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 50 highest latencies:

System rackeslot4s.osadl.org (updated Tue Jun 23, 2026 00:44:05)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2487947	99	55	52,2	cyclictest	2815642	-21	gpgv	00:25:00	0
2487953	99	54	50,3	cyclictest	2487906	-21	kworker/u8:3+flush-259:0	20:00:01	2
2487947	99	50	44,4	cyclictest	2581964	-21	latency_hist	20:40:00	0
2487958	99	48	41,5	cyclictest	2794880	-21	latency_hist	00:05:00	3
2487953	99	45	41,3	cyclictest	2638820	-21	kworker/u8:0+events_unbound	22:00:01	2
2487953	99	43	39,3	cyclictest	2546087	-21	kworker/u8:4+events_unbound	21:00:22	2
2487958	99	42	36,4	cyclictest	2722216	-21	awk	22:55:00	3
2487947	99	42	38,3	cyclictest	2670463	-21	apt-get	22:05:13	0
2487953	99	41	37,3	cyclictest	2676013	-21	kworker/u8:3+flush-259:0	22:25:01	2
2487953	99	41	37,3	cyclictest	2669899	-21	kworker/u8:1+events_unbound	23:20:21	2
2487953	99	41	34,5	cyclictest	335557	-21	systemd-journal	19:35:01	2
2487958	99	40	34,4	cyclictest	2763479	-21	latency_hist	23:35:00	3
2487953	99	40	36,3	cyclictest	2784592	-21	kworker/u8:2+events_unbound	00:05:23	2
2487953	99	40	36,2	cyclictest	2607380	-21	kworker/u8:0+events_unbound	21:05:22	2
2487953	99	40	33,2	cyclictest	2638820	-21	kworker/u8:0+events_unbound	22:05:23	2
2487953	99	38	35,2	cyclictest	2669899	-21	kworker/u8:1+flush-259:0	23:25:22	2
2487953	99	38	35,2	cyclictest	2644579	-21	kworker/u8:1+flush-259:0	21:40:21	2
2487953	99	38	30,3	cyclictest	2737721	-21	kworker/u8:0+events_unbound	23:30:23	2
2487950	99	38	31,5	cyclictest	335557	-21	systemd-journal	20:55:00	1
2487947	99	38	35,2	cyclictest	2669899	-21	kworker/u8:1+flush-259:0	23:00:01	0
2487953	99	37	34,2	cyclictest	2592490	-21	kworker/u8:1+events_unbound	21:15:21	2
2487953	99	37	33,3	cyclictest	2455714	-21	kworker/u8:2+flush-259:0	19:35:20	2
2487947	99	37	30,5	cyclictest	2504589	-21	diskstats	19:25:13	0
2487953	99	36	32,3	cyclictest	2669899	-21	kworker/u8:1+events_unbound	00:30:22	2
2487953	99	36	31,3	cyclictest	2566522	-21	kworker/u8:2+events_unbound	21:30:00	2
2487958	99	35	28,5	cyclictest	2815712	-21	cp	00:25:00	3
2487953	99	35	32,2	cyclictest	2638820	-21	kworker/u8:0+events_unbound	22:15:15	2
2487953	99	35	32,2	cyclictest	2566522	-21	kworker/u8:2+events_unbound	21:30:12	2
2487953	99	35	31,3	cyclictest	2566522	-21	kworker/u8:2+flush-259:0	20:45:00	2
2487950	99	35	28,5	cyclictest	2831453	-21	latency_hist	00:40:01	1
2487958	99	34	27,5	cyclictest	2643495	-21	ntpq	21:35:21	3
2487953	99	34	31,2	cyclictest	2638820	-21	kworker/u8:0+flush-259:0	21:50:19	2
2487953	99	34	30,3	cyclictest	2696659	-21	kworker/u8:0+events_unbound	22:30:12	2
2487953	99	34	29,4	cyclictest	2455714	-21	kworker/u8:2+events_unbound	19:10:11	2
2487947	99	34	27,5	cyclictest	2627537	-21	ntpq	21:20:20	0
2487953	99	33	30,2	cyclictest	2784592	-21	kworker/u8:2+flush-259:0	23:55:24	2
2487953	99	33	30,2	cyclictest	2582191	-21	kworker/u8:3+flush-259:0	20:50:23	2
2487953	99	33	30,2	cyclictest	2546087	-21	kworker/u8:4+flush-259:0	20:10:15	2
2487953	99	33	29,3	cyclictest	2566522	-21	kworker/u8:2+events_unbound	20:33:23	2
2487953	99	33	29,3	cyclictest	2540736	-21	kworker/u8:0+events_unbound	20:25:19	2
2487950	99	33	27,4	cyclictest	2566743	-21	/usr/sbin/munin	20:25:15	1
2487958	99	32	27,3	cyclictest	2493535	-21	cat	19:15:00	3
2487953	99	32	29,2	cyclictest	2623938	-21	kworker/u8:4+events_unbound	21:20:21	2
2487953	99	32	28,3	cyclictest	2768872	-21	kworker/u8:4+flush-259:0	00:25:25	2
2487953	99	32	28,3	cyclictest	2768872	-21	kworker/u8:4+flush-259:0	00:20:20	2
2487953	99	32	28,3	cyclictest	2737721	-21	kworker/u8:0+events_unbound	23:50:21	2
2487950	99	32	28,3	cyclictest	2737721	-21	kworker/u8:0+flush-259:0	23:40:00	1
2487953	99	31	28,2	cyclictest	2487906	-21	kworker/u8:3+events_unbound	19:45:21	2
2487958	99	30	26,3	cyclictest	2831446	-21	apt-get	00:40:00	3
2487953	99	30	27,2	cyclictest	2669899	-21	kworker/u8:1+flush-259:0	00:15:24	2
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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