OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #0, slot #2

Click here to display the system's profile data or here to proceed to next system.

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 rack0slot2.osadl.org (updated Thu Nov 27, 2025 00:43:32)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
807	2	94	0,1	sleep6	0	-21	swapper/6	06:33:25	6
3826531	99	59	54,4	cyclictest	4113823	-21	latency_hist	05:53:13	7
3826518	99	56	54,2	cyclictest	3961108	-21	kworker/u16:2+flush-8:0	04:28:13	5
3825921	2	55	20,30	sleep7	0	-21	swapper/7	03:18:56	7
3825921	2	55	20,30	sleep7	0	-21	swapper/7	03:18:56	7
3826531	99	50	44,5	cyclictest	3931111	-21	latency_hist	04:13:14	7
3826527	99	50	48,2	cyclictest	3961108	-21	kworker/u16:2+events_unbound	04:33:37	6
3826531	99	49	43,5	cyclictest	232255	-21	latency_hist	08:28:13	7
3826527	99	48	46,2	cyclictest	4133695	-21	kworker/u16:2+flush-8:0	06:18:39	6
3825937	2	47	37,7	sleep4	0	-21	swapper/4	03:19:09	4
3825937	2	47	37,7	sleep4	0	-21	swapper/4	03:19:09	4
3826527	99	46	43,2	cyclictest	3992715	-21	kworker/u16:4+flush-8:0	06:43:12	6
3826531	99	45	39,5	cyclictest	589235	-21	systemd-journal	03:43:13	7
3826193	2	45	35,7	sleep5	0	-21	swapper/5	03:22:39	5
3826193	2	45	35,7	sleep5	0	-21	swapper/5	03:22:39	5
3826518	99	43	41,2	cyclictest	4093455	-21	kworker/u16:1+flush-8:0	07:28:12	5
3826517	99	41	38,2	cyclictest	4093455	-21	kworker/u16:1+flush-8:0	07:33:29	4
3826518	99	39	37,2	cyclictest	3992715	-21	kworker/u16:4+flush-8:0	05:53:34	5
3826517	99	39	37,2	cyclictest	41456	-21	kworker/u16:2+events_unbound	08:35:45	4
3826531	99	38	37,0	cyclictest	0	-21	swapper/7	05:30:33	7
3826527	99	38	36,2	cyclictest	3992715	-21	kworker/u16:4+events_unbound	06:28:42	6
3826527	99	38	36,2	cyclictest	3836267	-21	kworker/u16:1+flush-8:0	03:58:37	6
3826527	99	38	36,2	cyclictest	162030	-21	kworker/u16:1+flush-8:0	08:08:42	6
3825948	2	38	28,7	sleep6	0	-21	swapper/6	03:19:19	6
3825948	2	38	28,7	sleep6	0	-21	swapper/6	03:19:19	6
4102156	2	37	0,1	chrt	4102157	-21	tr	05:43:34	7
3826517	99	37	35,2	cyclictest	4014935	-21	kworker/u16:3+flush-8:0	05:28:33	4
3826517	99	37	34,2	cyclictest	3836267	-21	kworker/u16:1+flush-8:0	03:58:42	4
3826531	99	36	35,0	cyclictest	0	-21	swapper/7	05:16:13	7
3826531	99	36	35,0	cyclictest	0	-21	swapper/7	03:53:16	7
3826527	99	36	34,2	cyclictest	3872027	-21	kworker/u16:0+flush-8:0	03:46:37	6
3826517	99	36	34,2	cyclictest	4002891	-21	kworker/u16:0+events_unbound	04:59:52	4
3826527	99	35	33,2	cyclictest	151694	-21	kworker/u16:4+events_unbound	07:59:24	6
3826517	99	35	33,2	cyclictest	3941324	-21	kworker/u16:5+events_unbound	04:29:46	4
3826531	99	34	33,0	cyclictest	0	-21	swapper/7	06:26:36	7
3826531	99	34	33,0	cyclictest	0	-21	swapper/7	04:27:24	7
3826527	99	34	32,2	cyclictest	41456	-21	kworker/u16:2+events_unbound	08:17:43	6
3826527	99	34	32,2	cyclictest	4093455	-21	kworker/u16:1+events_unbound	05:49:34	6
3826527	99	34	32,2	cyclictest	3992715	-21	kworker/u16:4+flush-8:0	05:14:34	6
3826531	99	33	32,0	cyclictest	0	-21	swapper/7	07:33:42	7
3826531	99	33	32,0	cyclictest	0	-21	swapper/7	06:36:48	7
3826527	99	33	31,2	cyclictest	4072647	-21	kworker/u16:0+flush-8:0	05:32:13	6
3826527	99	33	31,2	cyclictest	3750195	-21	kworker/u16:2+events_unbound	03:24:34	6
3826527	99	33	30,2	cyclictest	4072647	-21	kworker/u16:0+flush-8:0	06:08:16	6
3826518	99	33	31,2	cyclictest	60181	-21	kworker/u16:4+events_unbound	07:00:13	5
3826517	99	33	31,2	cyclictest	232435	-21	kworker/u16:1+events_unbound	08:51:43	4
3826517	99	33	31,2	cyclictest	232435	-21	kworker/u16:1+events_unbound	08:42:45	4
3826531	99	32	31,0	cyclictest	0	-21	swapper/7	08:08:12	7
3826531	99	32	31,0	cyclictest	0	-21	swapper/7	06:22:24	7
3826527	99	32	30,2	cyclictest	4093455	-21	kworker/u16:1+flush-8:0	05:47:24	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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