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

Characteristics of the 50 highest latencies:

System rack5slot4s.osadl.org (updated Sat Jun 13, 2026 12:44:18)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
597000	2	196	0,3	sleep3	75	-21	kworker/3:1-events	10:35:32	3
390757	99	71	65,4	cyclictest	705116	-21	kworker/u8:0+events_unbound	12:25:45	1
390757	99	71	65,4	cyclictest	705116	-21	kworker/u8:0+events_unbound	12:25:44	1
390757	99	71	64,4	cyclictest	546176	-21	kworker/u8:2+flush-8:0	11:00:46	1
390755	99	66	53,10	cyclictest	676296	-21	diskstats	11:55:29	0
395112	2	63	0,7	sleep3	0	-21	swapper/3	07:10:47	3
390757	99	63	56,5	cyclictest	660595	-21	kworker/u8:3+events_unbound	12:00:32	1
390757	99	63	53,7	cyclictest	482091	-21	/usr/sbin/munin	08:40:45	1
390757	99	62	58,3	cyclictest	546187	-21	kworker/u8:4+events_unbound	09:45:46	1
390757	99	61	55,4	cyclictest	546176	-21	kworker/u8:2+events_unbound	10:55:31	1
390755	99	60	51,6	cyclictest	427383	-21	latency_hist	07:45:00	0
390757	99	59	55,3	cyclictest	417095	-21	kworker/u8:3+flush-8:0	08:05:31	1
390757	99	59	54,3	cyclictest	457054	-21	kworker/u8:0+events_unbound	09:15:44	1
390757	99	59	53,4	cyclictest	556107	-21	kworker/u8:1+events_unbound	10:10:01	1
390757	99	59	52,5	cyclictest	457054	-21	kworker/u8:0+flush-8:0	09:50:41	1
390757	99	59	51,6	cyclictest	586351	-21	kworker/u8:1+events_unbound	10:30:43	1
390757	99	59	50,6	cyclictest	670859	-21	latency_hist	11:50:01	1
390757	99	59	50,6	cyclictest	1704890	-21	systemd-journal	09:45:00	1
390761	99	58	48,8	cyclictest	601155	-21	cp	10:40:00	2
390757	99	58	54,3	cyclictest	586351	-21	kworker/u8:1+events_unbound	10:35:38	1
390757	99	58	53,4	cyclictest	338991	-21	kworker/u8:2+flush-8:0	07:25:44	1
390757	99	57	51,4	cyclictest	546176	-21	kworker/u8:2+flush-8:0	10:20:41	1
390414	2	57	6,19	sleep1	0	-21	swapper/1	07:07:40	1
390757	99	56	48,6	cyclictest	487045	-21	kworker/u8:2+events_unbound	09:00:32	1
390757	99	56	48,6	cyclictest	487045	-21	kworker/u8:2+events_unbound	09:00:31	1
390757	99	55	51,3	cyclictest	660595	-21	kworker/u8:3+flush-8:0	11:50:48	1
390757	99	55	50,4	cyclictest	457054	-21	kworker/u8:0+events_unbound	08:35:30	1
390757	99	55	49,5	cyclictest	546187	-21	kworker/u8:4+events_unbound	10:45:30	1
390757	99	55	49,5	cyclictest	546176	-21	kworker/u8:2+flush-8:0	11:10:41	1
390757	99	55	49,4	cyclictest	635871	-21	kworker/u8:1+events_unbound	11:30:40	1
390757	99	54	45,7	cyclictest	401703	-21	ntpq	07:15:42	1
390757	99	53	46,5	cyclictest	556107	-21	kworker/u8:1+events_unbound	09:55:28	1
390757	99	53	45,6	cyclictest	490930	-21	ntpq	08:45:43	1
390757	99	52	46,5	cyclictest	526916	-21	kworker/u8:1+events_unbound	09:25:41	1
390757	99	52	46,5	cyclictest	3749718	-21	kworker/u8:4+events_unbound	07:10:30	1
390757	99	52	45,5	cyclictest	338991	-21	kworker/u8:2+events_unbound	07:55:40	1
390755	99	51	45,4	cyclictest	546187	-21	kworker/u8:4+events_unbound	10:00:45	0
390755	99	51	45,4	cyclictest	417095	-21	kworker/u8:3+flush-8:0	08:05:33	0
390755	99	51	44,5	cyclictest	591378	-21	apt-get	10:30:27	0
390755	99	51	39,9	cyclictest	636733	-21	diskstats	11:15:31	0
567709	2	50	0,2	chrt	48	1	ktimers/3	10:05:35	3
390757	99	50	45,4	cyclictest	338991	-21	kworker/u8:2+events_unbound	08:10:48	1
390757	99	50	41,6	cyclictest	1704890	-21	systemd-journal	09:05:49	1
390757	99	50	41,4	cyclictest	363011	-21	kworker/u8:1+events_unbound	07:40:45	1
390755	99	50	46,3	cyclictest	457054	-21	kworker/u8:0+events_unbound	09:50:47	0
390755	99	50	41,7	cyclictest	694636	-21	ntpq	12:10:40	0
390755	99	50	41,7	cyclictest	694636	-21	ntpq	12:10:40	0
390757	99	49	46,2	cyclictest	417095	-21	kworker/u8:3+flush-8:0	08:30:44	1
390757	99	49	43,5	cyclictest	457054	-21	kworker/u8:0+events_unbound	08:20:41	1
390757	99	48	43,4	cyclictest	417095	-21	kworker/u8:3+events_unbound	08:25:32	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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