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 Wed Aug 19, 2026 12:44:07)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2643506	99	106	80,24	cyclictest	53	-21	kswapd0	12:30:12	0
2643506	99	104	95,7	cyclictest	2841781	-21	kworker/u4:7+events_unbound	12:23:58	0
2643508	99	103	90,9	cyclictest	2710774	-21	apt-get	09:50:12	1
2643506	99	92	38,51	cyclictest	256	50	irq/23-42890000.ethernet	09:50:13	0
2643506	99	80	72,6	cyclictest	2788407	-21	kworker/u4:8+events_unbound	11:23:46	0
2643506	99	74	69,3	cyclictest	2819268	-21	kworker/u4:8+events_unbound	12:13:57	0
2643506	99	73	63,8	cyclictest	2726658	-21	kworker/u4:3+events_unbound	10:08:37	0
2643506	99	72	57,10	cyclictest	2643504	-21	cyclictest	12:09:42	0
2643508	99	69	62,5	cyclictest	2854695	-21	kworker/u4:2+events_unbound	12:39:01	1
2643506	99	69	61,6	cyclictest	2699396	-21	kworker/u4:13+events_unbound	09:38:35	0
2643506	99	67	58,6	cyclictest	2681747	-21	kworker/u4:6+events_unbound	09:18:32	0
2643506	99	67	33,28	cyclictest	256	50	irq/23-42890000.ethernet	07:40:12	0
2643506	99	66	59,6	cyclictest	2797406	-21	kworker/u4:10+events_unbound	11:28:47	0
2643506	99	65	53,8	cyclictest	2825959	-21	apt-get	12:00:17	0
2643506	99	63	55,6	cyclictest	2674295	-21	kworker/u4:4+events_unbound	09:58:37	0
2643508	99	62	54,6	cyclictest	2674295	-21	kworker/u4:4+events_unbound	09:13:31	1
2643508	99	59	40,5	cyclictest	17	1	rcu_preempt	09:24:59	1
2643506	99	58	41,11	cyclictest	2667940	-21	modprobe	08:44:59	0
2643506	99	58	35,21	cyclictest	2651304	-21	latency_hist	07:40:02	0
2643506	99	57	50,5	cyclictest	2655129	-21	kworker/u4:16+events_unbound	08:18:17	0
2643506	99	57	38,17	cyclictest	2692422	-21	munin-plugin-st	09:30:00	0
2643508	99	56	46,7	cyclictest	2783921	-21	kworker/u4:2+events_unbound	11:18:45	1
2643506	99	56	48,6	cyclictest	2656401	-21	kworker/u4:20+events_unbound	08:53:27	0
2643506	99	56	36,14	cyclictest	53	-21	kswapd0	10:10:13	0
2643508	99	55	45,8	cyclictest	2738581	-21	ssh	10:20:39	1
2643506	99	55	48,5	cyclictest	2762081	-21	kworker/u4:0+events_unbound	11:05:02	0
2643506	99	55	44,9	cyclictest	2764292	-21	fschecks_count	10:50:19	0
2643506	99	55	34,19	cyclictest	2800037	-21	/usr/sbin/munin	11:30:24	0
2643508	99	54	46,6	cyclictest	0	-21	swapper/1	09:45:15	1
2643508	99	54	46,5	cyclictest	2653439	-21	sendmail_mailqu	07:45:36	1
2643508	99	54	22,19	cyclictest	0	-21	swapper/1	12:20:00	1
2643508	99	54	22,19	cyclictest	0	-21	swapper/1	11:55:35	1
2643508	99	54	22,19	cyclictest	0	-21	swapper/1	11:55:34	1
2643508	99	53	43,7	cyclictest	53	-21	kswapd0	10:15:17	1
2643508	99	53	43,7	cyclictest	0	-21	swapper/1	09:15:15	1
2643508	99	53	36,13	cyclictest	2810946	-21	ssh	11:42:46	1
2643506	99	53	43,8	cyclictest	2751018	-21	fschecks_time	10:35:20	0
2643506	99	53	42,9	cyclictest	2742243	-21	fschecks_time	10:25:24	0
2643506	99	53	35,16	cyclictest	2646061	-21	latency_hist	07:20:00	0
2643508	99	52	45,5	cyclictest	2663358	-21	fschecks_time	08:25:20	1
2643508	99	52	45,4	cyclictest	0	-21	swapper/1	10:05:39	1
2643508	99	51	43,6	cyclictest	2751298	-21	ntp_kernel_err	10:35:23	1
2643508	99	51	41,8	cyclictest	317	-21	systemd-journal	09:43:34	1
2643506	99	51	43,6	cyclictest	2788407	-21	kworker/u4:8+events_unbound	11:40:47	0
2643506	99	51	42,6	cyclictest	2840512	-21	/usr/sbin/munin	12:15:42	0
2643508	99	50	41,5	cyclictest	2847919	-21	latency_hist	12:25:02	1
2643508	99	50	41,5	cyclictest	2830729	-21	fschecks_count	12:05:20	1
2643508	99	50	40,8	cyclictest	2779404	-21	ssh	11:06:59	1
2643506	99	50	43,5	cyclictest	2858001	-21	/usr/sbin/munin	12:35:38	0
2643506	99	50	43,5	cyclictest	2782612	-21	proc_pri	11:10:37	0
2643508	99	49	5,36	cyclictest	2689161	-21	ssh	09:25:38	1
2643508	99	49	38,8	cyclictest	2674334	-21	diskmemload	11:46:05	1
2643508	99	49	38,6	cyclictest	2760316	-21	ntpq	10:45:32	1
2643508	99	49	19,17	cyclictest	0	-21	swapper/1	12:00:17	1
2643508	99	49	15,20	cyclictest	0	-21	swapper/1	11:10:36	1
2643506	99	49	42,5	cyclictest	2704004	-21	kworker/u4:8+events_unbound	09:45:00	0
2643506	99	49	41,6	cyclictest	2730519	-21	kworker/u4:5+events_unbound	10:18:37	0
2643506	99	49	40,7	cyclictest	2684136	-21	gltestperf	09:20:21	0
2643506	99	49	39,7	cyclictest	0	-21	swapper/0	11:52:48	0
2643508	99	48	41,5	cyclictest	2764406	-21	grep	10:50:19	1
2643508	99	48	41,5	cyclictest	2729469	-21	sendmail_mailqu	10:10:38	1
2643508	99	48	40,6	cyclictest	2755743	-21	diskmemload	10:40:25	1
2643506	99	48	40,6	cyclictest	2759188	-21	cron	10:45:01	0
2643506	99	48	40,6	cyclictest	0	-21	swapper/0	08:40:00	0
2643506	99	48	39,7	cyclictest	2804823	-21	sendmail_mailqu	11:35:39	0
2643506	99	48	30,16	cyclictest	2763641	-21	cron	10:49:59	0
2643508	99	47	41,4	cyclictest	2795352	-21	fschecks_count	11:25:23	1
2643508	99	47	37,7	cyclictest	0	-21	swapper/1	09:55:28	1
2643508	99	47	36,9	cyclictest	2799381	-21	sh	11:30:13	1
2643506	99	47	41,4	cyclictest	15	1	ktimers/0	09:45:37	0
2643506	99	47	39,6	cyclictest	378	-21	dbus-daemon	10:33:38	0
2643506	99	47	35,10	cyclictest	53	-21	kswapd0	10:00:33	0
2643506	99	47	34,8	cyclictest	2647337	-21	modprobe	07:25:01	0
2643508	99	46	39,5	cyclictest	2773449	-21	sshd	11:00:23	1
2643508	99	46	39,5	cyclictest	2658751	-21	timerandwakeup	08:05:37	1
2643508	99	46	38,6	cyclictest	0	-21	swapper/1	11:38:50	1
2643508	99	46	38,5	cyclictest	2746592	-21	tune2fs	10:30:19	1
2643508	99	46	38,5	cyclictest	2662087	-21	fschecks_time	08:20:19	1
2643508	99	46	37,6	cyclictest	2661506	-21	kworker/u4:6-rpciod	08:30:19	1
2643508	99	46	37,6	cyclictest	0	-21	swapper/1	12:25:23	1
2643508	99	46	2,32	cyclictest	2853454	-21	ntp_states	12:30:37	1
2643506	99	46	39,5	cyclictest	2786772	-21	ssh	11:15:26	0
2643506	99	46	39,5	cyclictest	2655129	-21	kworker/u4:16+events_unbound	08:28:21	0
2643506	99	46	36,7	cyclictest	2814790	-21	kworker/u4:4+events_unbound	11:55:36	0
2643506	99	46	36,7	cyclictest	2814790	-21	kworker/u4:4+events_unbound	11:55:35	0
2643508	99	45	39,4	cyclictest	2659906	-21	sendmail_mailqu	08:10:35	1
2643508	99	45	13,19	cyclictest	0	-21	swapper/1	09:30:29	1
2643506	99	45	38,5	cyclictest	2671690	-21	unixbench_singl	08:55:38	0
2643506	99	45	38,5	cyclictest	2659479	-21	fschecks_time	08:10:18	0
2643506	99	45	37,6	cyclictest	2737821	-21	gltestperf	10:20:21	0
2643506	99	45	37,5	cyclictest	2848915	-21	/usr/sbin/munin	12:25:31	0
2643506	99	45	37,5	cyclictest	2672849	-21	timerwakeupswit	09:00:37	0
2643506	99	45	37,5	cyclictest	2656462	-21	sendmail	08:00:00	0
2643506	99	45	25,17	cyclictest	0	-21	swapper/0	09:30:25	0
2643506	99	45	22,20	cyclictest	2662067	-21	fschecks_time	08:20:20	0
2643508	99	44	38,4	cyclictest	2719741	-21	aten_r7power_po	10:00:18	1
2643508	99	44	36,5	cyclictest	2674334	-21	diskmemload	09:35:13	1
2643508	99	44	35,7	cyclictest	2644843	-21	latency_hist	07:15:01	1
2643508	99	44	35,6	cyclictest	2655682	-21	gltestperf	07:55:20	1
2643508	99	44	35,6	cyclictest	0	-21	swapper/1	10:55:38	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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