Iratxo, please do not top post. On Sun, 14 Jun 2009, Iratxo Pichel Ortiz wrote: > > I am using 2.6.30-rt16 RT Kernel on a IXP425 system. The system is running 2.6.29-rt16, right ? > > an experimental comm stack that has been working quite well with 2.6.26-rt2 > > for a very long time (> 100days). > > > > When the system boots, every 180s aprox, I see this traces in the dmesg: > > 42949422.930000] NOHZ: local_softirq_pending 02 Hmm, so something is marking the timer softirq pending, but does not wake the timer softirq. > > [42949422.940000] NOHZ: local_softirq_pending 02 > > [42949422.950000] NOHZ: local_softirq_pending 02 > > [42949422.960000] ISR HIHG LATENCY 30073 > > [42949596.920000] NOHZ: local_softirq_pending 02 > > [42949596.930000] NOHZ: local_softirq_pending 02 > > [42949596.940000] NOHZ: local_softirq_pending 02 > > [42949596.950000] NOHZ: local_softirq_pending 02 So this repeats itself roughly every 3min and stays that way for a couple of jiffies. Does your code fiddle with timers ? > > [42949596.960000] ISR HIHG LATENCY 40066 The latency is exaclty the number of NOHZ messages * 10ms. I assume you have HZ=100. Looks like your code is waiting for a timer, which does not fire due to the local_softirq_pending 02 problem. Does it work when you disable CONFIG_NOHZ ? Thanks, tglx -- 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
