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 Sat Apr 11, 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
918756	2	53	42,7	sleep6	0	-21	swapper/6	18:58:53	6
919293	99	50	47,2	cyclictest	124	-21	kswapd0	21:52:01	7
919293	99	48	43,4	cyclictest	1466520	-21	latency_hist	23:12:01	7
918792	2	46	35,8	sleep4	0	-21	swapper/4	18:59:23	4
919290	99	44	42,2	cyclictest	919032	-21	kworker/u16:4+flush-8:0	19:57:02	6
919288	99	44	42,2	cyclictest	1083061	-21	kworker/u16:2+flush-8:0	20:31:56	5
919290	99	40	37,2	cyclictest	1611944	-21	kworker/u16:0+events_unbound	00:17:03	6
918690	2	40	30,7	sleep5	0	-21	swapper/5	18:57:55	5
918672	2	39	3,31	sleep7	0	-21	swapper/7	18:57:41	7
919293	99	38	32,5	cyclictest	1236998	-21	latency_hist	21:37:01	7
919290	99	38	36,2	cyclictest	951700	-21	kworker/u16:1+flush-8:0	20:56:56	6
919288	99	37	35,2	cyclictest	1235021	-21	kworker/u16:3+flush-8:0	21:56:56	5
919288	99	36	34,2	cyclictest	1345762	-21	kworker/u16:2+events_unbound	00:01:25	5
919284	99	36	34,2	cyclictest	1647674	-21	kworker/u16:2+events_unbound	00:27:23	4
919288	99	35	32,2	cyclictest	1515275	-21	kworker/u16:1+flush-8:0	23:42:15	5
919284	99	34	31,3	cyclictest	1345762	-21	kworker/u16:2+flush-8:0	23:17:27	4
919290	99	33	30,2	cyclictest	1345762	-21	kworker/u16:2+flush-8:0	22:47:01	6
919290	99	32	30,2	cyclictest	919032	-21	kworker/u16:4+flush-8:0	20:07:32	6
919290	99	32	30,2	cyclictest	919031	-21	kworker/u16:0+flush-8:0	19:07:02	6
919290	99	31	29,2	cyclictest	980003	-21	kworker/u16:0+flush-8:0	19:32:01	6
919290	99	30	28,2	cyclictest	919032	-21	kworker/u16:4+flush-8:0	19:57:32	6
919288	99	30	28,2	cyclictest	1345762	-21	kworker/u16:2+events_unbound	22:57:21	5
919290	99	28	25,2	cyclictest	1028205	-21	kworker/u16:0+flush-8:0	20:22:17	6
919288	99	28	26,2	cyclictest	951700	-21	kworker/u16:1+flush-8:0	20:46:57	5
919288	99	28	25,2	cyclictest	1345762	-21	kworker/u16:2+flush-8:0	23:17:16	5
919288	99	28	25,2	cyclictest	1235021	-21	kworker/u16:3+flush-8:0	21:37:01	5
919290	99	27	23,3	cyclictest	1393992	-21	kworker/u16:0+flush-8:0	22:52:13	6
919288	99	27	25,2	cyclictest	919032	-21	kworker/u16:4+events_unbound	19:12:19	5
919288	99	27	25,2	cyclictest	1345762	-21	kworker/u16:2+events_unbound	00:07:31	5
919288	99	27	23,3	cyclictest	980003	-21	kworker/u16:0+flush-8:0	19:32:27	5
919284	99	27	26,1	cyclictest	1345763	-21	kworker/u16:4+flush-8:0	23:07:00	4
919290	99	26	24,2	cyclictest	1345762	-21	kworker/u16:2+events_unbound	00:05:33	6
919288	99	26	24,2	cyclictest	951700	-21	kworker/u16:1+flush-8:0	19:56:57	5
919293	99	25	24,0	cyclictest	0	-21	swapper/7	20:58:18	7
919290	99	25	23,2	cyclictest	951700	-21	kworker/u16:1+flush-8:0	19:27:01	6
919290	99	25	23,2	cyclictest	1345763	-21	kworker/u16:4+flush-8:0	22:57:22	6
919288	99	25	23,2	cyclictest	919032	-21	kworker/u16:4+flush-8:0	19:42:28	5
919293	99	24	20,3	cyclictest	1418103	-21	latency_hist	22:52:00	7
919293	99	24	0,22	cyclictest	1018503	-21	latency_hist	19:52:02	7
919290	99	24	22,2	cyclictest	1345762	-21	kworker/u16:2+events_unbound	23:27:21	6
919290	99	24	21,2	cyclictest	1345763	-21	kworker/u16:4+flush-8:0	23:12:16	6
919290	99	24	21,2	cyclictest	1249522	-21	kworker/u16:1+flush-8:0	22:02:19	6
919288	99	24	21,2	cyclictest	951700	-21	kworker/u16:1+events_unbound	20:02:21	5
919284	99	24	22,2	cyclictest	1200764	-21	kworker/u16:2+events_unbound	21:42:16	4
919293	99	23	22,0	cyclictest	0	-21	swapper/7	20:51:55	7
919290	99	23	21,2	cyclictest	919032	-21	kworker/u16:4+flush-8:0	19:12:22	6
919290	99	23	21,2	cyclictest	1587829	-21	kworker/u16:1+events_unbound	00:12:28	6
919290	99	23	21,2	cyclictest	1587829	-21	kworker/u16:1+events_unbound	00:12:28	6
919290	99	22	20,2	cyclictest	1345763	-21	kworker/u16:4+flush-8:0	22:32:27	6
919288	99	22	20,2	cyclictest	951700	-21	kworker/u16:1+events_unbound	19:17:18	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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