OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8
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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.

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 rackeslot4s.osadl.org (updated Sat Jul 18, 2026 00:44:06)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2677243	99	44	37,5	cyclictest	2733930	-21	latency_hist	20:05:00	0
2677243	99	38	33,4	cyclictest	335557	-21	systemd-journal	19:30:00	0
2677245	99	37	33,3	cyclictest	2972921	-21	kworker/u8:1+flush-259:0	00:05:24	1
2677243	99	37	31,4	cyclictest	2801679	-21	apt-get	21:10:12	0
2677245	99	36	32,2	cyclictest	2832412	-21	kworker/u8:3+flush-259:0	22:00:25	1
2677248	99	34	28,4	cyclictest	2708115	-21	latency_hist	19:40:01	2
2677245	99	32	26,4	cyclictest	335557	-21	systemd-journal	23:08:30	1
2677253	99	31	24,5	cyclictest	335557	-21	systemd-journal	20:10:00	3
2677245	99	31	27,2	cyclictest	2863634	-21	kworker/u8:2+flush-259:0	22:55:26	1
2677253	99	30	27,2	cyclictest	2764912	-21	kworker/u8:0+flush-259:0	20:40:00	3
2677248	99	30	26,3	cyclictest	335557	-21	systemd-journal	21:15:30	2
2677245	99	30	26,3	cyclictest	2972921	-21	kworker/u8:1+events_unbound	00:20:16	1
2677253	99	29	25,3	cyclictest	2915442	-21	kworker/u8:1+events_unbound	23:30:24	3
2677248	99	29	26,2	cyclictest	2667006	-21	kworker/u8:1+flush-259:0	19:20:23	2
2677248	99	29	25,3	cyclictest	335557	-21	systemd-journal	00:10:00	2
2677245	99	29	26,2	cyclictest	2951812	-21	kworker/u8:2+flush-259:0	23:55:21	1
2677245	99	29	26,2	cyclictest	2951812	-21	kworker/u8:2+flush-259:0	00:00:29	1
2677245	99	29	25,3	cyclictest	2827166	-21	kworker/u8:2+events_unbound	21:40:22	1
2677245	99	29	24,4	cyclictest	2703209	-21	apt-get	19:35:11	1
2677253	99	28	25,2	cyclictest	2780774	-21	kworker/u8:2+events_unbound	21:05:18	3
2677253	99	28	24,3	cyclictest	2837805	-21	apt-get	21:45:12	3
2677245	99	28	23,3	cyclictest	2718457	-21	kworker/u8:1+events_unbound	21:20:22	1
2677245	99	27	24,2	cyclictest	2733551	-21	kworker/u8:0+flush-259:0	20:10:09	1
2677245	99	27	23,3	cyclictest	2796211	-21	kworker/u8:0+events_unbound	22:08:31	1
2677245	99	27	20,5	cyclictest	2748560	-21	ntpq	20:15:22	1
2677243	99	27	21,4	cyclictest	2992713	-21	ntpq	00:10:20	0
2677253	99	26	23,2	cyclictest	3014151	-21	kworker/u8:3+flush-259:0	00:35:16	3
2677253	99	26	23,2	cyclictest	2832412	-21	kworker/u8:3+flush-259:0	22:15:01	3
2677253	99	26	22,2	cyclictest	2951812	-21	kworker/u8:2+events_unbound	23:40:00	3
2677248	99	26	23,2	cyclictest	2951812	-21	kworker/u8:2+flush-259:0	23:45:31	2
2677245	99	26	23,2	cyclictest	2676949	-21	kworker/u8:2+events_unbound	19:55:17	1
2677245	99	26	23,2	cyclictest	2676949	-21	kworker/u8:2+events_unbound	19:40:12	1
2677245	99	26	22,3	cyclictest	2926155	-21	kworker/u8:0+flush-259:0	23:15:22	1
2677245	99	26	21,3	cyclictest	2692681	-21	kworker/u8:3+flush-259:0	19:25:11	1
2677243	99	26	22,3	cyclictest	2848135	-21	apt-get	21:55:12	0
2677248	99	25	23,2	cyclictest	2983105	-21	kworker/u8:0+flush-259:0	00:05:00	2
2677248	99	25	22,2	cyclictest	2972921	-21	kworker/u8:1+flush-259:0	00:15:26	2
2677248	99	25	21,3	cyclictest	335557	-21	systemd-journal	19:50:31	2
2677245	99	25	21,3	cyclictest	2894694	-21	kworker/u8:0+flush-259:0	22:50:11	1
2677245	99	25	21,3	cyclictest	2667006	-21	kworker/u8:1+events_unbound	19:20:21	1
2677245	99	25	20,4	cyclictest	335557	-21	systemd-journal	23:40:00	1
2677245	99	25	17,5	cyclictest	2967274	-21	latency_hist	23:50:02	1
2677243	99	25	19,4	cyclictest	2749433	-21	latency_hist	20:20:01	0
2677243	99	25	18,5	cyclictest	2945767	-21	ntpq	23:25:23	0
2677248	99	24	20,3	cyclictest	2806592	-21	kworker/u8:3+flush-259:0	21:30:20	2
2677245	99	24	22,1	cyclictest	2692681	-21	kworker/u8:3+events_unbound	19:51:30	1
2677245	99	24	20,3	cyclictest	3014151	-21	kworker/u8:3+events_unbound	00:36:31	1
2677245	99	24	20,3	cyclictest	2796211	-21	kworker/u8:0+flush-259:0	22:11:56	1
2677245	99	24	20,3	cyclictest	2759693	-21	kworker/u8:2+events_unbound	20:32:32	1
2677245	99	24	20,3	cyclictest	2733551	-21	kworker/u8:0+flush-259:0	20:20:27	1
2677245	99	24	20,3	cyclictest	2733551	-21	kworker/u8:0+events_unbound	20:26:31	1
2677245	99	24	20,3	cyclictest	2676949	-21	kworker/u8:2+flush-259:0	19:30:11	1
2677245	99	24	17,5	cyclictest	335557	-21	systemd-journal	23:30:30	1
2677243	99	24	21,2	cyclictest	2936510	-21	kworker/u8:4+flush-259:0	23:35:21	0
2677243	99	24	20,3	cyclictest	2972921	-21	kworker/u8:1+flush-259:0	00:30:24	0
2677248	99	23	19,3	cyclictest	2915442	-21	kworker/u8:1+events_unbound	23:35:25	2
2677248	99	23	19,3	cyclictest	2863634	-21	kworker/u8:2+flush-259:0	22:20:18	2
2677248	99	23	19,3	cyclictest	2692681	-21	kworker/u8:3+events_unbound	19:26:26	2
2677245	99	23	19,3	cyclictest	2832412	-21	kworker/u8:3+events_unbound	21:56:31	1
2677245	99	23	18,4	cyclictest	2993896	-21	apt-get	00:15:13	1
2677243	99	23	18,4	cyclictest	335557	-21	systemd-journal	22:14:30	0
2677253	99	22	17,3	cyclictest	2682363	-21	latency_hist	19:15:01	3
2677248	99	22	16,4	cyclictest	2930199	-21	ntpq	23:10:21	2
2677248	99	22	16,4	cyclictest	2909513	-21	ntpq	22:50:20	2
2677248	99	22	15,5	cyclictest	2888444	-21	ntpq	22:30:20	2
2677248	99	22	12,9	cyclictest	2692681	-21	kworker/u8:3+flush-259:0	19:35:00	2
2677245	99	22	19,2	cyclictest	2920771	-21	kworker/u8:2+events_unbound	23:10:22	1
2677245	99	22	19,2	cyclictest	2832412	-21	kworker/u8:3+flush-259:0	22:25:22	1
2677245	99	22	19,2	cyclictest	2718457	-21	kworker/u8:1+events_unbound	20:45:22	1
2677245	99	22	19,2	cyclictest	2718457	-21	kworker/u8:1+events_unbound	20:45:21	1
2677245	99	22	18,3	cyclictest	2863634	-21	kworker/u8:2+events_unbound	22:21:31	1
2677245	99	22	17,3	cyclictest	2676949	-21	kworker/u8:2+flush-259:0	19:10:21	1
2677253	99	21	18,2	cyclictest	2920771	-21	kworker/u8:2+flush-259:0	23:05:16	3
2677253	99	21	18,2	cyclictest	2879183	-21	kworker/u8:1+flush-259:0	22:37:01	3
2677248	99	21	18,2	cyclictest	2915442	-21	kworker/u8:1+flush-259:0	23:40:20	2
2677248	99	21	18,2	cyclictest	2780774	-21	kworker/u8:2+flush-259:0	20:57:30	2
2677248	99	21	17,3	cyclictest	2993636	-21	latency_hist	00:15:01	2
2677248	99	21	17,3	cyclictest	2967251	-21	kworker/u8:3+flush-259:0	23:53:00	2
2677248	99	21	17,3	cyclictest	2796211	-21	kworker/u8:0+flush-259:0	21:55:22	2
2677245	99	21	18,2	cyclictest	2775618	-21	cron	20:45:00	1
2677245	99	21	17,3	cyclictest	2936510	-21	kworker/u8:4+flush-259:0	23:20:21	1
2677245	99	21	17,3	cyclictest	2915442	-21	kworker/u8:1+events_unbound	23:02:05	1
2677245	99	21	17,3	cyclictest	2791348	-21	apt-get	21:00:11	1
2677245	99	21	16,4	cyclictest	2967964	-21	apt-get	23:50:12	1
2677245	99	21	15,4	cyclictest	2900350	-21	apt-get	22:45:11	1
2677253	99	20	17,2	cyclictest	2832412	-21	kworker/u8:3+flush-259:0	22:05:15	3
2677253	99	20	15,3	cyclictest	2899864	-21	gpgv	22:45:01	3
2677248	99	20	17,2	cyclictest	2920771	-21	kworker/u8:2+events_unbound	23:09:33	2
2677248	99	20	17,2	cyclictest	2718457	-21	kworker/u8:1+events_unbound	21:12:33	2
2677248	99	20	17,2	cyclictest	2676949	-21	kworker/u8:2+events_unbound	19:55:22	2
2677248	99	20	16,3	cyclictest	335557	-21	systemd-journal	23:27:07	2
2677248	99	20	16,3	cyclictest	2894694	-21	kworker/u8:0+flush-259:0	22:45:24	2
2677248	99	20	16,3	cyclictest	2780774	-21	kworker/u8:2+flush-259:0	21:05:17	2
2677248	99	20	16,3	cyclictest	2718457	-21	kworker/u8:1+events_unbound	20:29:59	2
2677248	99	20	13,5	cyclictest	3013480	-21	ntpq	00:30:21	2
2677245	99	20	16,3	cyclictest	2972921	-21	kworker/u8:1+events_unbound	00:30:14	1
2677245	99	20	16,3	cyclictest	2951812	-21	kworker/u8:2+events_unbound	23:42:28	1
2677245	99	20	16,3	cyclictest	2879183	-21	kworker/u8:1+events_unbound	22:35:14	1
2677245	99	20	16,3	cyclictest	2718457	-21	kworker/u8:1+events_unbound	20:36:37	1
2677245	99	20	16,3	cyclictest	2676949	-21	kworker/u8:2+flush-259:0	20:00:16	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2021-09-01 - 00:34