On Sun, Sep 30, 2007 at 09:07:19PM +0530, Jaswinder Singh wrote: > Here are my results on Intel Pentium 4 : > > Command line : ./cyclictest -t 1 -p 80 -i 10000 -l 10000 -q Can you post the output of /proc/timer_list? > 2.6.23-rc8-rt1 : > WARNING: High resolution timers not available > T: 0 ( 2003) P:80 I:10000 C: 10000 Min: 1500 Act: 6129 Avg: 4502 Max: 7832 That one should give you sane results. > From where I can get Linux-2.6.16-hrt5 and Linux-2.6.16-rt12 patches. I don't think it makes much sense to play with such an old kernel any more. > CONFIG_HIGH_RES_TIMERS=y are defined in .config then why I am getting > "WARNING: High resolution timers not available". > > Why my results are not so impressive in realtime even though I defined: > CONFIG_PREEMPT_RT=y > CONFIG_PREEMPT=y > CONFIG_PREEMPT_SOFTIRQS=y > CONFIG_PREEMPT_HARDIRQS=y > CONFIG_PREEMPT_BKL=y Doesn't look too bad. Are you sure you actually _bootet_ that kernel? :) > Min, Avg and Max are showing cyclic latencies. Ideally It should be > ZERO. Am I right ? You won't get zero. On x86 these latencies should be well below 100 us maximum time, with an average in the lower 10 us range. Robert -- Pengutronix - Linux Solutions for Science and Industry Entwicklungszentrum Nord http://www.pengutronix.de - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
