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 Apr 30, 2026 12:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3303528	2	50	23,8	sleep4	0	-21	swapper/4	07:07:55	4
3551083	2	46	0,0	sleep7	3551084	-21	sh	09:15:29	7
3303899	99	44	42,2	cyclictest	3291645	-21	kworker/u16:2+flush-8:0	07:54:27	5
3303368	2	41	3,32	sleep7	0	-21	swapper/7	07:05:41	7
3303895	99	39	35,3	cyclictest	3565241	-21	kworker/u16:4+events_unbound	10:04:28	4
3303899	99	38	36,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	11:57:59	5
3303899	99	38	36,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	11:57:59	5
3303899	99	38	36,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	11:49:47	5
3303330	2	38	11,7	sleep5	0	-21	swapper/5	07:05:07	5
3303899	99	37	35,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	11:28:28	5
3303899	99	37	35,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	12:33:51	5
3303899	99	37	35,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	11:22:23	5
3303899	99	37	35,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	10:59:55	5
3303899	99	37	35,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	10:27:03	5
3303899	99	37	35,2	cyclictest	3432636	-21	kworker/u16:2+events_unbound	09:12:47	5
3303905	99	36	31,4	cyclictest	635	-21	systemd-journal	10:31:57	7
3303899	99	36	34,2	cyclictest	3953315	-21	kworker/u16:0+events_unbound	12:34:55	5
3303899	99	36	34,2	cyclictest	3953315	-21	kworker/u16:0+events_unbound	12:34:55	5
3303899	99	36	34,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	12:07:04	5
3303899	99	36	34,2	cyclictest	3747447	-21	kworker/u16:0+events_unbound	10:45:23	5
3303899	99	36	34,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	10:08:11	5
3303899	99	36	34,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	12:14:34	5
3303899	99	36	34,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	12:03:18	5
3303899	99	36	34,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	10:37:46	5
3303899	99	36	34,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	09:41:44	5
3303899	99	36	34,2	cyclictest	3481738	-21	kworker/u16:3+flush-8:0	09:24:43	5
3303905	99	35	30,4	cyclictest	3500007	-21	latency_hist	08:53:58	7
3303899	99	35	33,2	cyclictest	3747447	-21	kworker/u16:0+events_unbound	11:18:56	5
3303899	99	35	33,2	cyclictest	3747447	-21	kworker/u16:0+events_unbound	11:18:56	5
3303899	99	35	33,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	12:24:59	5
3303899	99	35	33,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	10:11:52	5
3303899	99	35	33,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	11:32:19	5
3303899	99	35	33,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	10:42:27	5
3303899	99	35	33,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	09:32:00	5
3303899	99	35	33,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	09:15:17	5
3303905	99	34	30,3	cyclictest	124	-21	kswapd0	10:58:25	7
3303901	99	34	31,2	cyclictest	3747447	-21	kworker/u16:0+flush-8:0	10:44:13	6
3303899	99	34	32,2	cyclictest	3855124	-21	kworker/u16:2+events_unbound	11:45:15	5
3303899	99	34	32,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	09:55:47	5
3303899	99	34	32,2	cyclictest	3565241	-21	kworker/u16:4+events_unbound	09:55:47	5
3303899	99	34	32,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	12:12:15	5
3303899	99	34	32,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	11:36:55	5
3303899	99	34	32,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	11:10:12	5
3303899	99	34	32,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	09:59:39	5
3303899	99	34	32,2	cyclictest	3500187	-21	kworker/u16:1+events_unbound	09:45:15	5
3303899	99	34	32,2	cyclictest	3481738	-21	kworker/u16:3+events_unbound	10:53:51	5
3303899	99	34	32,2	cyclictest	3481738	-21	kworker/u16:3+events_unbound	09:36:32	5
3303901	99	33	31,2	cyclictest	3461042	-21	kworker/u16:0+events_unbound	08:39:20	6
3303901	99	32	30,2	cyclictest	3953315	-21	kworker/u16:0+events_unbound	12:19:27	6
3303899	99	32	30,2	cyclictest	3747447	-21	kworker/u16:0+events_unbound	10:54:48	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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