Re: [Xenomai-help] Large (negative) latency test results and fast PC clock

[Jan Kiszka <jan.kiszka@domain.hid>]

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vikesh rambaran wrote:
> hi there
> 
> I built and installed Xenomai 2.40 with kernel 2.6.23.12 on an AMD Athlon 64
> X 2 dual core PC.
> The linux distribution used is Ubuntu 7.10, 32 bit version
> 
> When running the latency test, there are large negative and positive
> latencies reported.
> Sometimes the PC hangs while the latency test is running
> The PC time updates at almost twice the normal speed (ie almost 2 seconds
> for every one second that elapses)
> 
> Was not able to solve it using the xenomai TROUBLESHOOTING guide
> 
> The kernel config file and xeno-test output are attached.
> 
> Any help would be appreciated

You should have seen this message while configuring Xenomai:

"NOTE: Xenomai needs either X86_LOCAL_APIC enabled or HPET_TIMER disabled."

Please check if this message is visible (if not, we would like to know).
Then adopt your .config appropriately. Hint: Choose a processor type
that is reflecting your real hardware more precisely. CONFIG_M586 means
that there is no TSC, which is not true and quite suboptimal.

Jan


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