Philippe Gerum wrote: > On Thu, 2007-02-01 at 18:39 +0100, Jan Kiszka wrote: > >> Hi, >> >> just to save my current finding and maybe trigger some feedback: >> >> We just tried both 2.3.x-SVN and trunk with our "reference robot". While >> 2.3.x behaves fine, weird things happened with trunk /wrt some serial >> device. We saw reception timeouts and no serial IRQs. >> >> So I fired up a second box with plain latency test (all the latest: SVN, >> 2.6.19.2, ipipe-i386-1.6-06): >> >> >>> [EMAIL PROTECTED] :/root# latency >>> == Sampling period: 100 us >>> == Test mode: periodic user-mode task >>> == All results in microseconds >>> warming up... >>> RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99) >>> RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat >>> worst >>> RTD| 1299105.405| 1505168.638| -14316.105| 3671| 1299105.405| >>> -14316.105 >>> > > I can't reproduce this here, so this is likely an untested configuration > issue again. > > .config welcome. TIA, > > What about a patch? =8)
--- include/nucleus/timebase.h (revision 2094)
+++ include/nucleus/timebase.h (working copy)
@@ -183,7 +183,7 @@ static inline xnticks_t xntbase_get_jiff
static inline xnticks_t xntbase_get_rawclock(xntbase_t *base)
{
- return xntbase_get_jiffies(base);
+ return xntbase_periodic_p(base) ? base->jiffies : xnarch_get_cpu_tsc();
}
int xntbase_alloc(const char *name,
This fixes at least one symptom I found, the broken latency test, but we still
need
to re-check the serial device scenario on the robot. That will take longer
unfortunately.
Jan
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