OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #e, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rackeslot6.osadl.org (updated Sat May 23, 2026 12:44:50)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2835936	99	111	99,9	cyclictest	2873106	-21	latency_hist	09:05:01	0
2835936	99	110	103,5	cyclictest	2887690	-21	latency_hist	09:50:01	0
2835936	99	110	103,5	cyclictest	2887690	-21	latency_hist	09:50:01	0
2835936	99	108	98,7	cyclictest	2897253	-21	latency_hist	10:20:01	0
2835936	99	108	94,11	cyclictest	1213033	-21	systemd-journal	11:59:59	0
2835936	99	108	0,106	cyclictest	1	-21	systemd	10:40:00	0
2835936	99	106	93,10	cyclictest	2923244	-21	apt-get	11:40:00	0
2835940	99	105	99,4	cyclictest	2898821	-21	kworker/u8:1+flush-179:0	10:30:26	1
2835940	99	105	97,7	cyclictest	2939466	-21	kworker/u8:3+flush-179:0	12:40:00	1
2835940	99	104	98,4	cyclictest	2920089	-21	kworker/u8:3+flush-179:0	12:15:00	1
2835940	99	103	97,4	cyclictest	2852646	-21	kworker/u8:1+events_unbound	08:05:00	1
2835936	99	100	89,9	cyclictest	2873603	-21	/usr/sbin/munin	09:05:23	0
2835940	99	99	89,7	cyclictest	2925096	-21	latency_hist	11:45:01	1
2835940	99	97	91,4	cyclictest	2910546	-21	kworker/u8:3+events_unbound	11:10:01	1
2835940	99	97	91,4	cyclictest	2879768	-21	kworker/u8:1+flush-179:0	09:30:00	1
2835940	99	97	90,5	cyclictest	2937835	-21	latency_hist	12:25:02	1
2835940	99	96	91,4	cyclictest	2876523	-21	kworker/u8:0+events_unbound	10:25:26	1
2835940	99	92	87,4	cyclictest	2908619	-21	kworker/u8:1+events_unbound	11:55:24	1
2835940	99	92	82,8	cyclictest	2892730	-21	apt-get	10:05:11	1
2835940	99	91	86,4	cyclictest	2870919	-21	kworker/u8:0+flush-179:0	08:55:26	1
2835940	99	91	82,6	cyclictest	2898821	-21	kworker/u8:1+events_unbound	10:35:14	1
2835936	99	91	81,7	cyclictest	2915271	-21	latency_hist	11:15:01	0
2835940	99	90	84,5	cyclictest	2814660	-21	kworker/u8:1+flush-179:0	07:20:01	1
2835936	99	89	81,5	cyclictest	2939423	-21	latency_hist	12:30:01	0
2835936	99	89	81,5	cyclictest	2898821	-21	kworker/u8:1+flush-179:0	10:30:15	0
2835940	99	87	81,4	cyclictest	2916915	-21	kworker/u8:2+events_unbound	11:25:18	1
2835940	99	87	78,7	cyclictest	2921643	-21	latency_hist	11:35:01	1
2835940	99	86	79,5	cyclictest	2941010	-21	latency_hist	12:35:00	1
2835936	99	86	78,6	cyclictest	2852411	-21	latency_hist	08:00:02	0
2835940	99	85	80,4	cyclictest	2876523	-21	kworker/u8:0+events_unbound	09:40:24	1
2835940	99	84	78,5	cyclictest	2861987	-21	kworker/u8:3+flush-179:0	08:30:24	1
2835940	99	84	76,6	cyclictest	2900668	-21	kworker/u8:2+flush-179:0	10:40:20	1
2835936	99	84	79,4	cyclictest	2845765	-21	kworker/u8:1+flush-179:0	07:40:00	0
2835936	99	84	74,7	cyclictest	2892487	-21	latency_hist	10:05:01	0
2835940	99	83	77,4	cyclictest	2840596	-21	latency_hist	07:25:02	1
2835940	99	82	77,4	cyclictest	2920089	-21	kworker/u8:3+flush-179:0	12:05:01	1
2835940	99	81	75,4	cyclictest	2920089	-21	kworker/u8:3+flush-179:0	11:50:20	1
2835940	99	81	74,5	cyclictest	2843762	-21	kworker/u8:3+flush-179:0	08:00:00	1
2835940	99	80	75,3	cyclictest	2910473	-21	kworker/u8:0+events_unbound	11:05:00	1
2835940	99	80	70,8	cyclictest	2926681	-21	latency_hist	11:50:01	1
2835936	99	80	69,8	cyclictest	2916915	-21	kworker/u8:2+flush-179:0	11:30:23	0
2835940	99	79	71,6	cyclictest	2870919	-21	kworker/u8:0+events_unbound	09:05:01	1
2835940	99	78	73,4	cyclictest	2934616	-21	kworker/u8:1+events_unbound	12:25:24	1
2835940	99	78	70,7	cyclictest	2821074	-21	kworker/u8:0+flush-179:0	07:15:00	1
2835936	99	78	69,7	cyclictest	2821074	-21	kworker/u8:0+events_unbound	07:20:25	0
2835936	99	78	68,8	cyclictest	2860622	-21	apt-get	08:25:12	0
2835940	99	77	71,5	cyclictest	2900668	-21	kworker/u8:2+events_unbound	10:45:19	1
2835940	99	77	68,6	cyclictest	2887725	-21	kworker/u8:3+events_unbound	10:00:22	1
2835940	99	77	68,4	cyclictest	2908619	-21	kworker/u8:1+events_unbound	11:35:18	1
2835940	99	77	67,8	cyclictest	510	-21	rs:main		1
2835936	99	77	72,4	cyclictest	2843762	-21	kworker/u8:3+flush-179:0	07:45:14	0
2835940	99	75	68,5	cyclictest	2920089	-21	kworker/u8:3+events_unbound	12:15:19	1
2835940	99	75	68,5	cyclictest	2849213	-21	latency_hist	07:50:01	1
2835940	99	74	68,4	cyclictest	2843416	-21	kworker/u8:0+flush-179:0	08:20:19	1
2835940	99	74	66,5	cyclictest	2876523	-21	kworker/u8:0+flush-179:0	10:50:21	1
2835940	99	74	66,5	cyclictest	2855021	-21	kworker/u8:2+flush-179:0	08:15:21	1
2835940	99	73	68,4	cyclictest	2861987	-21	kworker/u8:3+flush-179:0	08:35:26	1
2835940	99	73	53,5	cyclictest	2876523	-21	kworker/u8:0+events_unbound	09:35:16	1
2835936	99	73	64,7	cyclictest	2879733	-21	latency_hist	09:25:01	0
2835936	99	73	64,5	cyclictest	2843762	-21	kworker/u8:3+events_unbound	07:45:02	0
2835936	99	73	64,5	cyclictest	2843762	-21	kworker/u8:3+events_unbound	07:45:01	0
2835940	99	72	67,4	cyclictest	2876523	-21	kworker/u8:0+flush-179:0	10:15:25	1
2835940	99	71	63,5	cyclictest	2843416	-21	kworker/u8:0+flush-179:0	08:10:22	1
2835936	99	71	59,10	cyclictest	2866992	-21	apt-get	08:45:12	0
2835941	99	70	38,2	cyclictest	0	-21	swapper/2	08:26:59	2
2835940	99	70	65,4	cyclictest	2876578	-21	kworker/u8:2+events_unbound	09:20:22	1
2835940	99	70	65,3	cyclictest	2886655	-21	kworker/u8:2+flush-179:0	10:10:21	1
2835940	99	70	60,7	cyclictest	1213033	-21	systemd-journal	08:05:21	1
2835936	99	70	63,5	cyclictest	2842440	-21	apt-get	07:30:11	0
2835936	99	70	60,8	cyclictest	2876523	-21	kworker/u8:0+flush-179:0	09:40:01	0
2835940	99	69	64,3	cyclictest	2861987	-21	kworker/u8:3+events_unbound	08:50:20	1
2835940	99	69	63,4	cyclictest	2930539	-21	kworker/u8:0+flush-179:0	12:05:21	1
2835936	99	69	61,6	cyclictest	2835828	-21	kworker/u8:2+flush-179:0	07:25:23	0
2835940	99	68	62,5	cyclictest	2887725	-21	kworker/u8:3+flush-179:0	09:55:26	1
2835940	99	68	56,9	cyclictest	2881865	-21	diskstats	09:30:15	1
2835936	99	68	60,6	cyclictest	2898841	-21	latency_hist	10:25:01	0
2835936	99	68	59,7	cyclictest	2916868	-21	latency_hist	11:20:01	0
2835940	99	66	60,5	cyclictest	2876523	-21	kworker/u8:0+events_unbound	10:20:17	1
2835936	99	66	60,4	cyclictest	2910473	-21	kworker/u8:0+flush-179:0	11:05:22	0
2835936	99	66	58,6	cyclictest	2930539	-21	kworker/u8:0+flush-179:0	12:15:16	0
2835940	99	65	59,5	cyclictest	2843416	-21	kworker/u8:0+events_unbound	07:35:03	1
2835936	99	65	60,4	cyclictest	2920089	-21	kworker/u8:3+events_unbound	12:10:22	0
2835936	99	65	60,4	cyclictest	2821074	-21	kworker/u8:0+flush-179:0	07:10:16	0
2835936	99	65	58,4	cyclictest	2886655	-21	kworker/u8:2+flush-179:0	10:10:21	0
45770	91	64	0,13	ptp4l	44	1	ktimers/3	07:10:01	3
2835940	99	64	58,4	cyclictest	2861987	-21	kworker/u8:3+events_unbound	09:10:20	1
2835940	99	64	57,4	cyclictest	2916915	-21	kworker/u8:2+events_unbound	11:20:20	1
2835940	99	64	54,5	cyclictest	2843762	-21	kworker/u8:3+events_unbound	07:50:21	1
2835936	99	64	57,5	cyclictest	2907066	-21	latency_hist	10:50:00	0
2835941	99	63	60,2	cyclictest	0	-21	swapper/2	08:02:59	2
2835940	99	63	48,12	cyclictest	2847381	-21	apt-get	07:45:00	1
2835940	99	63	48,12	cyclictest	2847381	-21	apt-get	07:45:00	1
2835936	99	63	57,5	cyclictest	2843416	-21	kworker/u8:0+flush-179:0	08:05:26	0
2835936	99	63	53,5	cyclictest	2855021	-21	kworker/u8:2+flush-179:0	08:15:22	0
2835936	99	63	52,9	cyclictest	2936793	-21	diskstats	12:20:15	0
2835936	99	62	57,4	cyclictest	2916915	-21	kworker/u8:2+flush-179:0	11:20:15	0
2835936	99	62	56,4	cyclictest	2843416	-21	kworker/u8:0+events_unbound	08:10:18	0
2835936	99	61	54,5	cyclictest	2861987	-21	kworker/u8:3+flush-179:0	08:40:17	0
2835936	99	61	53,6	cyclictest	1213033	-21	systemd-journal	09:42:04	0
2835940	99	60	53,5	cyclictest	2886655	-21	kworker/u8:2+events_unbound	09:45:20	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2020-10-04 - 12:21