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).
You should configure the user-space libraries with the --enable-smp
option when configuring for SMP.
Also, did you compile a 32 bits or 64 bits kernel for the core 2 duo ?
If you think that you observe high latencies, check the TROUBLESHOOTING
file.
--
Gilles Chanteperdrix
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