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 376 highest latencies:

System rack7slot2.osadl.org (updated Tue Jan 20, 2026 12:44:11)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2449368	99	96	89,5	cyclictest	2456886	-21	kworker/u4:4+events_unbound	07:39:59	0
2449368	99	90	83,5	cyclictest	2445630	-21	kworker/u4:2+events_unbound	08:15:11	0
2449368	99	78	71,5	cyclictest	2456887	-21	kworker/u4:6+events_unbound	07:50:03	0
2449368	99	75	68,5	cyclictest	2445629	-21	kworker/u4:0+events_unbound	08:00:06	0
2449368	99	73	65,6	cyclictest	2599722	-21	ntp_states	11:30:41	0
2449369	99	72	64,5	cyclictest	2490670	-21	kworker/u4:14+events_unbound	09:30:20	1
2449368	99	69	62,5	cyclictest	2464552	-21	kworker/u4:5+events_unbound	08:25:11	0
2449368	99	68	60,6	cyclictest	2464553	-21	kworker/u4:10+events_unbound	08:30:10	0
2449369	99	67	58,6	cyclictest	2477249	-21	kworker/u4:8+events_unbound	09:40:22	1
2449368	99	67	59,5	cyclictest	2546094	-21	kworker/u4:14+events_unbound	10:49:59	0
2449368	99	66	59,5	cyclictest	2445629	-21	kworker/u4:0+events_unbound	07:19:57	0
2449368	99	65	58,5	cyclictest	2390888	-21	kworker/u4:1+events_unbound	07:34:59	0
2449368	99	64	49,7	cyclictest	2588453	-21	kworker/u4:4+events_unbound	11:37:45	0
2449369	99	63	46,12	cyclictest	0	-21	swapper/1	12:30:31	1
2449368	99	62	54,6	cyclictest	2505470	-21	latency_hist	09:40:02	0
2449368	99	61	46,6	cyclictest	2579823	-21	kworker/u4:6+events_unbound	11:12:01	0
2449368	99	60	46,5	cyclictest	2613637	-21	kworker/u4:0+events_unbound	12:03:00	0
2449368	99	59	52,5	cyclictest	2445631	-21	kworker/u4:3+events_unbound	07:25:03	0
2449368	99	59	51,5	cyclictest	0	-21	swapper/0	11:27:01	0
2449368	99	59	42,6	cyclictest	2562655	-21	kworker/u4:8+events_unbound	10:57:00	0
2449369	99	58	48,7	cyclictest	2519083	-21	ssh	09:55:26	1
2449368	99	58	7,49	cyclictest	2565671	-21	ssh	10:50:29	0
2449368	99	58	48,8	cyclictest	2510433	-21	ssh	09:45:20	0
2449368	99	57	47,7	cyclictest	2647510	-21	kworker/u4:16-rpciod	12:35:15	0
2449368	99	57	47,7	cyclictest	2647510	-21	kworker/u4:16-rpciod	12:35:14	0
2449368	99	56	49,4	cyclictest	2547740	-21	ssh	10:30:00	0
2449368	99	56	47,7	cyclictest	2449366	-21	cyclictest	12:06:08	0
2449368	99	56	45,8	cyclictest	0	-21	swapper/0	10:05:24	0
2449368	99	55	48,5	cyclictest	2643199	-21	kworker/u4:8+events_unbound	12:22:00	0
2449368	99	55	46,6	cyclictest	2637354	-21	fschecks_count	12:15:19	0
2449368	99	55	38,15	cyclictest	2464553	-21	kworker/u4:10+events_unbound	09:15:02	0
2449369	99	54	47,5	cyclictest	2584141	-21	kworker/u4:1+events_unbound	11:30:42	1
2449368	99	54	34,5	cyclictest	2615496	-21	munin-plugin-st	11:50:00	0
2449369	99	53	46,5	cyclictest	2587257	-21	ssh	11:15:38	1
2449369	99	53	42,6	cyclictest	0	-21	swapper/1	10:33:53	1
2449369	99	53	42,6	cyclictest	0	-21	swapper/1	10:33:53	1
2449369	99	53	21,18	cyclictest	0	-21	swapper/1	11:25:41	1
2449368	99	53	47,4	cyclictest	2494980	-21	kworker/u4:2+events_unbound	09:29:00	0
2449368	99	53	41,9	cyclictest	2480109	-21	/usr/sbin/munin	09:10:12	0
2449369	99	52	45,5	cyclictest	2633242	-21	gltestperf	12:10:21	1
2449369	99	52	45,5	cyclictest	2514539	-21	grep	09:50:21	1
2449369	99	52	42,7	cyclictest	2453122	-21	kworker/u4:14+events_unbound	07:35:00	1
2449368	99	52	45,5	cyclictest	2497444	-21	diskstats	09:30:18	0
2449368	99	52	44,6	cyclictest	2476221	-21	aten2__	08:55:17	0
2449368	99	52	32,13	cyclictest	54	-21	kswapd0	12:25:12	0
2449368	99	52	11,26	cyclictest	2578391	-21	ssh	11:05:31	0
2449369	99	51	44,5	cyclictest	0	-21	swapper/1	11:55:17	1
2449369	99	51	44,5	cyclictest	0	-21	swapper/1	11:55:17	1
2449369	99	51	43,6	cyclictest	2584141	-21	kworker/u4:1+events_unbound	11:45:45	1
2449369	99	51	39,8	cyclictest	0	-21	swapper/1	11:05:32	1
2449369	99	51	39,6	cyclictest	0	-21	swapper/1	07:35:23	1
2449368	99	51	44,5	cyclictest	2620352	-21	fschecks_count	11:55:21	0
2449368	99	51	44,5	cyclictest	2620352	-21	fschecks_count	11:55:20	0
2449369	99	50	42,6	cyclictest	0	-21	swapper/1	09:05:15	1
2449369	99	50	39,6	cyclictest	0	-21	swapper/1	12:05:12	1
2449369	99	50	38,8	cyclictest	2472719	-21	grep	08:40:21	1
2449369	99	50	36,10	cyclictest	0	-21	swapper/1	12:15:25	1
2449369	99	50	27,15	cyclictest	2526590	-21	modprobe	10:05:01	1
2449368	99	50	43,5	cyclictest	2608275	-21	/usr/sbin/munin	11:40:35	0
2449368	99	50	43,5	cyclictest	2449366	-21	cyclictest	09:41:41	0
2449369	99	49	7,14	cyclictest	2481586	-21	ssh	09:10:53	1
2449369	99	49	40,6	cyclictest	2574166	-21	sshd	11:00:30	1
2449369	99	49	39,7	cyclictest	2641630	-21	fschecks_count	12:20:20	1
2449369	99	49	34,12	cyclictest	0	-21	swapper/1	08:25:29	1
2449369	99	49	31,12	cyclictest	2454399	-21	modprobe	07:30:00	1
2449369	99	49	2,38	cyclictest	2489378	-21	ssh	09:20:26	1
2449369	99	49	17,11	cyclictest	2557761	-21	/usr/sbin/munin	10:40:38	1
2449369	99	48	5,16	cyclictest	2618771	-21	ssh	11:53:27	1
2449369	99	48	5,16	cyclictest	2618771	-21	ssh	11:53:27	1
2449369	99	48	42,4	cyclictest	27	1	ktimers/1	10:11:53	1
2449369	99	48	40,5	cyclictest	0	-21	swapper/1	10:05:27	1
2449369	99	48	39,6	cyclictest	0	-21	swapper/1	12:25:30	1
2449369	99	48	38,8	cyclictest	2467516	-21	aten_r7power_vo	08:20:21	1
2449369	99	48	37,6	cyclictest	0	-21	swapper/1	09:15:16	1
2449369	99	48	31,13	cyclictest	0	-21	swapper/1	07:15:15	1
2449369	99	48	28,16	cyclictest	0	-21	swapper/1	11:20:25	1
2449368	99	48	41,5	cyclictest	2492683	-21	latency_hist	09:25:02	0
2449368	99	48	39,7	cyclictest	54	-21	kswapd0	11:00:18	0
2449368	99	48	26,14	cyclictest	2465387	-21	ntpq	08:10:29	0
2449369	99	47	41,4	cyclictest	27	1	ktimers/1	09:26:50	1
2449369	99	47	39,6	cyclictest	2536494	-21	/usr/sbin/munin	10:15:38	1
2449369	99	47	38,6	cyclictest	2460295	-21	sshd	07:50:30	1
2449369	99	47	37,8	cyclictest	2509969	-21	aten2__	09:45:15	1
2449369	99	47	37,7	cyclictest	2462065	-21	sendmail	08:00:00	1
2449369	99	47	34,9	cyclictest	0	-21	swapper/1	11:10:35	1
2449368	99	47	40,5	cyclictest	2390888	-21	kworker/u4:1+events_unbound	08:38:03	0
2449368	99	47	39,6	cyclictest	2452118	-21	aten_r7power_cu	07:20:13	0
2449368	99	47	38,7	cyclictest	2536080	-21	ntp_kernel_pll_	10:15:28	0
2449368	99	47	33,8	cyclictest	2592756	-21	kworker/u4:2+events_unbound	11:50:32	0
2449368	99	47	33,8	cyclictest	2592756	-21	kworker/u4:2+events_unbound	11:50:31	0
2449368	99	47	26,18	cyclictest	0	-21	swapper/0	10:40:28	0
2449368	99	47	16,23	cyclictest	17	1	rcu_preempt	10:30:41	0
2449368	99	47	16,23	cyclictest	17	1	rcu_preempt	10:30:40	0
2449369	99	46	8,13	cyclictest	2564301	-21	ssh	10:49:24	1
2449369	99	46	7,11	cyclictest	2568597	-21	ssh	10:54:34	1
2449369	99	46	38,5	cyclictest	2456886	-21	kworker/u4:4-rpciod	08:10:02	1
2449369	99	46	35,7	cyclictest	2473872	-21	sed	08:45:13	1
2449369	99	46	33,9	cyclictest	37	-21	kcompactd0	10:38:18	1
2449369	99	46	33,9	cyclictest	37	-21	kcompactd0	10:38:18	1
2449369	99	46	31,11	cyclictest	0	-21	swapper/1	08:30:40	1
2449368	99	46	39,5	cyclictest	2463837	-21	tune2fs	08:05:18	0
2449368	99	46	38,6	cyclictest	2523015	-21	fschecks_count	10:00:20	0
2449368	99	46	37,6	cyclictest	0	-21	swapper/0	09:50:21	0
2449368	99	46	36,7	cyclictest	2588453	-21	kworker/u4:4+rpciod	12:10:21	0
2449368	99	46	20,21	cyclictest	17	1	rcu_preempt	11:20:45	0
2449369	99	45	38,5	cyclictest	2502240	-21	ntpq	09:35:31	1
2449369	99	45	37,5	cyclictest	2539601	-21	diskmemload	10:20:12	1
2449369	99	45	35,7	cyclictest	2476004	-21	cron	08:55:00	1
2449369	99	45	28,14	cyclictest	2607867	-21	/usr/sbin/munin	11:40:21	1
2449369	99	45	27,15	cyclictest	0	-21	swapper/1	12:35:30	1
2449369	99	45	27,15	cyclictest	0	-21	swapper/1	12:35:29	1
2449369	99	45	12,7	cyclictest	28	-21	ksoftirqd/1	10:55:28	1
2449368	99	45	39,4	cyclictest	2552844	-21	uname	10:35:23	0
2449368	99	45	39,4	cyclictest	2552844	-21	uname	10:35:23	0
2449368	99	45	39,4	cyclictest	2474738	-21	kworker/u4:3+events_unbound	09:08:01	0
2449368	99	45	37,5	cyclictest	255	50	irq/23-42890000.ethernet	10:20:13	0
2449368	99	45	34,8	cyclictest	2586393	-21	/usr/sbin/munin	11:15:17	0
2449368	99	45	30,7	cyclictest	2464553	-21	kworker/u4:10+xprtiod	08:50:13	0
2449369	99	44	37,5	cyclictest	2624306	-21	aten2__	12:00:15	1
2449369	99	44	33,9	cyclictest	2603611	-21	if_eth0	11:35:24	1
2449369	99	44	30,11	cyclictest	0	-21	swapper/1	08:15:22	1
2449368	99	44	38,4	cyclictest	2535058	-21	munin-run	10:15:01	0
2449368	99	44	37,5	cyclictest	2650310	-21	/usr/sbin/munin	12:30:22	0
2449368	99	44	35,7	cyclictest	2519646	-21	unixbench_singl	09:55:40	0
2449369	99	43	5,15	cyclictest	2543784	-21	ssh	10:25:09	1
2449369	99	43	30,10	cyclictest	2478194	-21	awk	09:00:35	1
2449369	99	43	29,11	cyclictest	0	-21	swapper/1	08:00:19	1
2449368	99	43	36,5	cyclictest	2457940	-21	threads	07:40:37	0
2449368	99	43	36,4	cyclictest	0	-21	swapper/0	08:20:34	0
2449369	99	42	35,5	cyclictest	2449366	-21	cyclictest	08:10:28	1
2449369	99	42	33,5	cyclictest	0	-21	swapper/1	08:35:21	1
2449368	99	42	36,4	cyclictest	2450575	-21	kworker/u4:12+events_unbound	08:46:00	0
2449368	99	42	35,5	cyclictest	2472513	-21	aten_r7power_po	08:40:17	0
2449368	99	42	34,6	cyclictest	2462119	-21	latency_hist	08:00:01	0
2449369	99	41	32,7	cyclictest	2458712	-21	grep	07:45:23	1
2449369	99	41	29,9	cyclictest	0	-21	swapper/1	07:40:36	1
2449369	99	41	27,12	cyclictest	0	-21	swapper/1	07:10:39	1
2449368	99	41	35,4	cyclictest	2450398	-21	timerwakeupswit	07:10:39	0
2449368	99	41	22,16	cyclictest	0	-21	swapper/0	09:00:17	0
2449369	99	40	33,5	cyclictest	2448103	-21	kworker/u4:5+events_unbound	07:24:57	1
2449369	99	40	32,5	cyclictest	0	-21	swapper/1	08:55:20	1
2449368	99	38	32,4	cyclictest	0	-21	swapper/0	07:45:25	0
2449368	99	37	10,15	cyclictest	2449451	-21	cat	07:10:00	0
2449369	99	36	26,6	cyclictest	0	-21	swapper/1	07:10:01	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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