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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 Dec 14, 2025 00:44:59)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
6263	99	115	85,21	cyclictest	26	-21	ksoftirqd/1	22:15:26	1
6263	99	115	85,21	cyclictest	26	-21	ksoftirqd/1	22:15:25	1
6263	99	114	78,22	cyclictest	26	-21	ksoftirqd/1	19:55:14	1
6263	99	107	76,18	cyclictest	26	-21	ksoftirqd/1	00:35:17	1
6263	99	103	42,47	cyclictest	21249	-21	users	00:20:39	1
6263	99	102	62,27	cyclictest	26	-21	ksoftirqd/1	22:30:18	1
6255	99	101	56,33	cyclictest	14	-21	ksoftirqd/0	20:50:13	0
6263	99	100	57,30	cyclictest	26	-21	ksoftirqd/1	23:20:13	1
6263	99	99	64,25	cyclictest	26	-21	ksoftirqd/1	21:35:14	1
6263	99	99	53,32	cyclictest	26	-21	ksoftirqd/1	23:25:15	1
6263	99	97	48,39	cyclictest	26	-21	ksoftirqd/1	23:40:15	1
6263	99	96	50,34	cyclictest	26	-21	ksoftirqd/1	00:10:16	1
6255	99	96	9,74	cyclictest	21214	-21	grep	00:20:37	0
6263	99	95	54,31	cyclictest	26	-21	ksoftirqd/1	20:35:14	1
6263	99	94	51,33	cyclictest	26	-21	ksoftirqd/1	22:35:14	1
6255	99	94	47,34	cyclictest	14	-21	ksoftirqd/0	23:45:16	0
6263	99	93	11,67	cyclictest	0	-21	swapper/1	20:00:12	1
6263	99	93	11,66	cyclictest	0	-21	swapper/1	20:10:13	1
6263	99	92	45,34	cyclictest	26	-21	ksoftirqd/1	22:45:13	1
6263	99	92	45,33	cyclictest	26	-21	ksoftirqd/1	23:55:17	1
6263	99	91	8,66	cyclictest	7791	-21	runrttasks	23:45:14	1
6263	99	91	43,33	cyclictest	26	-21	ksoftirqd/1	20:30:16	1
6263	99	91	12,63	cyclictest	0	-21	swapper/1	21:40:24	1
6263	99	91	11,67	cyclictest	0	-21	swapper/1	22:50:13	1
6263	99	90	44,32	cyclictest	26	-21	ksoftirqd/1	19:35:17	1
6263	99	90	39,34	cyclictest	26	-21	ksoftirqd/1	19:30:15	1
6263	99	90	11,60	cyclictest	0	-21	swapper/1	23:50:14	1
6263	99	89	7,62	cyclictest	21165	-21	taskset	19:50:15	1
6263	99	89	39,31	cyclictest	26	-21	ksoftirqd/1	21:50:14	1
6263	99	89	12,59	cyclictest	0	-21	swapper/1	21:30:12	1
6263	99	89	11,62	cyclictest	0	-21	swapper/1	23:00:15	1
6263	99	88	8,62	cyclictest	16924	-21	diskmemload	21:10:26	1
6263	99	88	38,32	cyclictest	26	-21	ksoftirqd/1	00:05:16	1
6255	99	88	31,48	cyclictest	14	-21	ksoftirqd/0	22:10:11	0
6263	99	87	41,29	cyclictest	26	-21	ksoftirqd/1	23:05:15	1
6263	99	86	35,34	cyclictest	26	-21	ksoftirqd/1	20:40:12	1
6263	99	86	12,62	cyclictest	0	-21	swapper/1	22:55:14	1
6263	99	86	11,62	cyclictest	0	-21	swapper/1	20:55:12	1
6263	99	85	9,54	cyclictest	0	-21	swapper/1	21:20:14	1
6263	99	85	6,58	cyclictest	0	-21	swapper/1	20:15:14	1
6263	99	85	5,60	cyclictest	0	-21	swapper/1	19:15:19	1
6263	99	85	26,36	cyclictest	11671	-21	latency_hist	20:55:01	1
6263	99	84	14,53	cyclictest	0	-21	swapper/1	22:40:18	1
6263	99	83	39,34	cyclictest	0	-21	swapper/1	21:45:13	1
6263	99	83	31,33	cyclictest	0	-21	swapper/1	23:30:14	1
6255	99	83	21,43	cyclictest	14	-21	ksoftirqd/0	21:05:14	0
6263	99	82	8,59	cyclictest	0	-21	swapper/1	23:15:11	1
6263	99	82	7,54	cyclictest	0	-21	swapper/1	19:25:14	1
6263	99	82	41,32	cyclictest	0	-21	swapper/1	20:45:15	1
6263	99	82	16,45	cyclictest	26	-21	ksoftirqd/1	19:20:13	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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