Module: xenomai-forge Branch: next Commit: 882d09d85bc1c9ce41f7077878356fcd933ee36b URL: http://git.xenomai.org/?p=xenomai-forge.git;a=commit;h=882d09d85bc1c9ce41f7077878356fcd933ee36b
Author: Philippe Gerum <r...@xenomai.org> Date: Fri Aug 8 14:42:01 2014 +0200 doc/autotune: mention the potentially long auto-tuning delay --- doc/asciidoc/man1/autotune.adoc | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/doc/asciidoc/man1/autotune.adoc b/doc/asciidoc/man1/autotune.adoc index 4c93ae6..42d76bf 100644 --- a/doc/asciidoc/man1/autotune.adoc +++ b/doc/asciidoc/man1/autotune.adoc @@ -104,9 +104,27 @@ done for each of them in sequence. VERSIONS -------- - *autotune* appeared in Xenomai 3.0 for the _Cobalt_ real-time core. +NOTES +----- +The auto-tuning process may take some time for completing the +estimation. Although this delay may vary across hardware platforms, +running for 30 seconds is common. + +Once the gravity values are known for a particular hardware, one may +write them to +/proc/xenomai/clock/coreclck+ from some system init +script to set up the Xenomai core clock accordingly, e.g: + +------------------------------------------------------ + /* change the user gravity to 1728 ns (default) */ +# echo 1728 > /proc/xenomai/clock/coreclck + /* change the IRQ gravity to 129 ns */ +# echo 129i > /proc/xenomai/clock/coreclck + /* change the user and kernel gravities to 1728 and 907 ns resp. */ +# echo "1728u 907k" > /proc/xenomai/clock/coreclck +------------------------------------------------------ + AUTHOR ------- *autotune* was written by Philippe Gerum <r...@xenomai.org>. _______________________________________________ Xenomai-git mailing list Xenomai-git@xenomai.org http://www.xenomai.org/mailman/listinfo/xenomai-git
