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 Mon Aug 17, 2026 00:44:09)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3512167	99	100	95,4	cyclictest	3528906	-21	kworker/u4:0+events_unbound	20:25:51	1
3512167	99	97	89,6	cyclictest	3514665	-21	kworker/u4:11+events_unbound	19:40:44	1
3512167	99	96	89,5	cyclictest	3541700	-21	kworker/u4:1+events_unbound	21:06:00	1
3512167	99	95	87,6	cyclictest	3530189	-21	kworker/u4:4+events_unbound	20:30:52	1
3512167	99	88	81,5	cyclictest	3514681	-21	kworker/u4:15+events_unbound	20:20:51	1
3512167	99	86	70,11	cyclictest	3701814	-21	kworker/u4:6+xprtiod	00:10:09	1
3512167	99	81	71,8	cyclictest	3652757	-21	kworker/u4:1+events_unbound	23:16:25	1
3512166	99	77	58,14	cyclictest	53	-21	kswapd0	00:05:11	0
3512167	99	72	1,55	cyclictest	3584225	-21	ssh	21:55:30	1
3512166	99	71	62,6	cyclictest	3661867	-21	kworker/u4:0+events_unbound	23:31:29	0
3512166	99	65	62,2	cyclictest	3539134	-21	kworker/u4:9+events_unbound	21:56:11	0
3512166	99	65	60,3	cyclictest	3626212	-21	kworker/u4:11+events_unbound	23:06:25	0
3512167	99	64	50,5	cyclictest	3723727	-21	kworker/u4:8+events_unbound	00:35:04	1
3512167	99	64	50,5	cyclictest	3723727	-21	kworker/u4:8+events_unbound	00:35:04	1
3512166	99	64	59,3	cyclictest	3550404	-21	kworker/u4:6+events_unbound	21:46:06	0
3512166	99	64	35,22	cyclictest	3532950	-21	apt-get	20:30:13	0
3512166	99	64	18,9	cyclictest	3722312	-21	ntpq	00:30:28	0
3512166	99	64	18,9	cyclictest	3593212	-21	ntpq	22:05:33	0
3512167	99	63	56,5	cyclictest	3518694	-21	kworker/u4:14+events_unbound	19:35:02	1
3512166	99	62	47,12	cyclictest	3619561	-21	fschecks_count	22:35:20	0
3512166	99	61	24,9	cyclictest	3717887	-21	ntpq	00:25:27	0
3512166	99	61	22,11	cyclictest	3678074	-21	ntpq	23:40:34	0
3512166	99	60	54,4	cyclictest	3539133	-21	kworker/u4:6+events_unbound	21:00:57	0
3512166	99	60	52,4	cyclictest	0	-21	swapper/0	19:30:11	0
3512166	99	60	40,16	cyclictest	3682529	-21	ssh	23:45:35	0
3512166	99	59	47,8	cyclictest	3637451	-21	fschecks_count	22:55:22	0
3512166	99	59	41,16	cyclictest	3516960	-21	ps	19:25:40	0
3512166	99	59	40,15	cyclictest	3579892	-21	ntpq	21:50:36	0
3512167	99	58	48,7	cyclictest	27	1	ktimers/1	23:12:02	1
3512166	99	58	41,12	cyclictest	3633431	-21	ntpq	22:50:31	0
3512166	99	58	38,16	cyclictest	3530984	-21	ntpq	20:20:27	0
3512166	99	58	38,14	cyclictest	3543350	-21	apt-get	21:10:17	0
3512166	99	58	38,14	cyclictest	3543350	-21	apt-get	21:10:17	0
3512166	99	58	17,25	cyclictest	3728016	-21	ssh	00:36:40	0
3512166	99	58	17,25	cyclictest	3728016	-21	ssh	00:36:40	0
3512167	99	57	45,8	cyclictest	3528895	-21	systemd	20:10:46	1
3512166	99	57	47,7	cyclictest	3715338	-21	kworker/u4:1+events_unbound	00:23:43	0
3512166	99	57	46,7	cyclictest	0	-21	swapper/0	22:20:43	0
3512166	99	57	40,13	cyclictest	3672767	-21	apt-get	23:35:17	0
3512166	99	57	39,12	cyclictest	3704173	-21	ssh	00:10:22	0
3512166	99	57	39,12	cyclictest	3518886	-21	apt-get	19:35:10	0
3512166	99	57	36,16	cyclictest	3528398	-21	ntpq	20:10:27	0
3512166	99	57	31,9	cyclictest	3668075	-21	sed	23:30:02	0
3512166	99	57	30,9	cyclictest	3628945	-21	ntpq	22:45:31	0
3512166	99	57	29,24	cyclictest	1073	-21	snmpd	22:15:36	0
3512166	99	57	17,8	cyclictest	3570062	-21	apt-get	21:40:11	0
3512167	99	56	49,5	cyclictest	3503385	-21	kworker/u4:3+events_unbound	19:15:03	1
3512167	99	56	45,9	cyclictest	3713914	-21	timerwakeupswit	00:20:42	1
3512166	99	56	48,6	cyclictest	3567203	-21	sshd	21:36:04	0
3512166	99	56	48,6	cyclictest	3567203	-21	sshd	21:36:04	0
3512166	99	56	43,8	cyclictest	3614781	-21	apt-get	22:30:14	0
3512166	99	56	41,11	cyclictest	3536112	-21	ntpq	20:40:29	0
3512166	99	56	39,14	cyclictest	3610330	-21	apt-get	22:25:13	0
3512166	99	56	39,12	cyclictest	3552247	-21	apt-get	21:20:12	0
3512166	99	56	34,6	cyclictest	3556733	-21	apt-get	21:25:15	0
3512166	99	56	22,10	cyclictest	3597646	-21	ntpq	22:10:30	0
3512166	99	56	21,10	cyclictest	3654933	-21	apt-get	23:15:14	0
3512166	99	56	20,12	cyclictest	3651121	-21	nfs_client	23:10:25	0
3512166	99	56	18,4	cyclictest	3561164	-21	apt-get	21:30:13	0
3512166	99	56	17,9	cyclictest	3538634	-21	ntpq	20:50:28	0
3512167	99	55	47,6	cyclictest	3571233	-21	timerwakeupswit	21:40:38	1
3512167	99	55	41,7	cyclictest	3683772	-21	kworker/u4:5+events_unbound	23:50:03	1
3512166	99	55	41,9	cyclictest	3525290	-21	apt-get	20:00:13	0
3512166	99	55	41,10	cyclictest	3512914	-21	ntpq	19:10:29	0
3512166	99	55	40,12	cyclictest	3548605	-21	ssh	21:15:35	0
3512166	99	55	38,12	cyclictest	3526560	-21	apt-get	20:05:12	0
3512166	99	55	38,12	cyclictest	3522012	-21	ntpq	19:45:27	0
3512166	99	55	37,14	cyclictest	3623696	-21	apt-get	22:40:10	0
3512166	99	55	33,18	cyclictest	3524608	-21	ntpq	19:55:30	0
3512166	99	55	29,9	cyclictest	3645875	-21	sed	23:05:02	0
3512167	99	54	47,5	cyclictest	3537860	-21	kworker/u4:11+events_unbound	20:55:00	1
3512167	99	54	47,5	cyclictest	3509663	-21	kworker/u4:4+events_unbound	19:10:04	1
3512166	99	54	46,6	cyclictest	3529659	-21	/usr/sbin/munin	20:15:26	0
3512166	99	54	37,12	cyclictest	3531680	-21	apt-get	20:25:13	0
3512166	99	54	34,14	cyclictest	3691321	-21	ssh	23:55:31	0
3512166	99	54	22,9	cyclictest	3707979	-21	apt-get	00:15:06	0
3512166	99	54	21,10	cyclictest	3515436	-21	ntpq	19:20:26	0
3512166	99	54	20,11	cyclictest	3695839	-21	ntp_states	00:00:36	0
3512166	99	54	20,11	cyclictest	3686095	-21	apt-get	23:50:17	0
3512166	99	54	14,22	cyclictest	0	-21	swapper/0	22:00:25	0
3512167	99	53	47,4	cyclictest	3638284	-21	/usr/sbin/munin	22:55:43	1
3512167	99	53	44,6	cyclictest	3659757	-21	fschecks_count	23:20:18	1
3512166	99	53	41,8	cyclictest	0	-21	swapper/0	23:20:10	0
3512166	99	53	36,14	cyclictest	3542539	-21	ntpq	21:05:32	0
3512166	99	53	35,14	cyclictest	3513589	-21	apt-get	19:15:10	0
3512166	99	53	20,10	cyclictest	3534755	-21	ntpq	20:35:24	0
3512166	99	53	19,10	cyclictest	3520817	-21	ntp_states	19:40:33	0
3512167	99	52	45,5	cyclictest	3576897	-21	kworker/u4:11+events_unbound	21:50:03	1
3512167	99	52	45,5	cyclictest	3537524	-21	sendmail_mailqu	20:45:37	1
3512167	99	52	43,5	cyclictest	27	1	ktimers/1	00:31:45	1
3512166	99	52	20,10	cyclictest	3539862	-21	ntpq	20:55:26	0
3512167	99	51	44,5	cyclictest	3628653	-21	gltestperf	22:45:21	1
3512167	99	51	44,4	cyclictest	0	-21	swapper/1	21:25:26	1
3512167	99	51	42,6	cyclictest	3551978	-21	sendmail	21:20:01	1
3512167	99	51	41,6	cyclictest	0	-21	swapper/1	22:05:29	1
3512167	99	51	10,37	cyclictest	3664632	-21	sh	23:25:31	1
3512166	99	51	36,10	cyclictest	3522721	-21	apt-get	19:50:12	0
3512166	99	51	17,12	cyclictest	3537330	-21	ntpq	20:45:26	0
3512167	99	50	43,5	cyclictest	3678519	-21	unixbench_singl	23:40:41	1
3512167	99	50	42,5	cyclictest	3652757	-21	kworker/u4:1+events_unbound	23:40:00	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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