Hey Rt folks I performed a benchmark that compares the jitter of hpet2 to hpet0. hpet0 is reserved to the kernel use ( hpet_reserve_timer(&hd, 0). and hd.hd_irq[0] = HPET_LEGACY_8254; in arch/x86/kernel/hpet.c). I removed these two lines. The bellow is a histogram compares the default hpet2 to hpet0 in atom D525. The test performed is a simple udp sender, it sends a single udp packet each 1ms interval. Time stamping were made by Beckhoff ET2000 ,so that the timestamps taken by a reliable and accurate tool. Question is whether it is possible to push a new kernel boot command line option that gives the user hpet0 ? hpet0 -50 0 -40 0 -20 2 -10 14 -5 143 -1 3992 1 95217 5 544 10 74 20 14 30 0 40 0 50 0 More 0 hpet2 Bin Frequency -50 1 -40 0 -20 0 -10 0 -5 0 -1 1 1 18 5 71 10 854 20 93098 30 237 40 1069 50 0 More 0 -- 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
