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 Wed Mar 25, 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
185325	2	57	47,7	sleep5	0	-21	swapper/5	19:00:21	5
185315	2	57	46,8	sleep4	0	-21	swapper/4	19:00:12	4
185818	99	48	42,5	cyclictest	650	-21	systemd-journal	21:58:08	7
185818	99	47	40,6	cyclictest	208496	-21	latency_hist	19:13:09	7
185816	99	42	38,3	cyclictest	218437	-21	kworker/u16:0+flush-8:0	19:28:40	6
185816	99	42	38,3	cyclictest	218437	-21	kworker/u16:0+flush-8:0	19:28:40	6
185259	2	42	32,7	sleep6	0	-21	swapper/6	18:59:26	6
185818	99	40	0,38	cyclictest	256196	-21	latency_hist	19:38:09	7
185143	2	40	3,31	sleep7	0	-21	swapper/7	18:58:47	7
185818	99	39	0,37	cyclictest	562858	-21	latency_hist	22:03:09	7
185818	99	37	31,5	cyclictest	650	-21	systemd-journal	21:33:08	7
185808	99	37	34,2	cyclictest	755587	-21	kworker/u16:0+flush-8:0	23:43:03	5
185818	99	36	0,34	cyclictest	284955	-21	sed	19:53:09	7
185808	99	36	34,2	cyclictest	623142	-21	kworker/u16:3+flush-8:0	22:38:04	5
185808	99	33	32,1	cyclictest	623142	-21	kworker/u16:3+events_unbound	22:43:34	5
185816	99	32	30,2	cyclictest	755587	-21	kworker/u16:0+flush-8:0	23:43:40	6
185816	99	32	30,2	cyclictest	218437	-21	kworker/u16:0+flush-8:0	19:18:27	6
185808	99	32	30,2	cyclictest	693807	-21	kworker/u16:4+flush-8:0	23:08:03	5
341160	2	31	0,0	chrt	341159	-21	/usr/sbin/munin	20:18:34	7
185816	99	31	29,2	cyclictest	346604	-21	kworker/u16:4+events_unbound	21:13:27	6
185808	99	31	29,2	cyclictest	719453	-21	kworker/u16:1+events_unbound	23:28:33	5
185808	99	31	29,2	cyclictest	294461	-21	kworker/u16:4+events_unbound	20:08:32	5
185808	99	31	28,2	cyclictest	502707	-21	kworker/u16:0+events_unbound	21:53:21	5
185808	99	31	28,2	cyclictest	132667	-21	kworker/u16:1+flush-8:0	19:13:24	5
185808	99	30	28,2	cyclictest	623143	-21	kworker/u16:4+events_unbound	22:38:35	5
185808	99	30	28,2	cyclictest	346604	-21	kworker/u16:4+events_unbound	21:23:37	5
185808	99	30	27,2	cyclictest	452689	-21	kworker/u16:1+flush-8:0	21:58:14	5
185818	99	29	28,0	cyclictest	0	-21	swapper/7	20:38:40	7
185808	99	29	27,2	cyclictest	693807	-21	kworker/u16:4+flush-8:0	23:18:38	5
695066	2	28	0,1	chrt	695065	-21	ssh	22:57:33	7
185816	99	28	26,2	cyclictest	275465	-21	kworker/u16:2+flush-8:0	19:48:31	6
185816	99	28	25,2	cyclictest	452689	-21	kworker/u16:1+events_unbound	21:28:22	6
658349	2	27	0,1	chrt	658347	-21	ssh	22:41:22	7
185818	99	27	22,4	cyclictest	900067	-21	latency_hist	00:23:08	7
185818	99	27	0,25	cyclictest	361183	-21	latency_hist	20:33:09	7
185816	99	27	25,2	cyclictest	623144	-21	kworker/u16:5+events_unbound	22:33:38	6
185816	99	27	25,2	cyclictest	399128	-21	kworker/u16:0+flush-8:0	21:03:47	6
185808	99	27	25,2	cyclictest	599237	-21	kworker/u16:2+flush-8:0	00:08:39	5
185808	99	27	25,2	cyclictest	502707	-21	kworker/u16:0+events_unbound	21:38:34	5
185808	99	27	25,2	cyclictest	502707	-21	kworker/u16:0+events_unbound	21:38:34	5
674892	2	26	0,1	chrt	74	1	rcuc/5	22:48:26	5
633446	2	26	0,0	sleep6	0	-21	swapper/6	22:29:59	6
185818	99	26	25,0	cyclictest	0	-21	swapper/7	19:28:08	7
185816	99	26	24,2	cyclictest	693807	-21	kworker/u16:4+flush-8:0	23:33:25	6
185816	99	26	24,2	cyclictest	527195	-21	kworker/u16:4+events_unbound	22:18:08	6
185816	99	26	24,2	cyclictest	452689	-21	kworker/u16:1+events_unbound	22:18:35	6
185816	99	26	24,2	cyclictest	452689	-21	kworker/u16:1+events_unbound	21:58:32	6
185816	99	26	24,2	cyclictest	218437	-21	kworker/u16:0+events_unbound	19:23:35	6
185808	99	26	23,2	cyclictest	876078	-21	kworker/u16:1+flush-8:0	00:33:03	5
185818	99	25	0,23	cyclictest	294459	-21	cat	19:58:09	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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