On 29/06/17 20:02, Kirspel, Kevin wrote:
For those who run a RTEMS 4.12 single processor application with LIBBSD, what percentage of time does your application spend in the timer server task? My NXP LPC3250 application spends about 13% of the processor time processing the timer server. Most of that time is spent processing LIBBSD’s kernel callouts. I am wondering if there is an advantage to only call the FreeBSD’s callout_process() function when we know a callout needs to be processed. This would reduce the number of RTEMS timer fires (which currently fire every tick).
I observed a similar problem a 96MHz LPC4088. The main issue is that callout_process() loads a lot of data (64-bit integers). So, on slow memory target, you have a performance issue with 1000 ticks per second.
-- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
