Re: [Xenomai-help] large latencies on a Dell D620 dual core laptop

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Daniel Simon wrote:
> On Tue, 03 Apr 2007 18:16:24 +0200
> Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> wrote:
> 
> 
>>Maybe there is a way to disable legacy power management at BIOS level ?
> 
> 
> there was a remaining potential source of PM interrupts in the bios (from the
> serial ata), which is now disabled. I did testing with various configurations:
> 
> -in runlevel 1 the tests in /usr/xenomai/bin are generally succesfully
> performed, with max latencies in the range of 5-10 us (output of xeno-test
> attached)
> 
> -in runlevel 3 the laptop freezes after a while, e.g. when rmmoding xeno_native
> after a succesful latency test, or when modprobing xeno_posix

What is the difference between runlevel 1 and runlevel 3 ?

> 
> -under X control is mostly lost immediatly after modprobing xeno_native...  may
> be I am too greedy?

Usually, X should only induce high latencies. You can avoid such
latencies by adding the "NoAccel" option to /etc/X11/XF86Config-4, maybe
you can try the NoAccel trick to solve your issues as well ?

-- 
                                                 Gilles Chanteperdrix