OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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
Special All - All RT - Optimization - Ethernet - Thumbnails - Next

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, lowest P state: ondemand
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack5slot4s.osadl.org (updated Sat Apr 25, 2026 12:44:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1953502	2	79	0,4	sleep0	0	-21	swapper/0	07:16:30	0
1943484	99	72	62,7	cyclictest	280	-21	systemd-journal	08:00:00	2
1943480	99	70	62,6	cyclictest	1980173	-21	kworker/u8:3+flush-8:0	08:41:18	1
1943480	99	66	60,5	cyclictest	2198679	-21	kworker/u8:0+flush-8:0	12:11:23	1
1943480	99	65	57,6	cyclictest	2198679	-21	kworker/u8:0+flush-8:0	12:31:19	1
1943480	99	63	58,4	cyclictest	2153586	-21	kworker/u8:3+flush-8:0	10:46:24	1
1943480	99	63	58,4	cyclictest	1900093	-21	kworker/u8:2+events_unbound	07:21:24	1
1943480	99	62	56,5	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	08:36:19	1
1943480	99	61	55,4	cyclictest	1801761	-21	kworker/u8:1+events_unbound	10:06:11	1
1943480	99	61	54,6	cyclictest	2084390	-21	kworker/u8:3+events_unbound	10:01:23	1
1943480	99	59	52,6	cyclictest	2183181	-21	kworker/u8:2+flush-8:0	11:11:20	1
1943480	99	58	54,3	cyclictest	1801761	-21	kworker/u8:1+events_unbound	08:01:21	1
1943480	99	57	51,5	cyclictest	2198679	-21	kworker/u8:0+flush-8:0	11:36:19	1
1943475	99	57	48,6	cyclictest	2193500	-21	latency_hist	11:20:01	0
1943480	99	56	50,5	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	08:51:26	1
1943480	99	56	49,5	cyclictest	1801761	-21	kworker/u8:1+events_unbound	07:36:19	1
1943480	99	56	48,6	cyclictest	2153586	-21	kworker/u8:3+flush-8:0	11:21:21	1
1943475	99	56	45,8	cyclictest	2149533	-21	diskstats	10:36:10	0
1943480	99	55	50,4	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	08:26:12	1
1943480	99	55	49,5	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	09:41:24	1
1943480	99	55	49,4	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	09:01:22	1
1943480	99	54	48,4	cyclictest	1980173	-21	kworker/u8:3+events_unbound	08:31:20	1
1943484	99	53	47,4	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	09:56:26	2
1943480	99	53	46,5	cyclictest	2183181	-21	kworker/u8:2+flush-8:0	11:26:26	1
1943475	99	53	5,46	cyclictest	1	-21	systemd	11:10:00	0
1943475	99	53	44,7	cyclictest	2108053	-21	ntpq	09:51:18	0
1943475	99	53	43,7	cyclictest	2019709	-21	latency_hist	08:25:00	0
1943484	99	52	47,3	cyclictest	1980173	-21	kworker/u8:3+flush-8:0	08:06:23	2
1943480	99	52	48,3	cyclictest	2183181	-21	kworker/u8:2+events_unbound	11:31:09	1
1943480	99	52	48,3	cyclictest	1980173	-21	kworker/u8:3+flush-8:0	08:06:25	1
1943480	99	52	47,4	cyclictest	2044634	-21	kworker/u8:2+events_unbound	09:46:20	1
1943480	99	52	47,4	cyclictest	1980173	-21	kworker/u8:3+flush-8:0	08:46:20	1
1943480	99	52	47,4	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	07:46:20	1
1943480	99	52	46,4	cyclictest	2198679	-21	kworker/u8:0+events_unbound	12:26:08	1
1943480	99	52	45,6	cyclictest	2138798	-21	kworker/u8:1+flush-8:0	10:36:21	1
1943480	99	52	45,5	cyclictest	2153586	-21	kworker/u8:3+flush-8:0	10:56:20	1
1943480	99	52	45,5	cyclictest	1801761	-21	kworker/u8:1+events_unbound	08:11:19	1
1943480	99	52	45,5	cyclictest	1801761	-21	kworker/u8:1+events_unbound	08:11:19	1
1943480	99	52	44,6	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	07:51:22	1
1943480	99	51	47,3	cyclictest	2044634	-21	kworker/u8:2+events_unbound	09:36:24	1
1943480	99	51	46,4	cyclictest	1801761	-21	kworker/u8:1+events_unbound	07:16:23	1
1943480	99	51	45,5	cyclictest	1900093	-21	kworker/u8:2+flush-8:0	08:21:09	1
1943475	99	51	42,7	cyclictest	280	-21	systemd-journal	08:45:01	0
2239391	2	50	0,2	sleep3	48	1	ktimers/3	12:06:09	3
1943480	99	50	44,5	cyclictest	2173406	-21	kworker/u8:1+flush-8:0	11:01:19	1
1943480	99	49	42,5	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	09:16:19	1
1943480	99	49	41,6	cyclictest	2084390	-21	kworker/u8:3+flush-8:0	10:11:17	1
1943480	99	49	41,6	cyclictest	2084390	-21	kworker/u8:3+flush-8:0	10:11:17	1
1943480	99	48	42,4	cyclictest	2153586	-21	kworker/u8:3+flush-8:0	11:16:19	1
1943480	99	48	40,6	cyclictest	2123372	-21	kworker/u8:0+flush-8:0	10:31:21	1
1943475	99	48	38,8	cyclictest	2144341	-21	diskstats	10:31:09	0
1943480	99	47	42,3	cyclictest	2198679	-21	kworker/u8:0+events_unbound	11:41:22	1
1943480	99	47	40,5	cyclictest	2138798	-21	kworker/u8:1+flush-8:0	10:41:13	1
1943480	99	47	37,7	cyclictest	280	-21	systemd-journal	08:20:00	1
1943480	99	47	37,7	cyclictest	280	-21	systemd-journal	08:20:00	1
1943480	99	47	33,10	cyclictest	280	-21	systemd-journal	11:55:00	1
1943484	99	46	40,4	cyclictest	1900093	-21	kworker/u8:2+flush-8:0	07:36:10	2
1943480	99	45	41,3	cyclictest	1980173	-21	kworker/u8:3+events_unbound	07:56:20	1
1943480	99	45	40,3	cyclictest	2223604	-21	kworker/u8:3+events_unbound	12:21:23	1
1943480	99	45	38,5	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	10:21:11	1
1943480	99	44	37,5	cyclictest	2223604	-21	kworker/u8:3+flush-8:0	11:56:11	1
1943480	99	44	37,5	cyclictest	2198679	-21	kworker/u8:0+events_unbound	11:46:19	1
1943475	99	44	39,4	cyclictest	2044634	-21	kworker/u8:2+events_unbound	09:26:25	0
1943475	99	44	38,4	cyclictest	2223604	-21	kworker/u8:3+events_unbound	12:05:00	0
1943475	99	44	36,6	cyclictest	1970545	-21	/usr/sbin/munin	07:36:17	0
1943480	99	43	38,3	cyclictest	2198679	-21	kworker/u8:0+flush-8:0	12:06:19	1
1943480	99	43	37,5	cyclictest	2044634	-21	kworker/u8:2+events_unbound	09:06:09	1
1943480	99	43	37,4	cyclictest	1900093	-21	kworker/u8:2+events_unbound	07:26:15	1
1943480	99	43	36,5	cyclictest	2223604	-21	kworker/u8:3+events_unbound	12:01:18	1
1943475	99	43	37,4	cyclictest	2018932	-21	kworker/u8:0+flush-8:0	08:51:10	0
1943475	99	43	32,8	cyclictest	2228340	-21	apt-get	11:55:00	0
1943480	99	42	36,4	cyclictest	2173406	-21	kworker/u8:1+events_unbound	12:16:08	1
1943480	99	42	36,4	cyclictest	1102287	-21	kworker/u8:4+events_unbound	07:11:19	1
1943480	99	42	34,6	cyclictest	2123372	-21	kworker/u8:0+flush-8:0	10:16:18	1
2078708	2	41	0,6	sleep3	0	-21	swapper/3	09:21:25	3
1943480	99	41	36,3	cyclictest	2173406	-21	kworker/u8:1+events_unbound	12:36:12	1
1943480	99	41	35,4	cyclictest	2044634	-21	kworker/u8:2+events_unbound	09:31:14	1
1943480	99	41	35,4	cyclictest	2018932	-21	kworker/u8:0+flush-8:0	09:26:13	1
1943480	99	41	31,8	cyclictest	2108020	-21	ntpq	09:51:17	1
1943475	99	40	32,7	cyclictest	2044634	-21	kworker/u8:2+flush-8:0	10:51:23	0
1943475	99	40	31,6	cyclictest	2173406	-21	kworker/u8:1+flush-8:0	12:16:05	0
1943480	99	39	34,3	cyclictest	2173406	-21	kworker/u8:1+events_unbound	11:06:15	1
1943480	99	39	33,5	cyclictest	2153586	-21	kworker/u8:3+events_unbound	10:51:20	1
1943475	99	39	33,4	cyclictest	2138798	-21	kworker/u8:1+flush-8:0	10:41:22	0
1943475	99	39	29,8	cyclictest	2254066	-21	diskstats	12:21:09	0
1943484	99	38	30,6	cyclictest	280	-21	systemd-journal	11:00:34	2
1943484	99	38	28,8	cyclictest	2228340	-21	apt-get	11:54:59	2
1943480	99	38	32,4	cyclictest	2018932	-21	kworker/u8:0+flush-8:0	08:56:15	1
1943199	2	38	23,10	sleep1	0	-21	swapper/1	07:08:49	1
1943480	99	37	33,3	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	07:31:24	1
1943480	99	37	32,4	cyclictest	2018932	-21	kworker/u8:0+events_unbound	09:21:14	1
1943480	99	37	32,4	cyclictest	1801761	-21	kworker/u8:1+flush-8:0	07:41:21	1
1943475	99	37	31,4	cyclictest	2198679	-21	kworker/u8:0+flush-8:0	12:31:24	0
1943475	99	37	31,4	cyclictest	2173406	-21	kworker/u8:1+events_unbound	11:31:23	0
1943475	99	37	30,5	cyclictest	2018932	-21	kworker/u8:0+events_unbound	08:56:20	0
1943475	99	37	29,6	cyclictest	2268572	-21	/usr/sbin/munin	12:36:21	0
1943290	2	37	2,10	sleep0	1943340	-21	munin-run	07:10:01	0
1943484	99	36	31,3	cyclictest	1102287	-21	kworker/u8:4+events_unbound	07:11:25	2
1943475	99	36	30,4	cyclictest	1801761	-21	kworker/u8:1+events_unbound	07:51:26	0
1943475	99	35	30,4	cyclictest	1980173	-21	kworker/u8:3+flush-8:0	08:46:23	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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