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 Aug 06, 2026 00:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1541443	99	48	42,5	cyclictest	1958552	-21	latency_hist	22:23:30	7
1540853	2	47	12,30	sleep7	0	-21	swapper/7	19:04:26	7
1541438	99	42	39,2	cyclictest	2003534	-21	kworker/u16:2+events_unbound	23:53:31	6
1541429	99	41	39,2	cyclictest	1718966	-21	kworker/u16:0+events_unbound	21:18:30	4
1541443	99	40	39,0	cyclictest	0	-21	swapper/7	20:39:00	7
1541429	99	40	37,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	22:08:32	4
1541443	99	39	33,5	cyclictest	1994674	-21	latency_hist	22:38:30	7
1541438	99	38	36,2	cyclictest	2163491	-21	kworker/u16:0+events_unbound	00:16:32	6
1541429	99	38	36,2	cyclictest	2150288	-21	kworker/u16:3+events_unbound	00:06:15	4
1541429	99	38	36,2	cyclictest	2150288	-21	kworker/u16:3+events_unbound	00:06:15	4
1540830	2	38	27,7	sleep5	0	-21	swapper/5	19:04:08	5
1541438	99	37	35,2	cyclictest	2016899	-21	kworker/u16:3+events_unbound	23:06:48	6
1541443	99	36	34,1	cyclictest	0	-21	swapper/7	23:27:59	7
1541443	99	36	34,1	cyclictest	0	-21	swapper/7	23:27:59	7
1541438	99	36	34,2	cyclictest	1946591	-21	kworker/u16:0+events_unbound	22:35:28	6
1541438	99	36	34,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	23:18:28	6
1541438	99	36	34,2	cyclictest	1690312	-21	kworker/u16:2+flush-8:0	20:38:54	6
1541429	99	36	33,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	21:48:32	4
1541429	99	36	32,3	cyclictest	1790008	-21	kworker/u16:4+flush-8:0	21:23:30	4
1541443	99	35	34,0	cyclictest	0	-21	swapper/7	21:33:33	7
1541443	99	35	30,4	cyclictest	2079086	-21	latency_hist	23:13:30	7
1541438	99	35	33,2	cyclictest	1811762	-21	kworker/u16:2+events_unbound	21:25:56	6
1541438	99	35	33,2	cyclictest	1790008	-21	kworker/u16:4+events_unbound	21:42:56	6
1541429	99	35	34,1	cyclictest	1838242	-21	kworker/u16:1+events_unbound	22:04:16	4
1541429	99	35	33,2	cyclictest	2079128	-21	kworker/u16:0+events_unbound	23:39:40	4
1541429	99	35	33,2	cyclictest	1946591	-21	kworker/u16:0+events_unbound	22:19:56	4
1541429	99	35	33,2	cyclictest	1910512	-21	kworker/u16:4+events_unbound	22:36:09	4
1541429	99	35	33,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	22:51:16	4
1541429	99	35	32,3	cyclictest	1718966	-21	kworker/u16:0+events_unbound	22:02:48	4
1541443	99	34	33,0	cyclictest	0	-21	swapper/7	23:21:28	7
1541443	99	34	32,1	cyclictest	1777957	-21	diskmemload	22:26:48	7
1541438	99	34	32,2	cyclictest	2079128	-21	kworker/u16:0+events_unbound	23:29:23	6
1541438	99	34	32,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	21:46:56	6
1541429	99	34	32,2	cyclictest	2079128	-21	kworker/u16:0+flush-8:0	23:30:43	4
1541429	99	34	32,2	cyclictest	2003534	-21	kworker/u16:2+flush-8:0	22:44:16	4
1541429	99	34	32,2	cyclictest	2003534	-21	kworker/u16:2+flush-8:0	22:44:16	4
1541429	99	34	32,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	23:24:59	4
1541429	99	34	32,2	cyclictest	1838242	-21	kworker/u16:1+events_unbound	23:24:59	4
1541443	99	33	31,1	cyclictest	2042262	-21	ssh	22:57:20	7
1541443	99	33	27,5	cyclictest	1574202	-21	latency_hist	19:23:31	7
1541438	99	33	31,2	cyclictest	1838242	-21	kworker/u16:1+flush-8:0	22:48:03	6
1541438	99	33	31,2	cyclictest	1838242	-21	kworker/u16:1+flush-8:0	22:48:03	6
1541438	99	33	31,2	cyclictest	1838242	-21	kworker/u16:1+flush-8:0	22:41:44	6
1541438	99	33	30,2	cyclictest	1718966	-21	kworker/u16:0+flush-8:0	20:53:33	6
1541429	99	33	31,2	cyclictest	2235183	-21	kworker/u16:1+flush-8:0	00:30:27	4
1541429	99	33	31,2	cyclictest	2235183	-21	kworker/u16:1+events_unbound	00:35:32	4
1541429	99	33	31,2	cyclictest	2150288	-21	kworker/u16:3+flush-8:0	23:48:08	4
1541429	99	33	31,2	cyclictest	2079128	-21	kworker/u16:0+events_unbound	23:17:59	4
1541429	99	33	31,2	cyclictest	2003534	-21	kworker/u16:2+flush-8:0	22:42:36	4
1541429	99	33	31,2	cyclictest	2003534	-21	kworker/u16:2+flush-8:0	00:12:11	4
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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