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 100 highest latencies:

System rack0slot2.osadl.org (updated Sun Mar 15, 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
170062	2	98	0,0	sleep4	0	-21	swapper/4	23:09:13	4
4112712	2	95	0,1	sleep7	4112713	-21	cut	21:24:09	7
3826261	2	58	48,7	sleep4	0	-21	swapper/4	19:01:12	4
3826746	99	54	51,2	cyclictest	152685	-21	kworker/u16:1+events_unbound	23:44:03	5
3826746	99	49	47,2	cyclictest	80992	-21	kworker/u16:3+events_unbound	22:34:11	5
3826746	99	49	47,2	cyclictest	80992	-21	kworker/u16:3+events_unbound	22:34:11	5
3826746	99	49	47,2	cyclictest	4177561	-21	kworker/u16:1+events_unbound	22:09:18	5
3826746	99	49	47,2	cyclictest	4095365	-21	kworker/u16:0+flush-8:0	21:33:48	5
3826748	99	48	45,2	cyclictest	3916363	-21	kworker/u16:3+flush-8:0	20:48:49	6
3826182	2	48	38,7	sleep6	0	-21	swapper/6	19:00:10	6
3826746	99	47	44,2	cyclictest	3856201	-21	kworker/u16:1+events_unbound	20:34:02	5
3826746	99	47	44,2	cyclictest	3856201	-21	kworker/u16:1+events_unbound	20:34:02	5
3826746	99	45	43,2	cyclictest	311456	-21	kworker/u16:2+flush-8:0	00:29:22	5
3826746	99	44	42,2	cyclictest	81100	-21	kworker/u16:5+flush-8:0	23:29:18	5
3826746	99	44	42,2	cyclictest	126837	-21	kworker/u16:2+events_unbound	23:19:02	5
3826751	99	43	38,4	cyclictest	4071424	-21	latency_hist	21:08:48	7
3826751	99	43	37,5	cyclictest	3964109	-21	latency_hist	20:13:49	7
3826751	99	43	0,41	cyclictest	650	-21	systemd-journal	21:48:48	7
3826748	99	42	39,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	21:14:02	6
3826746	99	42	40,2	cyclictest	81100	-21	kworker/u16:5+events_unbound	23:14:15	5
3826746	99	42	40,2	cyclictest	4060016	-21	kworker/u16:4+events_unbound	21:16:20	5
3826746	99	42	40,2	cyclictest	152685	-21	kworker/u16:1+events_unbound	23:59:10	5
3826746	99	42	40,1	cyclictest	4177561	-21	kworker/u16:1+events_unbound	22:24:03	5
3826746	99	41	39,2	cyclictest	81100	-21	kworker/u16:5+events_unbound	23:24:15	5
3826201	2	41	30,8	sleep5	0	-21	swapper/5	19:00:25	5
3826748	99	40	36,3	cyclictest	279877	-21	kworker/u16:4+flush-8:0	23:54:17	6
3826746	99	40	38,2	cyclictest	126837	-21	kworker/u16:2+flush-8:0	22:59:18	5
3826746	99	39	37,2	cyclictest	4095365	-21	kworker/u16:0+events_unbound	22:00:11	5
3817350	2	39	3,31	sleep7	0	-21	swapper/7	18:58:58	7
3826746	99	38	37,1	cyclictest	3856201	-21	kworker/u16:1+events_unbound	21:36:55	5
3826746	99	38	36,2	cyclictest	4177561	-21	kworker/u16:1+flush-8:0	22:29:04	5
3826746	99	38	36,2	cyclictest	152685	-21	kworker/u16:1+events_unbound	23:40:46	5
3826748	99	37	34,2	cyclictest	3807493	-21	kworker/u16:0+flush-8:0	19:49:14	6
3826746	99	37	35,2	cyclictest	81100	-21	kworker/u16:5+flush-8:0	23:34:23	5
3826746	99	37	35,2	cyclictest	4095365	-21	kworker/u16:0+events_unbound	21:46:03	5
3826746	99	37	35,2	cyclictest	271634	-21	kworker/u16:0+events_unbound	23:57:34	5
3826746	99	37	35,2	cyclictest	247459	-21	kworker/u16:3+events_unbound	00:19:23	5
3826746	99	37	35,2	cyclictest	126837	-21	kworker/u16:2+events_unbound	22:51:19	5
3826748	99	36	34,2	cyclictest	4080239	-21	kworker/u16:5+flush-8:0	21:33:44	6
3826746	99	36	34,2	cyclictest	271634	-21	kworker/u16:0+events_unbound	00:13:10	5
3826746	99	36	34,2	cyclictest	247459	-21	kworker/u16:3+events_unbound	00:26:47	5
3826746	99	35	33,2	cyclictest	81100	-21	kworker/u16:5+events_unbound	22:39:10	5
3826746	99	35	33,2	cyclictest	4177561	-21	kworker/u16:1+events_unbound	22:45:39	5
3826746	99	35	33,2	cyclictest	4177561	-21	kworker/u16:1+events_unbound	22:15:59	5
3826746	99	35	33,2	cyclictest	4095365	-21	kworker/u16:0+events_unbound	21:27:11	5
3826746	99	35	33,2	cyclictest	271634	-21	kworker/u16:0+events_unbound	00:18:46	5
3826746	99	34	33,1	cyclictest	4140532	-21	kworker/u16:2+events_unbound	21:43:07	5
3826746	99	34	32,2	cyclictest	4095365	-21	kworker/u16:0+events_unbound	21:52:59	5
3826746	99	34	32,2	cyclictest	4080239	-21	kworker/u16:5+events_unbound	21:10:48	5
3826746	99	34	32,2	cyclictest	4080239	-21	kworker/u16:5+events_unbound	21:10:48	5
3826746	99	34	32,2	cyclictest	126837	-21	kworker/u16:2+events_unbound	23:04:21	5
3826748	99	33	30,2	cyclictest	3789588	-21	kworker/u16:2+flush-8:0	19:14:04	6
3826746	99	33	31,2	cyclictest	9398	-21	kworker/u16:4+events_unbound	22:08:47	5
3826746	99	33	31,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	19:19:04	5
3826748	99	32	29,2	cyclictest	311456	-21	kworker/u16:2+flush-8:0	00:18:43	6
3826746	99	32	30,2	cyclictest	4095365	-21	kworker/u16:0+flush-8:0	21:54:54	5
3826746	99	32	30,2	cyclictest	4095365	-21	kworker/u16:0+flush-8:0	21:54:54	5
3826746	99	32	30,2	cyclictest	3916363	-21	kworker/u16:3+events_unbound	20:14:13	5
3826751	99	31	26,4	cyclictest	4130970	-21	latency_hist	21:33:49	7
3826746	99	31	30,1	cyclictest	126837	-21	kworker/u16:2+events_unbound	23:11:48	5
3826746	99	31	29,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	20:59:07	5
3826746	99	31	29,2	cyclictest	271634	-21	kworker/u16:0+events_unbound	00:04:58	5
3826751	99	30	0,29	cyclictest	4095364	-21	sed	21:18:48	7
3826748	99	30	28,2	cyclictest	3836300	-21	kworker/u16:3+flush-8:0	19:13:49	6
3826751	99	29	27,1	cyclictest	93758	-21	if_err_p4p1	22:39:03	7
3826748	99	29	25,3	cyclictest	4095365	-21	kworker/u16:0+flush-8:0	21:44:16	6
3826746	99	29	27,2	cyclictest	126837	-21	kworker/u16:2+events_unbound	22:58:15	5
3826746	99	29	26,2	cyclictest	3916363	-21	kworker/u16:3+events_unbound	19:59:03	5
3826746	99	28	26,2	cyclictest	9398	-21	kworker/u16:4+events_unbound	22:22:10	5
3826746	99	28	26,2	cyclictest	4080239	-21	kworker/u16:5+events_unbound	21:22:47	5
3826746	99	28	26,2	cyclictest	126837	-21	kworker/u16:2+events_unbound	23:50:26	5
237291	2	28	0,1	chrt	237294	-21	kernelversion	23:39:06	7
3826751	99	27	22,4	cyclictest	650	-21	systemd-journal	23:28:48	7
3826746	99	27	25,2	cyclictest	3856201	-21	kworker/u16:1+events_unbound	21:04:58	5
3826746	99	27	24,2	cyclictest	3916363	-21	kworker/u16:3+events_unbound	20:44:02	5
3826751	99	26	23,2	cyclictest	306971	-21	munin-run	00:08:48	7
3826748	99	26	24,2	cyclictest	4140532	-21	kworker/u16:2+flush-8:0	21:50:26	6
3826748	99	26	24,2	cyclictest	271634	-21	kworker/u16:0+flush-8:0	00:09:17	6
3826748	99	26	23,2	cyclictest	4031310	-21	kworker/u16:0+flush-8:0	20:49:10	6
3826746	99	26	24,2	cyclictest	3916363	-21	kworker/u16:3+flush-8:0	20:43:19	5
3826746	99	26	24,2	cyclictest	3807493	-21	kworker/u16:0+events_unbound	19:29:20	5
3826746	99	26	24,2	cyclictest	3789588	-21	kworker/u16:2+events_unbound	19:34:19	5
288741	2	26	0,1	chrt	288744	-21	cut	23:59:10	7
3826748	99	25	23,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	21:39:04	6
3826746	99	25	23,2	cyclictest	3789588	-21	kworker/u16:2+events_unbound	19:14:18	5
3826746	99	25	22,2	cyclictest	3916363	-21	kworker/u16:3+events_unbound	20:04:02	5
3826751	99	24	0,23	cyclictest	354566	-21	latency_hist	00:28:48	7
3826751	99	24	0,22	cyclictest	3841383	-21	cut	19:09:07	7
3826748	99	24	22,2	cyclictest	3789588	-21	kworker/u16:2+flush-8:0	19:19:17	6
3826746	99	24	21,2	cyclictest	3916363	-21	kworker/u16:3+events_unbound	19:54:02	5
3826751	99	23	19,3	cyclictest	124	-21	kswapd0	22:13:48	7
3826748	99	23	21,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	20:33:48	6
3826746	99	23	21,2	cyclictest	3856201	-21	kworker/u16:1+flush-8:0	19:39:16	5
106323	2	23	0,1	chrt	0	-21	swapper/6	22:44:07	6
3826748	99	22	19,2	cyclictest	126837	-21	kworker/u16:2+flush-8:0	23:23:53	6
3826748	99	21	19,2	cyclictest	4154807	-21	kworker/u16:3+flush-8:0	22:04:16	6
3826748	99	21	19,2	cyclictest	4031310	-21	kworker/u16:0+flush-8:0	21:04:15	6
3826746	99	21	19,2	cyclictest	3916363	-21	kworker/u16:3+flush-8:0	20:29:07	5
3826751	99	20	12,7	cyclictest	0	-21	swapper/7	00:13:48	7
3826751	99	20	0,19	cyclictest	4081176	-21	ssh	21:09:31	7
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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