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 Wed Jan 28, 2026 07:55:23)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1876691	99	69	59,8	cyclictest	124	50	irq/32-eth0	06:14:24	0
1876691	99	66	29,27	cyclictest	2123742	-21	od	05:40:53	0
1876692	99	55	46,6	cyclictest	2106801	-21	fschecks_count	05:40:01	1
1876692	99	53	44,6	cyclictest	2119557	-21	sh	05:40:43	1
1876692	99	53	42,7	cyclictest	2698376	-21	od	06:10:37	1
1876693	99	52	46,3	cyclictest	0	-21	swapper/2	06:10:35	2
1876691	99	51	35,13	cyclictest	2675566	-21	sh	06:09:26	0
1876693	99	50	42,5	cyclictest	2189576	-21	execl	05:50:08	2
1876692	99	50	41,6	cyclictest	1879904	-21	Run	05:15:01	1
1876692	99	49	41,5	cyclictest	2628032	-21	sh	06:07:33	1
1876692	99	49	40,5	cyclictest	2188713	-21	execl	05:50:02	1
1876691	99	49	37,9	cyclictest	2106685	-21	modprobe	05:40:01	0
1876693	99	48	40,5	cyclictest	2686968	-21	sh	06:09:55	2
1876693	99	48	40,5	cyclictest	2108999	-21	sh	05:40:10	2
1876693	99	48	39,6	cyclictest	1879896	-21	cron	05:15:01	2
1876691	99	48	2,27	cyclictest	2189578	-21	execl	05:50:10	0
1876693	99	47	40,4	cyclictest	0	-21	swapper/2	05:15:04	2
1876693	99	47	28,12	cyclictest	0	-21	swapper/2	06:00:08	2
1876693	99	47	28,12	cyclictest	0	-21	swapper/2	06:00:08	2
1876691	99	47	38,7	cyclictest	2764284	-21	systemctl	06:40:00	0
1876692	99	46	39,4	cyclictest	2190326	-21	fstime	05:55:09	1
1876693	99	44	36,5	cyclictest	2106756	-21	forks	05:40:01	2
1876693	99	44	19,4	cyclictest	17	1	rcu_preempt	05:30:10	2
1876692	99	44	36,5	cyclictest	2189578	-21	execl	05:50:07	1
1876691	99	44	38,4	cyclictest	2193746	-21	Run	06:02:09	0
1876691	99	44	38,4	cyclictest	2193746	-21	Run	06:02:09	0
1876691	99	43	1,38	cyclictest	1880316	-21	ntpq	05:15:04	0
1876693	99	42	34,5	cyclictest	1882228	-21	mailstats	05:20:13	2
1876693	99	42	32,7	cyclictest	2758516	-21	sendmail	06:20:01	2
1876691	99	42	25,14	cyclictest	0	-21	swapper/0	05:45:08	0
1876691	99	42	1,36	cyclictest	1885177	-21	ntpq	05:30:08	0
1876692	99	41	33,5	cyclictest	1884632	-21	systemctl	05:30:01	1
1876691	99	41	26,13	cyclictest	2758457	-21	latency	06:20:01	0
1876691	99	41	2,34	cyclictest	1878782	-21	ntpq	05:10:08	0
1876691	99	41	1,36	cyclictest	2760496	-21	ntpq	06:25:10	0
1876691	99	41	1,35	cyclictest	2758918	-21	ntpq	06:20:07	0
1876691	99	40	19,19	cyclictest	0	-21	swapper/0	05:59:54	0
1876693	99	39	31,5	cyclictest	0	-21	swapper/2	05:49:54	2
1876692	99	39	31,5	cyclictest	1881127	-21	whetstone-doubl	05:20:01	1
1876692	99	39	30,6	cyclictest	2283355	-21	spawn	06:03:08	1
1876692	99	39	30,6	cyclictest	2283355	-21	spawn	06:03:08	1
1876691	99	39	14,22	cyclictest	1883048	-21	fschecks_time	05:25:01	0
1876691	99	39	1,33	cyclictest	2761932	-21	ntpq	06:30:08	0
1876691	99	39	1,33	cyclictest	2761932	-21	ntpq	06:30:08	0
1876691	99	39	13,20	cyclictest	564	-21	dbus-daemon	05:25:10	0
1876691	99	39	1,23	cyclictest	1877019	-21	awk	05:05:06	0
1876693	99	38	30,5	cyclictest	1884726	-21	cat	05:30:02	2
1876693	99	37	29,5	cyclictest	2764261	-21	cron	06:40:00	2
1876692	99	37	28,7	cyclictest	28	-21	ksoftirqd/1	06:25:11	1
1876693	99	36	26,7	cyclictest	2760075	-21	missed_timers	06:25:02	2
1876692	99	36	30,3	cyclictest	0	-21	swapper/1	06:35:03	1
1876692	99	36	30,3	cyclictest	0	-21	swapper/1	06:35:03	1
1876692	99	36	28,5	cyclictest	1883027	-21	systemd-run	05:25:01	1
1876691	99	36	29,4	cyclictest	1876704	-21	systemd-run	05:05:03	0
1876693	99	35	25,7	cyclictest	2191863	-21	fstime	05:57:01	2
1876692	99	35	29,3	cyclictest	0	-21	swapper/1	05:35:01	1
1876692	99	35	25,6	cyclictest	2764321	-21	unin-run	06:40:01	1
1876692	99	32	27,2	cyclictest	0	-21	swapper/1	06:20:01	1
1876692	99	32	24,5	cyclictest	1876704	-21	systemd-run	05:05:03	1
1876693	99	31	8,4	cyclictest	0	-21	swapper/2	06:25:10	2
1876693	99	29	21,5	cyclictest	1878206	-21	fschecks_count	05:10:01	2
1876693	99	29	16,3	cyclictest	17	1	rcu_preempt	06:30:07	2
1876693	99	29	16,3	cyclictest	17	1	rcu_preempt	06:30:07	2
1876692	99	27	14,3	cyclictest	17	1	rcu_preempt	06:21:50	1
1876693	99	25	20,2	cyclictest	0	-21	swapper/2	05:05:04	2
1876692	99	23	15,5	cyclictest	1878206	-21	fschecks_count	05:10:01	1
1876694	99	20	4,9	cyclictest	0	-21	swapper/3	06:10:25	3
1876694	99	19	3,11	cyclictest	0	-21	swapper/3	06:03:18	3
1876694	99	19	3,11	cyclictest	0	-21	swapper/3	06:03:18	3
1876694	99	19	2,9	cyclictest	0	-21	swapper/3	05:45:07	3
1876694	99	19	10,7	cyclictest	0	-21	swapper/3	05:40:12	3
1876694	99	18	2,9	cyclictest	0	-21	swapper/3	06:10:01	3
1876694	99	18	2,9	cyclictest	0	-21	swapper/3	05:50:07	3
1876694	99	17	2,9	cyclictest	0	-21	swapper/3	05:57:34	3
1876694	99	17	2,8	cyclictest	0	-21	swapper/3	06:40:00	3
1876694	99	16	2,6	cyclictest	0	-21	swapper/3	05:30:09	3
1876694	99	15	3,7	cyclictest	0	-21	swapper/3	06:17:57	3
1876694	99	15	1,7	cyclictest	0	-21	swapper/3	05:10:09	3
1876694	99	14	7,5	cyclictest	0	-21	swapper/3	05:25:01	3
1876694	99	14	1,7	cyclictest	0	-21	swapper/3	05:05:10	3
1876694	99	13	2,6	cyclictest	0	-21	swapper/3	05:15:04	3
1876694	99	13	2,5	cyclictest	0	-21	swapper/3	05:35:06	3
1876694	99	13	1,8	cyclictest	0	-21	swapper/3	06:25:02	3
1876694	99	12	1,7	cyclictest	0	-21	swapper/3	06:30:05	3
1876694	99	12	1,7	cyclictest	0	-21	swapper/3	06:30:05	3
1876694	99	11	6,3	cyclictest	0	-21	swapper/3	06:25:04	3
1876694	99	11	1,7	cyclictest	42	1	rcuc/3	05:05:02	3
1876694	99	11	1,5	cyclictest	0	-21	swapper/3	05:25:08	3
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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