OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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
Special All - All RT - Optimization - Ethernet - Thumbnails - Next

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, lowest P state: ondemand
Compare latency of primary with shadow system

Characteristics of the 100 highest latencies:

System rack5slot4s.osadl.org (updated Fri Apr 24, 2026 12:44:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2431173	2	94	0,4	chrt	0	-21	swapper/0	12:06:12	0
2134271	99	67	58,6	cyclictest	2166606	-21	latency_hist	07:40:01	0
2134275	99	65	58,5	cyclictest	2134118	-21	kworker/u8:2+flush-8:0	07:21:25	1
2134275	99	65	56,7	cyclictest	2196387	-21	cp	08:10:00	1
2134275	99	62	51,8	cyclictest	2261012	-21	apt-get	09:15:01	1
2134271	99	59	53,4	cyclictest	2231381	-21	kworker/u8:3+flush-8:0	09:56:23	0
2134280	99	57	45,9	cyclictest	2170774	-21	ntpq	07:41:19	2
2134275	99	56	49,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	10:36:22	1
2134275	99	56	49,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	10:36:22	1
2134275	99	56	48,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	08:36:09	1
2134271	99	56	47,7	cyclictest	2285649	-21	kworker/u8:1+flush-8:0	09:41:19	0
2134275	99	55	47,6	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	09:01:09	1
2134271	99	55	48,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	10:46:19	0
2134275	99	54	47,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	08:21:11	1
2134271	99	54	49,4	cyclictest	2176553	-21	kworker/u8:2+events_unbound	08:00:01	0
2134271	99	54	47,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	09:21:20	0
2134271	99	54	46,6	cyclictest	2355119	-21	kworker/u8:3+events_unbound	10:56:21	0
2134271	99	54	44,7	cyclictest	2236879	-21	diskstats	08:51:10	0
2134271	99	54	44,7	cyclictest	2236879	-21	diskstats	08:51:10	0
2134271	99	53	48,3	cyclictest	2330603	-21	kworker/u8:4+flush-8:0	10:31:09	0
2134275	99	52	45,5	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	12:26:08	1
2134275	99	52	45,5	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	12:26:08	1
2134275	99	52	41,8	cyclictest	2156472	-21	latency_hist	07:30:01	1
2134271	99	52	48,3	cyclictest	2211840	-21	kworker/u8:1+flush-8:0	08:26:22	0
2134271	99	52	40,9	cyclictest	2448719	-21	ntpq	12:21:17	0
2134275	99	51	45,4	cyclictest	2400141	-21	latency_hist	11:35:01	1
2134271	99	51	46,4	cyclictest	2134118	-21	kworker/u8:2+flush-8:0	07:26:11	0
2134271	99	51	46,3	cyclictest	2330595	-21	kworker/u8:0+events_unbound	10:41:27	0
2134271	99	51	41,8	cyclictest	2454852	-21	apt-get	12:31:04	0
2134271	99	50	45,3	cyclictest	2196796	-21	kworker/u8:0+events_unbound	08:20:01	0
2134271	99	50	43,4	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	11:11:19	0
2134271	99	50	43,4	cyclictest	2231381	-21	kworker/u8:3+events_unbound	08:46:08	0
2134271	99	50	39,8	cyclictest	2374084	-21	ntpq	11:06:18	0
2134271	99	48	41,5	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	09:46:18	0
2134271	99	48	41,4	cyclictest	2245819	-21	kworker/u8:0+events_unbound	09:36:21	0
2134271	99	48	38,7	cyclictest	2339458	-21	kworker/u8:1+events_unbound	12:01:20	0
2134275	99	47	35,9	cyclictest	280	-21	systemd-journal	08:35:00	1
2134271	99	47	44,2	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	09:01:23	0
2134271	99	47	44,1	cyclictest	2176553	-21	kworker/u8:2+events_unbound	08:01:11	0
2134271	99	47	42,4	cyclictest	2102641	-21	kworker/u8:1+events_unbound	07:11:08	0
2134271	99	47	41,4	cyclictest	2231381	-21	kworker/u8:3+events_unbound	09:51:08	0
2134271	99	47	41,4	cyclictest	2176553	-21	kworker/u8:2+events_unbound	10:36:07	0
2134271	99	47	41,4	cyclictest	2176553	-21	kworker/u8:2+events_unbound	10:36:07	0
2134271	99	47	40,4	cyclictest	2196796	-21	kworker/u8:0+events_unbound	08:31:24	0
2134280	99	46	35,8	cyclictest	280	-21	systemd-journal	07:15:01	2
2134271	99	45	32,8	cyclictest	2146301	-21	latency_hist	07:20:01	0
2134280	99	44	38,4	cyclictest	2355119	-21	kworker/u8:3+flush-8:0	12:01:10	2
2134275	99	44	34,8	cyclictest	2160805	-21	ntpq	07:31:19	1
2134271	99	44	39,3	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	11:21:14	0
2134271	99	43	39,3	cyclictest	2231381	-21	kworker/u8:3+flush-8:0	09:26:22	0
2134271	99	43	39,3	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	08:36:22	0
2134271	99	43	35,6	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	10:21:17	0
2134275	99	42	35,6	cyclictest	2211840	-21	kworker/u8:1+flush-8:0	08:51:11	1
2134275	99	42	35,6	cyclictest	2211840	-21	kworker/u8:1+flush-8:0	08:51:11	1
2134275	99	42	33,6	cyclictest	2330365	-21	latency_hist	10:25:01	1
2134271	99	42	37,4	cyclictest	2374170	-21	kworker/u8:0+flush-8:0	11:36:23	0
2134271	99	42	37,4	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	08:56:16	0
2134271	99	42	35,5	cyclictest	2355119	-21	kworker/u8:3+flush-8:0	11:51:11	0
2134271	99	42	35,5	cyclictest	2134118	-21	kworker/u8:2+flush-8:0	07:21:19	0
2134275	99	41	34,5	cyclictest	2286279	-21	apt-get	09:41:05	1
2134271	99	41	37,3	cyclictest	2285649	-21	kworker/u8:1+events_unbound	10:16:20	0
2134271	99	41	36,3	cyclictest	2374170	-21	kworker/u8:0+events_unbound	11:16:06	0
2134271	99	41	36,3	cyclictest	2134118	-21	kworker/u8:2+events_unbound	07:31:26	0
2134271	99	41	35,4	cyclictest	2330603	-21	kworker/u8:4+events_unbound	10:26:17	0
2134271	99	41	35,4	cyclictest	2161400	-21	kworker/u8:3+events_unbound	08:11:14	0
2134271	99	41	35,3	cyclictest	2355119	-21	kworker/u8:3+events_unbound	11:56:17	0
2134275	99	40	34,4	cyclictest	2365393	-21	apt-get	11:01:05	1
2134271	99	40	34,4	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	12:16:15	0
2134271	99	40	31,7	cyclictest	2280234	-21	ntp_states	09:31:22	0
2134275	99	39	33,4	cyclictest	2161400	-21	kworker/u8:3+flush-8:0	07:46:26	1
2134275	99	39	32,5	cyclictest	2359205	-21	ntpq	10:51:18	1
2134271	99	39	35,3	cyclictest	2355119	-21	kworker/u8:3+events_unbound	12:36:24	0
2134280	99	38	27,8	cyclictest	280	-21	systemd-journal	08:19:59	2
2134275	99	38	31,5	cyclictest	2330595	-21	kworker/u8:0+flush-8:0	10:31:19	1
2134275	99	38	30,5	cyclictest	2394972	-21	latency_hist	11:30:01	1
2134271	99	38	34,3	cyclictest	2231381	-21	kworker/u8:3+flush-8:0	10:11:24	0
2134271	99	38	31,4	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	11:41:15	0
2134271	99	38	30,6	cyclictest	2399270	-21	ntpq	11:31:18	0
2134271	99	38	28,7	cyclictest	2181490	-21	latency_hist	07:55:01	0
2133943	2	38	4,10	sleep1	0	-21	swapper/1	07:08:13	1
2134275	99	37	32,4	cyclictest	2176553	-21	kworker/u8:2+events_unbound	08:56:19	1
2134275	99	37	32,3	cyclictest	2245819	-21	kworker/u8:0+events_unbound	09:06:09	1
2134275	99	37	28,7	cyclictest	2281320	-21	/usr/sbin/munin	09:36:17	1
2134271	99	37	33,3	cyclictest	2355119	-21	kworker/u8:3+flush-8:0	12:26:14	0
2134271	99	37	33,3	cyclictest	2355119	-21	kworker/u8:3+flush-8:0	12:26:14	0
2134271	99	37	33,3	cyclictest	2176553	-21	kworker/u8:2+flush-8:0	10:51:23	0
2134271	99	37	32,3	cyclictest	2424863	-21	kworker/u8:2+events_unbound	12:15:00	0
2134271	99	37	32,3	cyclictest	2374170	-21	kworker/u8:0+events_unbound	11:46:09	0
2134271	99	37	32,3	cyclictest	2196796	-21	kworker/u8:0+events_unbound	08:21:22	0
2134280	99	36	30,4	cyclictest	2161400	-21	kworker/u8:3+flush-8:0	07:46:23	2
2134275	99	36	32,3	cyclictest	2161400	-21	kworker/u8:3+flush-8:0	07:51:15	1
2134275	99	36	31,4	cyclictest	2330595	-21	kworker/u8:0+events_unbound	10:41:25	1
2134275	99	36	29,6	cyclictest	2339458	-21	kworker/u8:1+flush-8:0	10:56:20	1
2134275	99	36	28,6	cyclictest	2415290	-21	apt-get	11:51:05	1
2134275	99	36	26,7	cyclictest	280	-21	systemd-journal	09:15:31	1
2134271	99	36	31,4	cyclictest	2231381	-21	kworker/u8:3+events_unbound	09:16:21	0
2134271	99	36	25,7	cyclictest	2196796	-21	kworker/u8:0+events_unbound	08:41:06	0
2133451	2	36	4,9	sleep2	0	-21	swapper/2	07:06:30	2
2134280	99	35	30,3	cyclictest	2139197	-21	systemd-run	07:14:59	2
2134275	99	35	29,4	cyclictest	2424863	-21	kworker/u8:2+events_unbound	12:06:07	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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