Clark, >> On two different desktop PC (both Core 2 Duo) and on a notebook >> (Core Duo) the kernel (2.6.24.7-rt26, CONFIG_X86_32) locks up hard >> under a certain rt load. The failure can be reproduced reliably >> with the following command: >> sudo ./cyclictest -p99 -t10 -n -i250 > My guess would be that since you're running 10 threads on two > processors at the highest available priority, you're starving all the > hard IRQ threads (as well as soft irq and other kernel threads). > This is one of those power-tool moments where you can lock up the > system with the wrong workload/priority combination. Hmm, I would agree immediately, if the tasks were using all of the CPU power. But this is not the case. In the present case, running # cyclictest -p99 -t10 -n -i250 results in about 10% CPU load. So there is plenty of time in between to let the system respond. I can reproduce the problem here (2.6.24-rt, 2.6.26-rt, various configurations). The system does not crash every time when cyclictest is started, only once in about 5 trials or so. If it crashes, then it does so immediately after being started. Whenever cyclictest survives for several seconds, then it never crashes at a later time. I tend to believe that we have a bug here, not a regular behavior. Carsten. -- 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
