OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #0, slot #2

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 50 highest latencies:

System rack0slot2.osadl.org (updated Sat May 02, 2026 12:43:33)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2187582	2	95	0,0	sleep6	86	-21	ksoftirqd/6	10:44:09	6
1718560	2	46	36,7	sleep4	0	-21	swapper/4	07:07:08	4
1718533	2	46	35,8	sleep5	0	-21	swapper/5	07:06:45	5
1718975	99	45	43,2	cyclictest	2338461	-21	kworker/u16:2+flush-8:0	12:14:18	6
1718967	99	44	41,2	cyclictest	2317626	-21	kworker/u16:1+flush-8:0	11:44:07	5
1718967	99	44	40,3	cyclictest	2208307	-21	kworker/u16:4+events_unbound	10:59:04	5
1718979	99	41	38,2	cyclictest	124	-21	kswapd0	11:43:50	7
1709148	2	39	3,30	sleep7	0	-21	swapper/7	07:03:51	7
1718975	99	38	36,2	cyclictest	2038224	-21	kworker/u16:2+flush-8:0	10:48:52	6
1718975	99	37	34,2	cyclictest	2370100	-21	kworker/u16:1+events_unbound	12:03:51	6
1718964	99	37	34,2	cyclictest	1924159	-21	kworker/u16:2+flush-8:0	09:24:05	4
1718979	99	36	30,5	cyclictest	1789705	-21	latency_hist	07:43:50	7
1718975	99	36	34,2	cyclictest	2123639	-21	kworker/u16:0+events_unbound	12:29:14	6
1718975	99	36	34,2	cyclictest	2038224	-21	kworker/u16:2+flush-8:0	09:53:49	6
1718975	99	36	34,2	cyclictest	1828445	-21	kworker/u16:4+events_unbound	09:22:55	6
1718975	99	36	33,2	cyclictest	2086645	-21	kworker/u16:1+flush-8:0	10:03:59	6
1718975	99	35	33,2	cyclictest	2208307	-21	kworker/u16:4+flush-8:0	11:34:04	6
1718975	99	35	33,2	cyclictest	2208307	-21	kworker/u16:4+flush-8:0	11:04:05	6
1718975	99	35	33,2	cyclictest	2208307	-21	kworker/u16:4+events_unbound	11:44:11	6
1718975	99	35	33,2	cyclictest	2123639	-21	kworker/u16:0+flush-8:0	11:16:00	6
1718505	2	35	25,7	sleep6	0	-21	swapper/6	07:06:22	6
1718975	99	34	31,2	cyclictest	2038224	-21	kworker/u16:2+flush-8:0	11:09:00	6
1718979	99	33	31,1	cyclictest	1952647	-21	diskmemload	11:29:00	7
1718975	99	33	31,2	cyclictest	2370100	-21	kworker/u16:1+flush-8:0	11:59:10	6
1718975	99	33	31,2	cyclictest	2370100	-21	kworker/u16:1+flush-8:0	11:59:10	6
1718975	99	33	31,2	cyclictest	2338461	-21	kworker/u16:2+events_unbound	11:56:31	6
1718975	99	33	31,2	cyclictest	2038224	-21	kworker/u16:2+flush-8:0	09:58:31	6
1718975	99	33	31,2	cyclictest	1942270	-21	kworker/u16:1+flush-8:0	09:15:00	6
1718975	99	33	30,2	cyclictest	2370100	-21	kworker/u16:1+flush-8:0	12:33:59	6
1718975	99	33	30,2	cyclictest	2338461	-21	kworker/u16:2+flush-8:0	12:24:05	6
1718967	99	33	31,2	cyclictest	2123639	-21	kworker/u16:0+flush-8:0	10:43:44	5
1718967	99	33	31,2	cyclictest	2123639	-21	kworker/u16:0+flush-8:0	10:43:44	5
1718979	99	32	29,2	cyclictest	2365749	-21	ssh	11:58:09	7
1718979	99	32	29,2	cyclictest	2197420	-21	ps	10:49:06	7
1718975	99	32	30,2	cyclictest	2208307	-21	kworker/u16:4+events_unbound	11:43:47	6
1718975	99	32	30,2	cyclictest	2123639	-21	kworker/u16:0+flush-8:0	11:27:15	6
1718975	99	32	30,2	cyclictest	2074144	-21	kworker/u16:3+events_unbound	10:12:04	6
1718975	99	31	29,2	cyclictest	2338461	-21	kworker/u16:2+flush-8:0	11:49:31	6
1718975	99	31	29,2	cyclictest	2074144	-21	kworker/u16:3+flush-8:0	10:14:59	6
1718975	99	31	29,2	cyclictest	1635599	-21	kworker/u16:4+flush-8:0	07:14:20	6
1718979	99	30	29,0	cyclictest	0	-21	swapper/7	12:16:02	7
1718979	99	30	29,0	cyclictest	0	-21	swapper/7	11:59:45	7
1718979	99	30	29,0	cyclictest	0	-21	swapper/7	11:59:45	7
1718975	99	30	28,2	cyclictest	2123639	-21	kworker/u16:0+events_unbound	10:32:00	6
1718975	99	30	28,2	cyclictest	2123639	-21	kworker/u16:0+events_unbound	10:28:00	6
1718979	99	29	28,0	cyclictest	0	-21	swapper/7	07:09:17	7
1718975	99	29	27,2	cyclictest	1988995	-21	kworker/u16:0+flush-8:0	09:34:48	6
1718975	99	29	27,2	cyclictest	1988995	-21	kworker/u16:0+events_unbound	10:02:59	6
1718975	99	29	27,2	cyclictest	1988995	-21	kworker/u16:0+events_unbound	10:02:59	6
1718967	99	29	27,2	cyclictest	2038224	-21	kworker/u16:2+events_unbound	10:54:03	5
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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