Hi We are not seeing performance monitoring interrupts on AMD eKabini CPU (family 16h processor). Tried both 3.4 and 3.15 kernels. If there is more relevant group for this, I could post it there.
When I write to 0xc001_0004 (as given in AMD spec for core perf counters) counter I see that it overflows fine and it starts counting back from 0. However I don't see any NMI after oerflow. I also checked 0xc001_0000 and its value is 0x530076, which shows that the NMI is enabled. On 3.15 kernel I see this message on console: [67044.084213] perf interrupt took too long (2529 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 [146301.023898] Uhhuh. NMI received for unknown reason 31 on CPU 1. [146301.023952] Do you have a strange power saving mode enabled? [146301.023991] Dazed and confused, but trying to continue Anyone else seeing this? Thank you. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
