Hi,
I am using a Real-Time linux kernel 2.6.33.7 and I try to measure some
latencies on the platform ARM926 OMAPL138.
I think something is wrong with the timestamps
.
The platform timer.c file provides a timer, for time events, and one
free running clocksource.
Any ideas of what may be wrong?
/*
* clocksource
*/
static cycle_t read_cycles(struct clocksource *cs)
{
struct timer_s *t = &timers[TID_CLOCKSOURCE];
return (cycles_t)timer32_read(t);
}
static struct clocksource clocksource_davinci = {
.rating = 300,
.read = read_cycles,
.mask = CLOCKSOURCE_MASK(32),
.shift = 24,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
kmmcd-188 0dNh4. 134260000us : 188:120:R + [000] 12: 50:S
sirq-rcu/0
kmmcd-188 0...2. 134260000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0d..3. 134260000us : 4: 50:R + [000]
366:120:S TPS6507x Touchs
sirq-tim-4 0...2. 134260000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134260000us : 12: 50:S ==> [000]
366:120:R TPS6507x Touchs
TPS6507x-366 0...2. 134260000us!: 366:120:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134270000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134270000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134270000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0...2. 134270000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134270000us!: 12: 50:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134280000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134280000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134280000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0...2. 134280000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134280000us!: 12: 50:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134290000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134290000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134290000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0d..3. 134290000us : 4: 50:R + [000]
366:120:S TPS6507x Touchs
sirq-tim-4 0...2. 134290000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134290000us : 12: 50:S ==> [000]
366:120:R TPS6507x Touchs
TPS6507x-366 0...2. 134290000us!: 366:120:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134300000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134300000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134300000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0...2. 134300000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134300000us!: 12: 50:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134310000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134310000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134310000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0...2. 134310000us : 4: 50:S ==> [000] 12:
50:R sirq-rcu/0
sirq-rcu-12 0...2. 134310000us!: 12: 50:S ==> [000] 188:120:R kmmcd
kmmcd-188 0d.h4. 134320000us : 188:120:R + [000] 4:
50:S sirq-timer/0
kmmcd-188 0dNh4. 134320000us : 188:120:R + [000] 12:
50:S sirq-rcu/0
kmmcd-188 0...2. 134320000us : 188:120:R ==> [000] 4:
50:R sirq-timer/0
sirq-tim-4 0d..3. 134320000us : 4: 50:R + [000] 15:
98:S events/0
TIA
Andreas
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