Hello, I'm testing an iMX6q Sabrelite board from Element14 with Xenomai 2.6.3.
First of all I tried kernel 3.0.43 from Xenomai git branch ipipe-3.0-imx6q. This kernel works well, a 15 hours running latency test (with manually generated system load like dd, netcat, ssh) shows an average latency of 5.690us and a worst case latency of 42.186us. Then I tried 3.4.6 vanilla kernel, but in this case latency test average result for is a bit worse, with a value around 18us. Worst case is about the same (<50us). I read in mailing list that L2 write allocate is disabled in 3.0.43 kernel (in facts log says: l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02870000, Cache size: 1048576 B). This feature is enabled in 3.4.6 kernel ( log says: l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02070000, Cache size: 1048576 B). Could this be the cause of latency degradation observed in 3.4.6 kernel? I also tried 3.8.13 with same results. Kernel configurations are the default ones for each kernel, with hw_perf disabled. Thanks in advance Mauro _______________________________________________ Xenomai mailing list Xenomai@xenomai.org http://www.xenomai.org/mailman/listinfo/xenomai
