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 Mon Jun 01, 2026 00:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
358114	2	68	0,1	sleep5	76	-21	ksoftirqd/5	20:02:15	5
242044	2	48	38,7	sleep4	0	-21	swapper/4	19:05:18	4
609577	2	46	0,0	sleep7	609578	-21	sh	22:02:05	7
242449	99	45	43,2	cyclictest	883921	-21	kworker/u16:2+events_unbound	23:57:53	5
242449	99	44	42,2	cyclictest	597082	-21	kworker/u16:0+events_unbound	22:27:24	5
242449	99	41	39,2	cyclictest	813785	-21	kworker/u16:1+events_unbound	23:30:14	5
233555	2	39	3,30	sleep7	0	-21	swapper/7	19:02:08	7
242459	99	35	32,2	cyclictest	786923	-21	ssh	23:12:17	7
242449	99	35	33,2	cyclictest	729789	-21	kworker/u16:0+events_unbound	23:19:02	5
937060	2	34	0,1	chrt	937058	-21	ssh	00:21:25	7
242459	99	33	27,5	cyclictest	635	-21	systemd-journal	22:26:52	7
242459	99	33	27,5	cyclictest	313384	-21	latency_hist	19:41:52	7
242449	99	32	30,2	cyclictest	862165	-21	kworker/u16:0+events_unbound	23:52:50	5
242449	99	32	30,2	cyclictest	476826	-21	kworker/u16:3+events_unbound	22:05:03	5
242459	99	31	30,0	cyclictest	0	-21	swapper/7	19:27:07	7
242453	99	31	29,2	cyclictest	642739	-21	kworker/u16:1+events_unbound	22:17:18	6
242449	99	31	29,2	cyclictest	883921	-21	kworker/u16:2+events_unbound	00:21:01	5
242449	99	31	29,2	cyclictest	862165	-21	kworker/u16:0+events_unbound	23:49:50	5
242449	99	31	29,2	cyclictest	693396	-21	kworker/u16:4+events_unbound	23:03:02	5
242449	99	31	29,2	cyclictest	693396	-21	kworker/u16:4+events_unbound	23:03:02	5
242449	99	31	29,2	cyclictest	693396	-21	kworker/u16:4+events_unbound	22:57:02	5
242449	99	31	29,2	cyclictest	409190	-21	kworker/u16:1+events_unbound	21:25:19	5
242459	99	30	29,0	cyclictest	0	-21	swapper/7	21:47:05	7
242459	99	30	29,0	cyclictest	0	-21	swapper/7	20:22:22	7
242449	99	30	28,2	cyclictest	729789	-21	kworker/u16:0+events_unbound	23:16:37	5
242449	99	30	28,2	cyclictest	642739	-21	kworker/u16:1+events_unbound	22:54:14	5
242449	99	30	28,2	cyclictest	536740	-21	kworker/u16:4+events_unbound	21:38:03	5
242449	99	30	28,2	cyclictest	351364	-21	kworker/u16:2+events_unbound	21:51:34	5
242459	99	29	23,5	cyclictest	657197	-21	latency_hist	22:21:52	7
242449	99	29	27,2	cyclictest	883921	-21	kworker/u16:2+events_unbound	00:32:01	5
242449	99	29	27,2	cyclictest	729789	-21	kworker/u16:0+events_unbound	23:11:34	5
242449	99	29	27,2	cyclictest	351364	-21	kworker/u16:2+events_unbound	21:36:39	5
242449	99	29	27,2	cyclictest	351364	-21	kworker/u16:2+events_unbound	21:09:02	5
242449	99	29	26,2	cyclictest	476826	-21	kworker/u16:3+flush-8:0	21:41:53	5
242449	99	29	25,3	cyclictest	693396	-21	kworker/u16:4+events_unbound	23:43:29	5
242449	99	29	25,3	cyclictest	693396	-21	kworker/u16:4+events_unbound	23:43:29	5
242459	99	28	26,1	cyclictest	0	-21	swapper/7	21:37:18	7
242459	99	28	22,5	cyclictest	635	-21	systemd-journal	23:46:51	7
242459	99	28	22,5	cyclictest	635	-21	systemd-journal	23:46:51	7
242449	99	28	26,2	cyclictest	693396	-21	kworker/u16:4+events_unbound	22:43:22	5
242449	99	28	26,2	cyclictest	409190	-21	kworker/u16:1+events_unbound	21:20:51	5
242449	99	28	26,2	cyclictest	351364	-21	kworker/u16:2+flush-8:0	22:09:01	5
241979	2	28	17,8	sleep5	0	-21	swapper/5	19:04:23	5
242459	99	27	26,0	cyclictest	0	-21	swapper/7	23:27:20	7
242459	99	27	26,0	cyclictest	0	-21	swapper/7	23:07:06	7
242459	99	27	26,0	cyclictest	0	-21	swapper/7	21:27:15	7
242459	99	27	25,1	cyclictest	0	-21	swapper/7	00:07:12	7
242449	99	27	26,1	cyclictest	790331	-21	kworker/u16:2+events_unbound	23:26:19	5
242449	99	27	25,2	cyclictest	886169	-21	kworker/u16:3+events_unbound	00:02:54	5
242449	99	27	25,2	cyclictest	883921	-21	kworker/u16:2+events_unbound	00:25:30	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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