Re: [Xenomai] Heads up: I-pipe patch status on ARM

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

On 07/28/2012 10:27 PM, Paul wrote:

> 
> Thanks for the timely update Gilles - Just finished work on an 
> (unsupported) ARM1176 SoC running at 700MHz and the documents came in 
> handy. Only a rough draft at the moment and some of the kernel options 
> need tuning, but as a starting point, it looks quite reasonable.
> 
> Running a 3.2.21 kernel and Xenomai-2.6.1, graphed the latency test over 
> a 60 minute run. 


It does not look that bad. However, "dohell 3600" does not do much. If
you want to improve the latencies, use "-p 100" instead of "-p 1000" ;-)

How do you get the fancy grid with gnuplot? We could add the option to
scripts/histo.gp. Note that I prefer to draw graphs with a log scale, I
find they are more meanningful, otherwise, you do not really see how the
graph ends.


> Look forward to testing a 3.4 series kernel to see if

> the results can be improved upon.


I am running some tests on omap3 and omap4, so far with not much
success. My next try will be to simply disable CONFIG_MULTI_IRQ_HANDLER
and the irq domains, to see if I can get the same latencies as 3.2

> 
> Regards, Paul.
> 
> 
> 
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-- 
                                                                Gilles.