OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #7, slot #2

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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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack7slot2.osadl.org (updated Thu Jun 04, 2026 00:44:10)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3787837	99	131	115,11	cyclictest	53	-21	kswapd0	22:50:12	0
3787837	99	117	93,16	cyclictest	53	-21	kswapd0	21:10:19	0
3787838	99	101	93,6	cyclictest	3916651	-21	kworker/u4:10+events_unbound	00:03:06	1
3787838	99	99	92,5	cyclictest	3890645	-21	kworker/u4:18+events_unbound	22:57:04	1
3787838	99	97	86,7	cyclictest	3914744	-21	/usr/sbin/munin	23:15:11	1
3787838	99	97	86,7	cyclictest	3914744	-21	/usr/sbin/munin	23:15:11	1
3787837	99	83	38,6	cyclictest	0	-21	swapper/0	00:10:08	0
3787837	99	83	38,6	cyclictest	0	-21	swapper/0	00:10:08	0
3787838	99	78	65,10	cyclictest	3890641	-21	kworker/u4:14+events_unbound	22:55:01	1
3787837	99	77	69,5	cyclictest	3795050	-21	kworker/u4:10+events_unbound	20:00:02	0
3787837	99	77	63,12	cyclictest	3888825	-21	fschecks_count	22:45:18	0
3787838	99	73	63,7	cyclictest	3917310	-21	kworker/u4:13+events_unbound	23:22:08	1
3787838	99	72	60,8	cyclictest	3805470	-21	kworker/u4:12+events_unbound	21:31:52	1
3787837	99	72	15,47	cyclictest	0	-21	swapper/0	19:35:07	0
3787837	99	70	37,27	cyclictest	53	-21	kswapd0	23:15:07	0
3787837	99	70	37,27	cyclictest	53	-21	kswapd0	23:15:07	0
3787838	99	69	60,6	cyclictest	0	-21	swapper/1	21:10:19	1
3787838	99	69	58,8	cyclictest	3785332	-21	kworker/u4:4+events_unbound	19:26:30	1
3787838	99	67	48,7	cyclictest	3795049	-21	kworker/u4:8+events_unbound	21:26:51	1
3787838	99	66	56,7	cyclictest	3805469	-21	kworker/u4:11+events_unbound	21:05:00	1
3787837	99	65	25,17	cyclictest	3932960	-21	ntpq	23:35:30	0
3787838	99	64	55,6	cyclictest	3855623	-21	kworker/u4:4+events_unbound	22:17:00	1
3787837	99	63	55,6	cyclictest	3872838	-21	kworker/u4:3+events_unbound	22:27:00	0
3787837	99	63	27,8	cyclictest	3801447	-21	apt-get	20:40:20	0
3787837	99	63	16,22	cyclictest	3906950	-21	processes	23:05:36	0
3787837	99	62	20,15	cyclictest	3825944	-21	ssh	21:33:49	0
3787837	99	61	28,7	cyclictest	3844594	-21	apt-get	21:55:13	0
3787837	99	61	26,17	cyclictest	3813768	-21	apt-get	21:20:10	0
3787837	99	61	20,15	cyclictest	3920954	-21	ssh	23:21:28	0
3787838	99	60	52,6	cyclictest	3795049	-21	kworker/u4:8+events_unbound	20:36:44	1
3787838	99	60	52,6	cyclictest	3792018	-21	kworker/u4:7+events_unbound	19:36:34	1
3787837	99	60	49,9	cyclictest	317	-21	systemd-journal	21:46:54	0
3787837	99	60	21,15	cyclictest	3886050	-21	ssh	22:41:38	0
3787837	99	60	21,13	cyclictest	3834434	-21	ssh	21:43:18	0
3787838	99	59	47,9	cyclictest	37	-21	kcompactd0	22:45:18	1
3787837	99	59	36,20	cyclictest	256	50	irq/23-42890000.ethernet	21:05:10	0
3787837	99	59	20,16	cyclictest	3944649	-21	ssh	23:49:23	0
3787837	99	59	16,10	cyclictest	3959211	-21	ntpq	00:05:28	0
3787838	99	58	26,22	cyclictest	27	1	ktimers/1	22:00:28	1
3787837	99	58	49,6	cyclictest	3916651	-21	kworker/u4:10+events_unbound	23:27:09	0
3787837	99	58	22,11	cyclictest	3914212	-21	ssh	23:14:39	0
3787837	99	58	20,13	cyclictest	3849801	-21	ntpq	22:00:32	0
3787837	99	58	18,9	cyclictest	3928616	-21	ssh	23:30:31	0
3787837	99	58	17,17	cyclictest	3988193	-21	sshd	00:39:06	0
3787837	99	58	15,23	cyclictest	3841439	-21	/usr/sbin/munin	21:50:40	0
3787838	99	57	43,10	cyclictest	0	-21	swapper/1	00:15:13	1
3787837	99	57	23,7	cyclictest	3805026	-21	ntpq	21:00:27	0
3787837	99	57	20,13	cyclictest	3937327	-21	ntpq	23:40:28	0
3787837	99	57	18,14	cyclictest	3970186	-21	ssh	00:18:18	0
3787837	99	57	18,14	cyclictest	3859179	-21	ssh	22:10:46	0
3787838	99	56	47,6	cyclictest	3790560	-21	kworker/u4:13+events_unbound	20:06:39	1
3787838	99	56	46,7	cyclictest	3814949	-21	timerwakeupswit	21:20:39	1
3787838	99	56	45,8	cyclictest	3985749	-21	switchtime	00:35:37	1
3787837	99	56	35,17	cyclictest	3789484	-21	apt-get	19:20:08	0
3787837	99	56	35,16	cyclictest	3902870	-21	ssh	23:00:42	0
3787837	99	56	20,10	cyclictest	3952914	-21	ssh	23:58:38	0
3787837	99	56	20,10	cyclictest	3952914	-21	ssh	23:58:38	0
3787837	99	56	16,16	cyclictest	3875980	-21	ntpq	22:30:25	0
3787837	99	56	13,31	cyclictest	0	-21	swapper/0	00:20:39	0
3787838	99	55	47,6	cyclictest	3787835	-21	cyclictest	23:55:11	1
3787838	99	55	47,6	cyclictest	3787835	-21	cyclictest	23:55:11	1
3787837	99	55	35,14	cyclictest	3799877	-21	apt-get	20:30:08	0
3787837	99	55	34,16	cyclictest	3954864	-21	ntpq	00:00:28	0
3787837	99	55	20,11	cyclictest	3792513	-21	apt-get	19:40:08	0
3787837	99	55	18,13	cyclictest	3796014	-21	ntpq	20:00:19	0
3787837	99	55	14,22	cyclictest	1	-21	systemd	20:52:44	0
3787838	99	54	40,8	cyclictest	0	-21	swapper/1	22:25:32	1
3787838	99	54	39,9	cyclictest	0	-21	swapper/1	23:10:00	1
3787837	99	54	35,15	cyclictest	3862165	-21	apt-get	22:15:12	0
3787837	99	54	34,15	cyclictest	3981050	-21	ssh	00:30:27	0
3787837	99	54	19,11	cyclictest	3798416	-21	apt-get	20:20:11	0
3787838	99	53	37,6	cyclictest	3855623	-21	kworker/u4:4+events_unbound	22:35:59	1
3787837	99	53	45,5	cyclictest	3897878	-21	/usr/sbin/munin	22:55:21	0
3787837	99	53	35,12	cyclictest	3867540	-21	ps	22:20:37	0
3787837	99	53	18,12	cyclictest	3854279	-21	ntpq	22:05:36	0
3787837	99	53	17,12	cyclictest	3879965	-21	diskstats	22:35:17	0
3787837	99	53	17,10	cyclictest	3830912	-21	ssh	21:39:43	0
3787837	99	53	14,8	cyclictest	3975959	-21	apt-get	00:25:13	0
3787838	99	52	46,5	cyclictest	3786564	-21	kworker/u4:6+events_unbound	19:10:02	1
3787838	99	52	45,5	cyclictest	3958827	-21	fschecks_count	00:05:19	1
3787838	99	52	37,9	cyclictest	0	-21	swapper/1	19:50:31	1
3787837	99	52	35,12	cyclictest	3788687	-21	ps	19:10:37	0
3787837	99	52	16,12	cyclictest	3819086	-21	ntpq	21:25:35	0
3787838	99	51	43,5	cyclictest	3977140	-21	/usr/sbin/munin	00:25:39	1
3787838	99	51	40,9	cyclictest	3942024	-21	mailstats	23:45:38	1
3787838	99	51	40,8	cyclictest	0	-21	swapper/1	21:35:30	1
3787838	99	50	41,6	cyclictest	0	-21	swapper/1	23:50:19	1
3787838	99	50	41,6	cyclictest	0	-21	swapper/1	23:50:19	1
3787838	99	50	40,6	cyclictest	0	-21	swapper/1	22:11:57	1
3787838	99	50	34,7	cyclictest	0	-21	swapper/1	20:35:00	1
3787838	99	50	33,11	cyclictest	3796560	-21	modprobe	20:05:01	1
3787837	99	50	37,9	cyclictest	3811448	-21	ssh	21:16:49	0
3787837	99	50	35,10	cyclictest	3945338	-21	apt-get	23:50:12	0
3787837	99	50	35,10	cyclictest	3945338	-21	apt-get	23:50:12	0
3787837	99	50	16,10	cyclictest	3791288	-21	perl	19:30:15	0
3787838	99	49	41,6	cyclictest	3802531	-21	kworker/u4:6+events_unbound	20:51:47	1
3787838	99	49	38,8	cyclictest	3798013	-21	modprobe	20:15:00	1
3787838	99	49	38,7	cyclictest	0	-21	swapper/1	23:35:35	1
3787838	99	49	3,39	cyclictest	3845280	-21	ssh	21:55:25	1
3787837	99	49	23,9	cyclictest	3798109	-21	sed	20:15:01	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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