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 Fri Jul 10, 2026 12:44:06)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1707943	99	50	38,9	cyclictest	1899505	-21	latency_hist	10:15:01	3
1707937	99	39	35,3	cyclictest	1894383	-21	kworker/u8:0+events_unbound	10:35:01	1
1707937	99	38	34,3	cyclictest	1930683	-21	kworker/u8:4+events_unbound	12:25:26	1
1707937	99	35	32,2	cyclictest	1790895	-21	kworker/u8:2+flush-259:0	09:00:25	1
1707943	99	34	28,4	cyclictest	1785760	-21	latency_hist	08:25:01	3
1707943	99	32	26,4	cyclictest	1707858	-21	latency_hist	07:10:00	3
1707940	99	32	28,3	cyclictest	1946774	-21	kworker/u8:2+flush-259:0	11:29:59	2
1707937	99	30	26,3	cyclictest	1848259	-21	kworker/u8:4+events_unbound	09:55:18	1
1707937	99	30	26,3	cyclictest	1744640	-21	/usr/sbin/munin	07:45:25	1
1707933	99	30	24,4	cyclictest	1713058	-21	latency_hist	07:15:00	0
1707937	99	29	26,2	cyclictest	1873836	-21	kworker/u8:2+events_unbound	09:50:23	1
1707933	99	29	22,5	cyclictest	1930791	-21	latency_hist	10:45:01	0
1707943	99	28	24,3	cyclictest	1930682	-21	kworker/u8:3+flush-259:0	10:55:00	3
1707943	99	28	23,3	cyclictest	1822481	-21	/usr/sbin/munin	09:00:15	3
1707940	99	28	24,3	cyclictest	335557	-21	systemd-journal	09:47:24	2
1707940	99	28	24,3	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	08:00:00	2
1707940	99	28	23,4	cyclictest	1914014	-21	ntpq	10:25:20	2
1707933	99	28	24,3	cyclictest	1848259	-21	kworker/u8:4+flush-259:0	09:40:25	0
1707933	99	28	24,3	cyclictest	1848259	-21	kworker/u8:4+flush-259:0	09:40:24	0
1707937	99	27	23,3	cyclictest	1734075	-21	kworker/u8:1+events_unbound	08:35:14	1
1707933	99	27	23,3	cyclictest	1717939	-21	kworker/u8:0+flush-259:0	07:45:23	0
1707943	99	26	21,3	cyclictest	1904644	-21	kworker/u8:1+flush-259:0	10:35:17	3
1707940	99	26	22,3	cyclictest	1759648	-21	kworker/u8:4+flush-259:0	08:25:26	2
1707937	99	26	22,3	cyclictest	1978221	-21	kworker/u8:1+events_unbound	11:34:02	1
1707937	99	26	22,3	cyclictest	1930683	-21	kworker/u8:4+events_unbound	11:35:07	1
1707937	99	26	22,3	cyclictest	1702600	-21	kworker/u8:2+flush-259:0	07:10:19	1
1707937	99	26	19,6	cyclictest	1951853	-21	apt-get	11:05:01	1
1707937	99	26	19,5	cyclictest	2044913	-21	ntpq	12:30:19	1
1707933	99	26	19,5	cyclictest	1909760	-21	latency_hist	10:25:01	0
1707937	99	25	22,2	cyclictest	1930683	-21	kworker/u8:4+flush-259:0	12:20:25	1
1707937	99	25	21,3	cyclictest	1718307	-21	gpgv	07:20:00	1
1707943	99	24	20,3	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	09:00:00	3
1707943	99	24	19,3	cyclictest	2020282	-21	/usr/sbin/munin	12:10:13	3
1707940	99	24	20,3	cyclictest	1951970	-21	gpgv	11:05:00	2
1707940	99	24	20,3	cyclictest	1930683	-21	kworker/u8:4+flush-259:0	11:35:25	2
1707937	99	24	21,2	cyclictest	1827424	-21	kworker/u8:0+events_unbound	09:30:24	1
1707937	99	24	21,2	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	09:15:24	1
1707937	99	24	21,2	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	08:10:26	1
1707937	99	24	20,3	cyclictest	1930683	-21	kworker/u8:4+flush-259:0	11:05:11	1
1707937	99	24	20,3	cyclictest	1790895	-21	kworker/u8:2+events_unbound	09:13:38	1
1707937	99	24	20,3	cyclictest	1734075	-21	kworker/u8:1+events_unbound	09:20:18	1
1707943	99	23	17,4	cyclictest	2009235	-21	cat	12:00:00	3
1707943	99	23	17,4	cyclictest	1904621	-21	latency_hist	10:20:00	3
1707940	99	23	19,3	cyclictest	1904857	-21	/usr/sbin/munin	10:20:14	2
1707940	99	23	18,4	cyclictest	335557	-21	systemd-journal	11:50:00	2
1707937	99	23	20,2	cyclictest	2025443	-21	kworker/u8:0+flush-259:0	12:35:16	1
1707937	99	23	20,2	cyclictest	1827424	-21	kworker/u8:0+flush-259:0	09:25:21	1
1707937	99	23	20,2	cyclictest	1717939	-21	kworker/u8:0+flush-259:0	07:40:16	1
1707937	99	23	19,3	cyclictest	1930683	-21	kworker/u8:4+flush-259:0	12:04:25	1
1707937	99	23	19,3	cyclictest	1858396	-21	kworker/u8:1+events_unbound	09:35:15	1
1707937	99	23	19,3	cyclictest	1858396	-21	kworker/u8:1+events_unbound	09:35:14	1
1707937	99	23	19,3	cyclictest	1734075	-21	kworker/u8:1+events_unbound	07:51:01	1
1707933	99	23	20,2	cyclictest	1993454	-21	kworker/u8:3+flush-259:0	11:45:25	0
1707933	99	23	19,3	cyclictest	1848259	-21	kworker/u8:4+flush-259:0	10:00:23	0
1707933	99	23	19,3	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	08:30:16	0
1707940	99	22	18,3	cyclictest	1790895	-21	kworker/u8:2+flush-259:0	08:40:01	2
1707940	99	22	18,3	cyclictest	1734075	-21	kworker/u8:1+flush-259:0	09:20:25	2
1707940	99	22	18,3	cyclictest	1723983	-21	kworker/u8:2+flush-259:0	07:45:00	2
1707940	99	22	17,4	cyclictest	1972854	-21	latency_hist	11:25:01	2
1707937	99	22	19,2	cyclictest	1894383	-21	kworker/u8:0+events_unbound	10:18:25	1
1707933	99	22	16,4	cyclictest	2009546	-21	base64	12:00:00	0
1707937	99	21	18,2	cyclictest	1993451	-21	kworker/u8:2+flush-259:0	11:50:20	1
1707937	99	21	18,2	cyclictest	1790895	-21	kworker/u8:2+events_unbound	08:50:21	1
1707937	99	21	17,3	cyclictest	1930683	-21	kworker/u8:4+events_unbound	12:10:03	1
1707933	99	21	16,3	cyclictest	1988554	-21	apt-get	11:40:12	0
1707933	99	21	16,3	cyclictest	1930682	-21	kworker/u8:3+flush-259:0	10:55:27	0
1707933	99	21	14,5	cyclictest	1935086	-21	ntpq	10:45:22	0
1707943	99	20	14,4	cyclictest	1884326	-21	/usr/sbin/munin	10:00:13	3
1707937	99	20	17,2	cyclictest	1790895	-21	kworker/u8:2+flush-259:0	08:55:27	1
1707937	99	20	16,3	cyclictest	490	-21	dbus-daemon	10:30:00	1
1707937	99	20	16,3	cyclictest	1790895	-21	kworker/u8:2+flush-259:0	09:05:24	1
1707937	99	20	16,2	cyclictest	0	-21	swapper/1	10:50:02	1
1707933	99	20	17,2	cyclictest	1873836	-21	kworker/u8:2+flush-259:0	10:10:16	0
1707933	99	20	15,4	cyclictest	2008933	-21	apt-get	12:00:00	0
1707943	99	19	13,4	cyclictest	2019622	-21	latency_hist	12:10:01	3
1707943	99	19	12,5	cyclictest	1971956	-21	ntpq	11:20:21	3
1707943	99	19	12,5	cyclictest	1811908	-21	base64	08:50:01	3
1707943	99	19	12,4	cyclictest	1978229	-21	/usr/sbin/munin	11:30:18	3
1707940	99	19	15,3	cyclictest	1978221	-21	kworker/u8:1+flush-259:0	11:40:24	2
1707940	99	19	15,3	cyclictest	1930682	-21	kworker/u8:3+flush-259:0	10:55:25	2
1707937	99	19	16,2	cyclictest	1644285	-21	kworker/u8:1+flush-259:0	07:20:14	1
1707937	99	19	15,3	cyclictest	1848259	-21	kworker/u8:4+events_unbound	10:10:49	1
1707937	99	19	15,3	cyclictest	1734075	-21	kworker/u8:1+events_unbound	08:00:13	1
1707933	99	19	15,3	cyclictest	1692248	-21	kworker/u8:3+flush-259:0	07:20:00	0
1707943	99	18	15,2	cyclictest	1723983	-21	kworker/u8:2+flush-259:0	07:35:20	3
1707943	99	18	14,3	cyclictest	1978221	-21	kworker/u8:1+flush-259:0	11:44:59	3
1707943	99	18	12,4	cyclictest	335557	-21	systemd-journal	08:10:24	3
1707943	99	18	12,4	cyclictest	1765142	-21	latency_hist	08:05:01	3
1707940	99	18	15,2	cyclictest	1729614	-21	irqcore	07:30:18	2
1707940	99	18	11,5	cyclictest	1837732	-21	latency_hist	09:15:00	2
1707937	99	18	15,2	cyclictest	1848259	-21	kworker/u8:4+flush-259:0	09:45:18	1
1707937	99	18	15,2	cyclictest	1765183	-21	kworker/u8:0+events_unbound	08:20:27	1
1707937	99	18	14,3	cyclictest	1946774	-21	kworker/u8:2+events_unbound	11:23:25	1
1707937	99	18	14,3	cyclictest	1790895	-21	kworker/u8:2+events_unbound	08:47:15	1
1707937	99	18	13,3	cyclictest	1978221	-21	kworker/u8:1+events_unbound	11:40:11	1
1707937	99	18	12,4	cyclictest	1973091	-21	/usr/sbin/munin	11:25:13	1
1707933	99	18	12,4	cyclictest	1806409	-21	latency_hist	08:45:01	0
1707943	99	17	13,3	cyclictest	1873836	-21	kworker/u8:2+flush-259:0	09:50:26	3
1707943	99	17	12,4	cyclictest	1734075	-21	kworker/u8:1+events_unbound	08:35:18	3
1707940	99	17	14,2	cyclictest	0	-21	swapper/2	11:35:00	2
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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