Gilles,
On 05/22/2012 04:07 AM, Gilles Chanteperdrix wrote:
On 05/22/2012 02:31 AM, Mitchell Tasman wrote:
Hi. I'm running an OMAP DM3725-based board with a 2.6.38.8 kernel, a
mid-May 2012 git snapshot of xenomai-2.6, and a backport (really just
application) of the patch that Gilles referenced in the "IRQ latency"
thread last week:
http://git.xenomai.org/?p=ipipe-gch.git;a=commit;h=81bfc05c4716b76e79f5e486baf4c52015a3b92c
Please try the following patch instead:
Thank you very much for your prompt and most helpful response.
I have applied the patch that you supplied, and find a dramatic
reduction in the maximum latency experienced in servicing edge-triggered
GPIO interrupts. In testing so far today with the new patch, I have not
encountered a single instance of the sort of extreme latency that
prompted my query to the mailing list.
Might you consider applying the new patch to I-Pipe for ARM 2.6.38.8,
and publishing a new revision of that patch set? This could be of
significant benefit to those members of the Xenomai community that are
presently using a 2.6.38.8 kernel on ARM platforms.
You might also consider addressing/replacing the original "ipipe/arm:
defer chained interrupts handling" patch that was applied to I-Pipe for
ARM 3.0.13, if the new patch is relevant to that kernel as well.
Thanks again and Best Regards,
Mitch
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