Daniel Simon wrote:
> Hello all,
>
> I have very high latencies running Xenomai on my new laptop.
> It is a dell D620 dual core laptop with the following
> configuration:
>
> kernel 2.6.20.3, xenomai 2.3.1, adeos-ipipe-2.6.20-i386-1.7-03.patch
> compiled with gcc-4.1.1 (fedora core 6), cpuinfo is attached
>
> kernel config file are attached, to summarize:
>
> no HPET, no APM, no CPU_FREQ, no ACPI_PROC
> CONFIG_XENO_HW_SMI_APMC must be enabled, otherwise the kernel does not boot
>
> here is a sample of the latency test trace:
>
> [EMAIL PROTECTED]:bin$ ./latency -f
> == Sampling period: 100 us
> == Test mode: periodic user-mode task
> == All results in microseconds
> warming up...
> RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99)
> RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat worst
> RTD| 5.463| 5.823| 112.608| 1| 5.463| 112.608
> RTD| 5.484| 6.109| 1414.435| 32| 5.463| 1414.435
> RTD| 5.388| 6.025| 344.315| 37| 5.388| 1414.435
> RTD| 5.432| 6.149| 1549.593| 69| 5.388| 1549.593
> RTD| 5.468| 5.769| 32.653| 69| 5.388| 1549.593
> RTD| 5.447| 6.183| 1671.993| 109| 5.388| 1671.993
> RTD| 5.506| 6.135| 2935.370| 139| 5.388| 2935.370
> RTD| 5.406| 6.753| 1505.142| 200| 5.388| 2935.370
> RTD| 5.456| 5.827| 36.626| 200| 5.388| 2935.370
> RTD| 5.041| 6.138| 1393.665| 229| 5.041| 2935.370
> RTD| 5.503| 5.778| 52.663| 229| 5.041| 2935.370
> RTD| 5.506| 6.138| 1691.224| 263| 5.041| 2935.370
>
> I also disabled the USB emulation in BIOS, also boot in runlevel 3
> (without X), but that does not improve this bad behavior.
>
> Any idea? Is it possible to be a rt_pathological laptop?
Maybe you could compile Xenomai support as modules, and disable
CONFIG_XENO_HW_SMI_APMC ? If this does not work, I am afraid you are in
the "out of luck" case of Xenomai TROUBLESHOOTING file.
--
Gilles Chanteperdrix
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