OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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.
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 792 highest latencies:

System rack2slot7s.osadl.org (updated Sat Feb 07, 2026 07:55:17)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
554275	99	89	75,10	cyclictest	1361219	-21	sh	06:10:07	0
554275	99	89	75,10	cyclictest	1361219	-21	sh	06:10:07	0
554278	99	61	52,5	cyclictest	1360449	-21	tee	06:10:04	2
554278	99	61	52,5	cyclictest	1360449	-21	tee	06:10:04	2
554275	99	60	30,27	cyclictest	1428022	-21	sort	06:12:50	0
554275	99	55	39,14	cyclictest	864733	-21	execl	05:50:21	0
554275	99	52	43,6	cyclictest	124	50	irq/32-eth0	05:20:11	0
554275	99	52	28,21	cyclictest	840948	-21	multi.sh	05:42:38	0
554275	99	52	28,21	cyclictest	840948	-21	multi.sh	05:42:38	0
554277	99	50	40,6	cyclictest	1359824	-21	kworker/u8:10+xprtiod	06:10:20	1
554275	99	50	41,6	cyclictest	436569	-21	cups-browsed	05:55:15	0
554278	99	49	41,5	cyclictest	1362210	-21	tee	06:10:10	2
554277	99	49	41,5	cyclictest	1300941	-21	multi.sh	06:07:39	1
554277	99	49	41,5	cyclictest	1300941	-21	multi.sh	06:07:39	1
554277	99	48	39,6	cyclictest	0	-21	swapper/1	05:50:18	1
554278	99	47	39,5	cyclictest	834923	-21	sh	05:42:21	2
554278	99	47	39,5	cyclictest	834923	-21	sh	05:42:21	2
554278	99	46	37,5	cyclictest	558794	-21	whetstone-doubl	05:20:00	2
554277	99	46	39,4	cyclictest	864172	-21	execl	05:50:01	1
554277	99	46	39,4	cyclictest	864172	-21	execl	05:50:01	1
554277	99	46	37,6	cyclictest	1432555	-21	awk	06:20:02	1
554275	99	46	34,9	cyclictest	557065	-21	Run	05:30:09	0
554275	99	46	20,23	cyclictest	912462	-21	spawn	06:02:59	0
554277	99	45	36,6	cyclictest	791622	-21	grep	05:40:31	1
554277	99	45	36,6	cyclictest	791622	-21	grep	05:40:31	1
554275	99	45	38,4	cyclictest	564	-21	dbus-daemon	05:40:01	0
554275	99	45	2,6	cyclictest	1431935	-21	ntpq	06:15:14	0
554275	99	45	21,20	cyclictest	864521	-21	latency_hist	05:50:04	0
554275	99	45	21,20	cyclictest	864521	-21	latency_hist	05:50:04	0
554275	99	45	1,10	cyclictest	1434925	-21	ntpq	06:25:11	0
554277	99	44	36,5	cyclictest	869234	-21	Run	06:02:24	1
554277	99	44	36,5	cyclictest	784057	-21	munin-plugin-st	05:40:00	1
554278	99	43	35,5	cyclictest	865815	-21	cron	05:55:01	2
554278	99	43	35,5	cyclictest	864170	-21	execl	05:50:02	2
554278	99	43	35,5	cyclictest	864170	-21	execl	05:50:02	2
554275	99	43	1,5	cyclictest	1436416	-21	ntpq	06:30:10	0
554278	99	42	33,6	cyclictest	784284	-21	latency_hist	05:40:02	2
554275	99	42	2,6	cyclictest	561362	-21	ntpq	05:25:16	0
554275	99	42	2,5	cyclictest	554976	-21	ntpq	05:05:11	0
554275	99	42	1,14	cyclictest	556524	-21	ntpq	05:10:15	0
554275	99	41	34,4	cyclictest	1434140	-21	aten_r2power_cu	06:25:02	0
554277	99	40	32,5	cyclictest	560568	-21	latency_hist	05:25:02	1
554275	99	40	1,10	cyclictest	1437919	-21	ntpq	06:35:11	0
554275	99	40	0,10	cyclictest	558050	-21	ntpq	05:15:14	0
554277	99	39	31,4	cyclictest	0	-21	swapper/1	05:05:01	1
554275	99	39	2,32	cyclictest	554369	-21	df	05:05:02	0
554278	99	38	30,5	cyclictest	1267427	-21	spawn	06:04:24	2
554278	99	37	29,5	cyclictest	561975	-21	cat	05:30:01	2
554278	99	37	14,7	cyclictest	36	-21	ksoftirqd/2	05:35:01	2
554277	99	36	28,5	cyclictest	1434600	-21	fschecks_time	06:25:06	1
554278	99	35	29,3	cyclictest	0	-21	swapper/2	05:57:51	2
554278	99	35	28,4	cyclictest	1359824	-21	kworker/u8:10-xprtiod	06:25:03	2
554278	99	35	26,6	cyclictest	3606321	-21	systemd-journal	05:25:01	2
554278	99	34	9,14	cyclictest	36	-21	ksoftirqd/2	05:10:02	2
554278	99	33	27,3	cyclictest	0	-21	swapper/2	06:30:01	2
554278	99	33	27,3	cyclictest	0	-21	swapper/2	05:15:00	2
554278	99	33	23,3	cyclictest	17	1	rcu_preempt	05:05:02	2
554277	99	33	9,5	cyclictest	28	-21	ksoftirqd/1	05:05:14	1
554277	99	33	28,2	cyclictest	0	-21	swapper/1	05:15:01	1
554277	99	33	27,3	cyclictest	0	-21	swapper/1	06:00:02	1
554277	99	33	22,7	cyclictest	436569	-21	cups-browsed	06:35:14	1
554278	99	32	26,3	cyclictest	0	-21	swapper/2	06:20:01	2
554278	99	32	25,4	cyclictest	1436974	-21	unixbench_singl	06:30:23	2
554277	99	32	5,4	cyclictest	28	-21	ksoftirqd/1	06:30:12	1
554277	99	32	25,4	cyclictest	563006	-21	ps	05:30:23	1
554277	99	32	24,5	cyclictest	1434127	-21	systemd-run	06:25:02	1
554277	99	31	23,5	cyclictest	562183	-21	latency_hist	05:30:04	1
554278	99	30	8,6	cyclictest	36	-21	ksoftirqd/2	06:35:11	2
554277	99	30	12,5	cyclictest	28	-21	ksoftirqd/1	05:20:01	1
554281	99	21	4,8	cyclictest	0	-21	swapper/3	06:10:06	3
554281	99	21	4,8	cyclictest	0	-21	swapper/3	06:10:06	3
554281	99	17	1,6	cyclictest	0	-21	swapper/3	05:30:20	3
554281	99	16	6,6	cyclictest	0	-21	swapper/3	06:10:24	3
554281	99	16	2,6	cyclictest	0	-21	swapper/3	05:40:25	3
554281	99	16	2,6	cyclictest	0	-21	swapper/3	05:40:25	3
554281	99	16	2,5	cyclictest	0	-21	swapper/3	05:25:13	3
554281	99	15	8,5	cyclictest	0	-21	swapper/3	05:50:21	3
554281	99	14	2,8	cyclictest	0	-21	swapper/3	06:00:13	3
554281	99	14	2,5	cyclictest	0	-21	swapper/3	06:35:12	3
554281	99	14	2,5	cyclictest	0	-21	swapper/3	05:45:11	3
554281	99	14	2,5	cyclictest	0	-21	swapper/3	05:45:11	3
554281	99	14	1,7	cyclictest	0	-21	swapper/3	05:55:19	3
554281	99	14	1,6	cyclictest	0	-21	swapper/3	05:15:10	3
554281	99	14	1,6	cyclictest	0	-21	swapper/3	05:10:14	3
554281	99	14	1,5	cyclictest	0	-21	swapper/3	06:15:12	3
554281	99	14	1,5	cyclictest	0	-21	swapper/3	05:35:12	3
554281	99	14	1,5	cyclictest	0	-21	swapper/3	05:05:11	3
554281	99	13	1,5	cyclictest	0	-21	swapper/3	06:25:11	3
554281	99	12	2,5	cyclictest	0	-21	swapper/3	06:30:10	3
554281	99	11	1,6	cyclictest	0	-21	swapper/3	05:20:13	3
554281	99	11	1,5	cyclictest	0	-21	swapper/3	06:20:13	3
554281	99	9	2,5	cyclictest	0	-21	swapper/3	05:05:02	3
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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