Linux Low-Latency Tracing for Multicore Hard Real-Time Systems

Table 3

Statistics per loop, in nanoseconds, generated by npt on both standard and PREEMPT_RT patched kernels for both writer and timer versions of LTTng-UST.

Kernel	Latencies in ns
	Standard		PREEMPT_RT patched
LTTng-UST 2.2	Writer	Timer	Writer	Timer
Minimum	270.0	369.4	262.5	258.0
Mean	498.2	424.2	497.6	286.8
Maximum	82 180	7569	35 260	6409
Variance	3.620	1.063	4.872	0.4541
std deviation	60.17	32.60	69.80	21.31