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Default latency plot of system in rack #3, slot #6

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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system

Characteristics of the 50 highest latencies:

System rack3slot6.osadl.org (updated Sun Apr 26, 2026 00:45:00)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
26030	99	112	79,21	cyclictest	26	-21	ksoftirqd/1	22:20:13	1
24819	2	110	6,89	sleep1	24265	-21	/usr/sbin/munin	19:05:23	1
26030	99	109	80,19	cyclictest	26	-21	ksoftirqd/1	21:50:13	1
26030	99	109	79,19	cyclictest	26	-21	ksoftirqd/1	19:30:15	1
26030	99	101	70,20	cyclictest	26	-21	ksoftirqd/1	00:00:14	1
26030	99	100	65,22	cyclictest	26	-21	ksoftirqd/1	23:30:16	1
26030	99	99	69,20	cyclictest	26	-21	ksoftirqd/1	20:25:24	1
26030	99	99	66,22	cyclictest	26	-21	ksoftirqd/1	22:40:16	1
26030	99	99	66,21	cyclictest	26	-21	ksoftirqd/1	21:10:16	1
26030	99	99	66,20	cyclictest	26	-21	ksoftirqd/1	21:45:14	1
26030	99	99	65,21	cyclictest	26	-21	ksoftirqd/1	21:00:23	1
26030	99	99	65,21	cyclictest	26	-21	ksoftirqd/1	21:00:23	1
12289	2	99	0,6	chrt	12293	-21	wc	20:00:29	0
26030	99	97	66,20	cyclictest	26	-21	ksoftirqd/1	22:10:13	1
26030	99	96	61,21	cyclictest	26	-21	ksoftirqd/1	23:10:13	1
26024	99	96	19,30	cyclictest	14	-21	ksoftirqd/0	21:00:25	0
26024	99	96	19,30	cyclictest	14	-21	ksoftirqd/0	21:00:25	0
26030	99	93	59,22	cyclictest	26	-21	ksoftirqd/1	21:40:14	1
26030	99	93	59,21	cyclictest	26	-21	ksoftirqd/1	21:05:15	1
26030	99	93	59,21	cyclictest	26	-21	ksoftirqd/1	19:35:15	1
25610	2	93	24,24	sleep0	0	-21	swapper/0	19:07:40	0
26030	99	91	56,22	cyclictest	26	-21	ksoftirqd/1	22:30:14	1
26030	99	89	54,24	cyclictest	26	-21	ksoftirqd/1	21:30:16	1
26030	99	89	54,22	cyclictest	26	-21	ksoftirqd/1	20:05:13	1
26030	99	89	52,24	cyclictest	26	-21	ksoftirqd/1	00:30:14	1
26030	99	88	55,22	cyclictest	26	-21	ksoftirqd/1	23:15:13	1
26030	99	87	51,24	cyclictest	26	-21	ksoftirqd/1	23:25:25	1
26024	99	87	11,59	cyclictest	0	-21	swapper/0	23:10:11	0
26030	99	85	53,20	cyclictest	26	-21	ksoftirqd/1	21:20:25	1
26030	99	85	50,23	cyclictest	26	-21	ksoftirqd/1	23:00:15	1
26030	99	85	50,22	cyclictest	26	-21	ksoftirqd/1	22:55:15	1
26030	99	85	49,23	cyclictest	26	-21	ksoftirqd/1	20:50:12	1
26030	99	85	46,27	cyclictest	26	-21	ksoftirqd/1	20:30:13	1
26030	99	84	49,23	cyclictest	26	-21	ksoftirqd/1	20:45:14	1
26030	99	83	48,23	cyclictest	26	-21	ksoftirqd/1	00:10:16	1
26030	99	83	46,25	cyclictest	26	-21	ksoftirqd/1	21:15:15	1
26030	99	83	45,26	cyclictest	26	-21	ksoftirqd/1	00:20:14	1
26030	99	83	10,60	cyclictest	36	-21	kcompactd0	21:25:12	1
26030	99	82	43,27	cyclictest	26	-21	ksoftirqd/1	20:55:13	1
26024	99	81	17,45	cyclictest	0	-21	swapper/0	20:45:13	0
26030	99	80	30,38	cyclictest	26	-21	ksoftirqd/1	23:35:14	1
26030	99	80	11,55	cyclictest	0	-21	swapper/1	19:40:13	1
26030	99	79	41,26	cyclictest	26	-21	ksoftirqd/1	22:00:14	1
26030	99	79	13,53	cyclictest	0	-21	swapper/1	19:20:13	1
26030	99	79	10,56	cyclictest	562	-21	runrttasks	19:55:14	1
26030	99	79	10,56	cyclictest	562	-21	runrttasks	19:55:14	1
26030	99	78	39,28	cyclictest	26	-21	ksoftirqd/1	00:25:13	1
26030	99	77	17,24	cyclictest	15	1	rcu_preempt	23:55:12	1
26030	99	77	13,50	cyclictest	0	-21	swapper/1	23:40:12	1
26024	99	74	36,22	cyclictest	14	-21	ksoftirqd/0	19:15:16	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2019-05-28 - 00:17