with nearly same configuration at both and run
> the
> > xeno-test. I get 10 times higher latency with Core 2 Duo. How is it
> possible?
> > May the SMP be the reason?
> > > 
> > > 
> > > SMP surely increases latencies (more synchronisation overhead), but
> the
> > > tests you ran were also far to short for a thorough comparison. 2 us
> > > worst-case is far too good, even on high end. Also 20 us on loaded SMP
> > > boxes may not hold. Leave the test running for a longer period ("-T"
> > > parameter, I think).
> Will do that and report the results later.
> 
> > 
> > You should configure the user-space libraries with the --enable-smp
> > option when configuring for SMP.
> > 
> I did that, but nothing changes, still the same latencys (see attached
> file).
> 
> > Also, did you compile a 32 bits or 64 bits kernel for the core 2 duo ?
> > 
> It's a 32 bit one.
> > If you think that you observe high latencies, check the TROUBLESHOOTING
> > file.
> > 
> > -- 
> >                                                  Gilles Chanteperdrix
> Karl
> -- 
> von Karl Reichert
> 
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Is there any possibility to tell Xenomai to use one core for (NonRT-)Linux and one for RTApps?
-- 
von Karl Reichert

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