Hello All,
I can't figure out (or haven't figured out) how to get actual high-resolution
timers on the above platform. I'm kind of stuck with 2.6.19, unfortunately.
I've applied the -rt patch to stock 2.6.19, merged in some random patches to
support my hardware, and gotten it to boot. But, here's what confuses me: I
have the hrtimer API, but my actual clock resolution is still shown as 10ms.
root@patty:/# cat /proc/timer_list
Timer List Version: v0.1
HRTIMER_MAX_CLOCK_BASES: 2
now at 2766685920305 nsecs
cpu: 0
clock 0:
.index: 0
.resolution: 10000000 nsecs
.get_time: ktime_get_real
active timers:
clock 1:
.index: 1
.resolution: 10000000 nsecs
.get_time: ktime_get
active timers:
#0: <c4615ec8>, hrtimer_wakeup
# expires at 2766802147358 nsecs [in 116227053 nsecs]
#1: <c4615ec8>, it_real_fn
# expires at 2767494816966 nsecs [in 808896661 nsecs]
#2: <c4615ec8>, it_real_fn
# expires at 3642163204498 nsecs [in 875477284193 nsecs]
#3: <c4615ec8>, it_real_fn
# expires at 3643403169278 nsecs [in 876717248973 nsecs]
Additionally, I don't see CONFIG_HIGH_RES_TIMERS anywhere in my kernel
menuconfig. I've added a patch from Kevin Hilman and Milan Svoboda
(http://lkml.indiana.edu/hypermail/linux/kernel/0607.1/2343.html) which
purports to enable a high-resolution clock event source for this board, but
that doesn't seem to change anything.
I think I don't properly understand the preempt_rt / hrtimers /
board-specific-bits ecosystem here. What are the bits and pieces I need in
order to have high-resolution timers on this platform?
Many, many thanks,
Eric Anderson
--
Eric W. Anderson University of Colorado
eric.anderson@xxxxxxxxxxxx Dept. of Computer Science
phone: +1-720-984-8864 Systems Research Lab - ECCR 1B54
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