Hi all,
i am having a problem concerning the clock drift under load:
# /usr/xenomai/bin/clocktest
== Tested clock: 0 (CLOCK_REALTIME)
CPU ToD offset [us] ToD drift [us/s] warps max delta [us]
--- -------------------- ---------------- ---------- --------------
0 775571614.0 166776.858 0 0.0
It remains in the hundreds of MILLIseconds, changing constantly. My
setup consists of an embedded Intel Atom board (1.6GHz Z530 processor)
with a 2.6.32.7 kernel and Xenomai 2.5.2. Latencies under load are
reasonable. Mean latency < 10us. Maximum latency < 40us.
Without load the ToD offset is approximately constant over time with a
ToD drift in the range of 10 microseconds (strangely after a while this
settles in a range of 2 microseconds). Does anyone have an idea how this
can be caused? As a workaround I currently use rt_timer_read() in all
relevant programs (also the non-realtime ones), since I need consistent
timestamps between realtime and non-realtime tasks.
One other (maybe unrelated) strange behavior is occasional secondary
mode switches when calling rt_queue_read(...).
Any help would be appreciated. Thanks in advance!
Cheers,
Jonas
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