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 100 highest latencies:

System rack0slot2.osadl.org (updated Sun Jul 26, 2026 00:43:34)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
296938	2	62	50,8	sleep5	0	-21	swapper/5	19:05:50	5
297112	2	52	17,30	sleep7	0	-21	swapper/7	19:08:16	7
297476	99	46	40,5	cyclictest	557654	-21	latency_hist	21:19:13	7
297476	99	45	41,2	cyclictest	727694	-21	munin-run	22:29:12	7
297471	99	42	39,3	cyclictest	821290	-21	kworker/u16:2+flush-8:0	23:44:12	6
297476	99	41	0,39	cyclictest	320659	-21	latency_hist	19:19:13	7
297458	99	41	39,2	cyclictest	224055	-21	kworker/u16:1+flush-8:0	19:19:13	4
296910	2	39	28,8	sleep6	0	-21	swapper/6	19:05:26	6
296880	2	37	26,8	sleep4	0	-21	swapper/4	19:05:00	4
297471	99	34	31,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	20:29:13	6
297466	99	32	28,3	cyclictest	934015	-21	kworker/u16:4+flush-8:0	00:09:13	5
297476	99	31	25,5	cyclictest	648	-21	systemd-journal	19:24:13	7
297458	99	31	28,2	cyclictest	821290	-21	kworker/u16:2+flush-8:0	23:14:13	4
861979	2	30	0,1	chrt	0	-21	swapper/5	23:24:23	5
297471	99	29	27,2	cyclictest	320662	-21	kworker/u16:2+events_unbound	19:24:43	6
297471	99	29	27,2	cyclictest	320662	-21	kworker/u16:2+events_unbound	19:24:43	6
297466	99	29	27,2	cyclictest	436857	-21	kworker/u16:1+events_unbound	22:04:31	5
297458	99	29	26,2	cyclictest	702270	-21	kworker/u16:3+flush-8:0	23:34:36	4
753051	2	27	0,0	sleep5	0	-21	swapper/5	22:39:28	5
297476	99	27	26,0	cyclictest	0	-21	swapper/7	23:09:22	7
297476	99	26	21,4	cyclictest	861318	-21	latency_hist	23:24:13	7
297476	99	26	21,4	cyclictest	581968	-21	latency_hist	21:29:12	7
297458	99	26	23,2	cyclictest	378764	-21	kworker/u16:4+events_unbound	21:19:30	4
297476	99	25	20,4	cyclictest	824808	-21	latency_hist	23:09:12	7
297471	99	25	23,2	cyclictest	436857	-21	kworker/u16:1+flush-8:0	21:39:28	6
297471	99	25	22,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	21:14:18	6
297466	99	25	21,3	cyclictest	378764	-21	kworker/u16:4+flush-8:0	22:34:18	5
297458	99	25	23,2	cyclictest	436857	-21	kworker/u16:1+events_unbound	21:09:36	4
297476	99	24	20,3	cyclictest	125	-21	kswapd0	00:34:12	7
297458	99	23	20,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	21:54:45	4
297476	99	22	20,1	cyclictest	533346	-21	diskmemload	21:34:41	7
297458	99	22	20,2	cyclictest	436857	-21	kworker/u16:1+flush-8:0	20:34:39	4
297458	99	22	20,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	20:24:41	4
297458	99	22	20,2	cyclictest	378764	-21	kworker/u16:4+events_unbound	21:29:42	4
297476	99	21	0,19	cyclictest	921848	-21	latency_hist	23:49:12	7
297471	99	21	19,2	cyclictest	378764	-21	kworker/u16:4+events_unbound	21:24:27	6
297476	99	20	19,0	cyclictest	0	-21	swapper/7	19:24:30	7
297476	99	20	19,0	cyclictest	0	-21	swapper/7	19:24:30	7
297476	99	20	14,5	cyclictest	648	-21	systemd-journal	21:44:12	7
297471	99	20	17,2	cyclictest	297244	-21	kworker/u16:3+flush-8:0	19:29:39	6
297476	99	19	18,0	cyclictest	0	-21	swapper/7	20:34:31	7
297476	99	19	0,17	cyclictest	928599	-21	cut	23:49:35	7
297458	99	19	17,2	cyclictest	205779	-21	kworker/u16:0+flush-8:0	19:39:49	4
297458	99	19	16,3	cyclictest	297244	-21	kworker/u16:3+flush-8:0	19:29:31	4
297476	99	18	14,3	cyclictest	885496	-21	latency_hist	23:34:12	7
297476	99	18	13,4	cyclictest	982697	-21	latency_hist	00:14:12	7
297476	99	18	0,16	cyclictest	388384	-21	sed	19:54:13	7
297471	99	18	16,2	cyclictest	436857	-21	kworker/u16:1+events_unbound	21:44:37	6
297471	99	18	16,2	cyclictest	436857	-21	kworker/u16:1+events_unbound	20:19:36	6
297471	99	18	15,2	cyclictest	378763	-21	kworker/u16:3+flush-8:0	20:09:31	6
297471	99	18	15,2	cyclictest	378763	-21	kworker/u16:3+flush-8:0	20:09:31	6
297458	99	18	15,2	cyclictest	670624	-21	kworker/u16:0+flush-8:0	22:19:12	4
297476	99	17	13,3	cyclictest	1302	-21	snmpd	23:01:27	7
297476	99	17	13,3	cyclictest	1302	-21	snmpd	23:01:27	7
297476	99	17	12,4	cyclictest	691263	-21	latency_hist	22:14:12	7
297476	99	17	0,1	cyclictest	0	-21	swapper/7	20:09:39	7
297476	99	17	0,1	cyclictest	0	-21	swapper/7	20:09:39	7
297476	99	17	0,15	cyclictest	870447	-21	sshd-session	23:24:41	7
297476	99	17	0,15	cyclictest	514103	-21	cat	20:59:13	7
297471	99	17	16,1	cyclictest	0	-21	swapper/6	20:32:02	6
297471	99	17	15,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	20:44:40	6
297471	99	17	15,2	cyclictest	378763	-21	kworker/u16:3+flush-8:0	20:14:18	6
297471	99	17	15,2	cyclictest	359664	-21	kworker/u16:2+flush-8:0	19:49:13	6
297471	99	17	15,2	cyclictest	339650	-21	kworker/u16:1+events_unbound	19:39:54	6
297466	99	17	13,3	cyclictest	968280	-21	kworker/u16:0+flush-8:0	00:34:48	5
297476	99	16	0,14	cyclictest	1767	-21	dockerd	19:09:37	7
297471	99	16	13,2	cyclictest	763084	-21	kworker/u16:1+flush-8:0	22:54:41	6
297458	99	16	13,3	cyclictest	378764	-21	kworker/u16:4+events_unbound	21:24:39	4
297476	99	15	9,5	cyclictest	349642	-21	latency_hist	19:34:13	7
297476	99	15	13,1	cyclictest	1016814	-21	ssh	00:24:53	7
297476	99	15	0,13	cyclictest	1302	-21	snmpd	21:53:28	7
297471	99	15	13,2	cyclictest	436857	-21	kworker/u16:1+flush-8:0	20:34:28	6
297471	99	15	13,2	cyclictest	378764	-21	kworker/u16:4+flush-8:0	19:54:44	6
297458	99	15	13,2	cyclictest	702270	-21	kworker/u16:3+flush-8:0	23:19:43	4
297458	99	15	13,2	cyclictest	569870	-21	kworker/u16:2+events_unbound	21:39:42	4
297458	99	15	0,14	cyclictest	0	-21	swapper/4	23:54:21	4
297476	99	14	13,0	cyclictest	0	-21	swapper/7	20:24:37	7
297476	99	14	0,13	cyclictest	0	-21	swapper/7	21:44:39	7
297471	99	14	0,14	cyclictest	0	-21	swapper/6	00:29:10	6
297466	99	14	13,1	cyclictest	0	-21	swapper/5	23:59:29	5
297466	99	14	13,1	cyclictest	0	-21	swapper/5	21:42:48	5
297466	99	14	13,1	cyclictest	0	-21	swapper/5	21:09:22	5
297466	99	14	0,1	cyclictest	0	-21	swapper/5	21:25:46	5
297466	99	14	0,14	cyclictest	0	-21	swapper/5	22:31:59	5
297466	99	14	0,14	cyclictest	0	-21	swapper/5	22:20:00	5
297466	99	14	0,14	cyclictest	0	-21	swapper/5	21:59:39	5
297466	99	14	0,14	cyclictest	0	-21	swapper/5	00:19:02	5
297458	99	14	13,1	cyclictest	0	-21	swapper/4	23:40:19	4
297458	99	14	13,1	cyclictest	0	-21	swapper/4	23:31:29	4
297458	99	14	13,1	cyclictest	0	-21	swapper/4	21:16:12	4
297458	99	14	13,1	cyclictest	0	-21	swapper/4	00:23:50	4
297458	99	14	13,1	cyclictest	0	-21	swapper/4	00:23:50	4
297458	99	14	10,3	cyclictest	1031373	-21	kworker/u16:3+flush-8:0	00:34:17	4
297458	99	14	0,1	cyclictest	0	-21	swapper/4	23:15:43	4
297458	99	14	0,1	cyclictest	0	-21	swapper/4	23:02:57	4
297458	99	14	0,1	cyclictest	0	-21	swapper/4	23:02:57	4
297458	99	14	0,1	cyclictest	0	-21	swapper/4	22:38:49	4
297458	99	14	0,14	cyclictest	0	-21	swapper/4	22:40:15	4
297458	99	14	0,14	cyclictest	0	-21	swapper/4	22:26:22	4
297458	99	14	0,14	cyclictest	0	-21	swapper/4	21:51:50	4
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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