OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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

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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
Compare latency of primary with shadow system

Characteristics of all highest latencies:

System rackeslot4s.osadl.org (updated Wed Feb 11, 2026 12:44:05)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2635355	99	38	32,4	cyclictest	2964885	-21	latency_hist	12:25:01	3
2635347	99	35	30,3	cyclictest	2959832	-21	base64	12:20:00	1
2635355	99	31	27,2	cyclictest	2834001	-21	kworker/u8:2+flush-259:0	10:45:16	3
2635345	99	31	26,3	cyclictest	2792351	-21	kworker/u8:4+flush-259:0	09:45:24	0
2635345	99	30	26,3	cyclictest	2881885	-21	kworker/u8:1+events_unbound	11:25:22	0
2635350	99	29	18,10	cyclictest	2886826	-21	cron	11:10:00	2
2635347	99	29	24,4	cyclictest	2923500	-21	/usr/sbin/munin	11:45:15	1
2635345	99	29	26,2	cyclictest	2771535	-21	kworker/u8:1+flush-259:0	10:10:23	0
2635345	99	29	25,3	cyclictest	2740134	-21	kworker/u8:3+flush-259:0	09:25:25	0
2635345	99	29	25,3	cyclictest	2708577	-21	kworker/u8:0+flush-259:0	08:40:23	0
2635345	99	29	24,3	cyclictest	252	-21	systemd-journal	07:25:07	0
2635347	99	28	23,3	cyclictest	2923281	-21	kworker/u8:3+flush-259:0	11:55:11	1
2635345	99	28	25,2	cyclictest	2740134	-21	kworker/u8:3+flush-259:0	09:40:01	0
2635355	99	27	23,3	cyclictest	2740134	-21	kworker/u8:3+flush-259:0	09:30:15	3
2635350	99	27	22,3	cyclictest	2854796	-21	apt-get	10:40:12	2
2635355	99	26	20,4	cyclictest	2693400	-21	diskstats	08:05:14	3
2635347	99	26	17,8	cyclictest	0	-21	swapper/1	07:15:01	1
2635355	99	25	19,4	cyclictest	2844469	-21	/usr/sbin/munin	10:30:13	3
2635355	99	25	18,5	cyclictest	2823249	-21	http	10:10:00	3
2635347	99	25	19,4	cyclictest	2954197	-21	latency_hist	12:15:01	1
2635345	99	25	21,3	cyclictest	2645600	-21	kworker/u8:0+events_unbound	07:40:12	0
2635355	99	24	20,3	cyclictest	2645600	-21	kworker/u8:0+flush-259:0	07:25:17	3
2635350	99	24	22,1	cyclictest	2949054	-21	cut	12:10:00	2
2635347	99	24	9,2	cyclictest	2865264	-21	idleruntime-cro	10:50:00	1
2635345	99	24	20,3	cyclictest	2881885	-21	kworker/u8:1+flush-259:0	11:40:18	0
2635350	99	23	20,2	cyclictest	2650868	-21	turbostat.cron	07:25:00	2
2635345	99	23	20,2	cyclictest	2708577	-21	kworker/u8:0+flush-259:0	08:20:14	0
2635345	99	23	19,3	cyclictest	2834001	-21	kworker/u8:2+events_unbound	10:30:24	0
2635345	99	23	17,4	cyclictest	252	-21	systemd-journal	11:03:26	0
2635345	99	23	16,5	cyclictest	2640950	-21	diskstats	07:15:14	0
2635355	99	22	15,4	cyclictest	2635273	-21	latency_hist	07:10:00	3
2635347	99	22	16,4	cyclictest	252	-21	systemd-journal	11:37:07	1
2635345	99	22	18,3	cyclictest	2923281	-21	kworker/u8:3+flush-259:0	12:10:24	0
2635345	99	22	18,3	cyclictest	2650885	-21	kworker/u8:3+flush-259:0	07:35:00	0
2635345	99	22	17,3	cyclictest	2907034	-21	kworker/u8:0+events_unbound	11:30:19	0
2635350	99	21	16,3	cyclictest	2876162	-21	gpgv	11:00:00	2
2635350	99	21	16,3	cyclictest	252	-21	systemd-journal	11:40:00	2
2635347	99	21	17,3	cyclictest	2645600	-21	kworker/u8:0+events_unbound	07:40:17	1
2635347	99	21	16,4	cyclictest	2677517	-21	kworker/u8:3+flush-259:0	07:50:16	1
2635345	99	21	17,3	cyclictest	2923281	-21	kworker/u8:3+events_unbound	11:50:21	0
2635345	99	21	17,3	cyclictest	2708577	-21	kworker/u8:0+events_unbound	08:58:08	0
2635355	99	20	16,3	cyclictest	2813554	-21	irqcore	10:00:15	3
2635355	99	20	16,2	cyclictest	2918130	-21	cron	11:40:00	3
2635355	99	20	16,2	cyclictest	0	-21	swapper/3	12:30:01	3
2635355	99	20	14,4	cyclictest	2823919	-21	apt-get	10:10:11	3
2635355	99	20	13,5	cyclictest	2651292	-21	cat	07:25:01	3
2635350	99	20	17,2	cyclictest	2724280	-21	munin-plugin-st	08:34:59	2
2635350	99	20	16,3	cyclictest	2938971	-21	kworker/u8:1+flush-259:0	12:00:18	2
2635350	99	20	14,4	cyclictest	2870839	-21	cat	10:55:01	2
2635347	99	20	2,9	cyclictest	0	-21	swapper/1	11:10:00	1
2635347	99	20	13,5	cyclictest	2902278	-21	latency_hist	11:25:01	1
2635345	99	20	17,2	cyclictest	2923281	-21	kworker/u8:3+flush-259:0	12:30:24	0
2635345	99	20	17,2	cyclictest	2834001	-21	kworker/u8:2+events_unbound	10:40:22	0
2635345	99	20	16,3	cyclictest	2907034	-21	kworker/u8:0+events_unbound	11:36:06	0
2635345	99	20	16,3	cyclictest	2761392	-21	kworker/u8:2+events_unbound	09:15:07	0
2635345	99	20	16,3	cyclictest	2661607	-21	kworker/u8:4+events_unbound	07:55:18	0
2635345	99	20	16,3	cyclictest	2661607	-21	kworker/u8:4+events_unbound	07:40:01	0
2635345	99	20	14,4	cyclictest	2698985	-21	diskstats	08:10:14	0
2635355	99	19	13,4	cyclictest	252	-21	systemd-journal	08:38:04	3
2635350	99	19	13,4	cyclictest	252	-21	systemd-journal	08:05:00	2
2635347	99	19	14,3	cyclictest	509	-21	rs:main		1
2635345	99	19	15,3	cyclictest	2635529	-21	kworker/u8:2+events_unbound	07:45:15	0
2635345	99	19	15,2	cyclictest	1	-21	systemd	10:27:06	0
2635355	99	18	11,5	cyclictest	2886018	-21	ntpq	11:05:22	3
2635355	99	18	0,17	cyclictest	2750457	-21	unin-run	09:00:00	3
2635350	99	18	13,4	cyclictest	2702812	-21	ntpq	08:10:20	2
2635347	99	18	15,2	cyclictest	1	-21	systemd	08:41:07	1
2635347	99	18	14,3	cyclictest	2859783	-21	gpgv	10:44:59	1
2635345	99	18	15,2	cyclictest	2807673	-21	sh	09:55:01	0
2635345	99	18	14,3	cyclictest	2771535	-21	kworker/u8:1+flush-259:0	09:40:18	0
2635345	99	18	14,3	cyclictest	2740134	-21	kworker/u8:3+events_unbound	09:10:18	0
2635345	99	18	14,3	cyclictest	2713989	-21	kworker/u8:1+flush-259:0	08:38:14	0
2635345	99	18	12,4	cyclictest	2865543	-21	apt-get	10:50:11	0
2635355	99	17	13,3	cyclictest	2902271	-21	idleruntime-cro	11:25:00	3
2635355	99	17	12,3	cyclictest	2740137	-21	kworker/u8:4+events_unbound	08:55:01	3
2635355	99	17	11,4	cyclictest	2677517	-21	kworker/u8:3+flush-259:0	08:19:59	3
2635350	99	17	12,4	cyclictest	2933821	-21	/usr/sbin/munin	11:55:19	2
2635350	99	17	11,4	cyclictest	2959505	-21	cp	12:20:01	2
2635347	99	17	13,3	cyclictest	2823744	-21	base64	10:10:02	1
2635347	99	17	13,3	cyclictest	2761430	-21	apt-get	09:10:12	1
2635347	99	17	12,3	cyclictest	2959323	-21	apt-get	12:20:01	1
2635347	99	17	10,5	cyclictest	2817131	-21	ntpq	10:00:19	1
2635345	99	17	14,2	cyclictest	2938971	-21	kworker/u8:1+flush-259:0	12:00:16	0
2635345	99	17	14,2	cyclictest	2713989	-21	kworker/u8:1+flush-259:0	08:25:17	0
2635345	99	17	13,3	cyclictest	2923281	-21	kworker/u8:3+flush-259:0	11:45:26	0
2635345	99	17	13,3	cyclictest	2891633	-21	kworker/u8:0+events_unbound	11:15:26	0
2635345	99	17	13,3	cyclictest	2740134	-21	kworker/u8:3+flush-259:0	09:55:17	0
2635345	99	17	13,3	cyclictest	2740134	-21	kworker/u8:3+events_unbound	09:05:15	0
2635345	99	17	13,3	cyclictest	2740134	-21	kworker/u8:3+events_unbound	09:01:08	0
2635345	99	17	13,3	cyclictest	2729853	-21	kworker/u8:2+events_unbound	08:45:18	0
2635345	99	17	12,4	cyclictest	2923281	-21	kworker/u8:3+events_unbound	12:35:15	0
2635345	99	17	12,4	cyclictest	2849615	-21	apt-get	10:35:13	0
2635355	99	16	8,6	cyclictest	2723358	-21	ntpq	08:30:20	3
2635355	99	16	13,2	cyclictest	2676517	-21	needreboot	07:45:16	3
2635355	99	16	12,3	cyclictest	2713989	-21	kworker/u8:1+flush-259:0	08:25:21	3
2635355	99	16	11,3	cyclictest	2740134	-21	kworker/u8:3+flush-259:0	09:05:17	3
2635350	99	16	13,2	cyclictest	2923281	-21	kworker/u8:3+events_unbound	12:30:19	2
2635347	99	16	13,2	cyclictest	0	-21	swapper/1	10:34:59	1
2635347	99	16	12,3	cyclictest	2714263	-21	apt-get	08:25:10	1
2635347	99	16	10,5	cyclictest	2806823	-21	ntpq	09:50:20	1
2635345	99	16	14,1	cyclictest	611	50	irq/133-enp0s29f1:tx-0	10:00:21	0
2635345	99	16	14,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	08:06:59	0
2635345	99	16	12,3	cyclictest	603	50	irq/132-enp0s29f1:rx-0	12:20:16	0
2635345	99	16	12,3	cyclictest	2923281	-21	kworker/u8:3+events_unbound	12:25:13	0
2635345	99	16	12,3	cyclictest	2859688	-21	kworker/u8:4+events_unbound	11:08:26	0
2635345	99	16	12,3	cyclictest	2771535	-21	kworker/u8:1+events_unbound	09:23:13	0
2635345	99	16	12,2	cyclictest	2833151	-21	ntp_offset	10:15:21	0
2635345	99	16	11,4	cyclictest	2740134	-21	kworker/u8:3+events_unbound	09:30:09	0
2635355	99	15	12,2	cyclictest	2918527	-21	cpuspeed_turbos	11:40:13	3
2635355	99	15	12,2	cyclictest	2887083	-21	/usr/sbin/munin	11:10:20	3
2635355	99	15	12,2	cyclictest	2810265	-21	kthreadcore	09:55:18	3
2635355	99	15	12,2	cyclictest	2713985	-21	idleruntime-cro	08:25:00	3
2635355	99	15	11,3	cyclictest	2975399	-21	/usr/sbin/munin	12:35:14	3
2635355	99	15	10,4	cyclictest	2734957	-21	latency_hist	08:45:00	3
2635355	99	15	0,4	cyclictest	2902545	2	apt	11:25:10	3
2635350	99	15	13,1	cyclictest	0	-21	swapper/2	08:00:01	2
2635350	99	15	11,3	cyclictest	2892223	-21	apt-get	11:15:10	2
2635350	99	15	10,4	cyclictest	252	-21	systemd-journal	09:55:00	2
2635347	99	15	9,4	cyclictest	2761166	-21	latency_hist	09:10:00	1
2635347	99	15	12,2	cyclictest	2791650	-21	unixbench_multi	09:35:24	1
2635347	99	15	11,3	cyclictest	2876045	-21	apt-get	11:00:02	1
2635345	99	15	14,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	11:10:26	0
2635345	99	15	13,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	10:20:16	0
2635345	99	15	13,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	08:00:28	0
2635345	99	15	13,1	cyclictest	0	-21	swapper/0	10:59:59	0
2635345	99	15	12,2	cyclictest	603	50	irq/132-enp0s29f1:rx-0	11:20:20	0
2635345	99	15	12,2	cyclictest	603	50	irq/132-enp0s29f1:rx-0	08:30:40	0
2635345	99	15	12,2	cyclictest	2792351	-21	kworker/u8:4+events_unbound	10:05:22	0
2635345	99	15	12,2	cyclictest	2704395	-21	irqcore	08:15:17	0
2635355	99	14	11,2	cyclictest	2865505	-21	kworker/u8:0+flush-259:0	10:55:16	3
2635355	99	14	10,2	cyclictest	0	-21	swapper/3	11:19:59	3
2635350	99	14	6,6	cyclictest	2911659	-21	ntpq	11:30:21	2
2635350	99	14	11,2	cyclictest	2734535	-21	unixbench_singl	08:40:24	2
2635350	99	14	10,3	cyclictest	2849365	-21	kworker/u8:1+flush-259:0	10:35:18	2
2635347	99	14	11,2	cyclictest	2740137	-21	kworker/u8:4+flush-259:0	08:55:16	1
2635347	99	14	0,2	cyclictest	2933591	-21	grep	11:54:59	1
2635345	99	14	12,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	11:55:44	0
2635345	99	14	12,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	10:45:25	0
2635345	99	14	12,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	07:50:16	0
2635345	99	14	12,1	cyclictest	603	50	irq/132-enp0s29f1:rx-0	07:20:18	0
2635345	99	14	10,3	cyclictest	2938971	-21	kworker/u8:1+flush-259:0	12:15:16	0
2635345	99	14	10,3	cyclictest	2740137	-21	kworker/u8:4+events_unbound	08:50:14	0
2635355	99	13	9,2	cyclictest	0	-21	swapper/3	10:55:00	3
2635355	99	13	7,4	cyclictest	2766374	-21	latency_hist	09:15:00	3
2635355	99	13	6,5	cyclictest	2792125	-21	latency_hist	09:40:00	3
2635355	99	13	10,2	cyclictest	2937014	-21	kthreadcore	11:55:16	3
2635355	99	13	10,2	cyclictest	2877756	-21	kthreadcore	11:00:16	3
2635355	99	13	10,2	cyclictest	2677863	-21	cpuspeed_turbos	07:50:11	3
2635350	99	13	9,3	cyclictest	252	-21	systemd-journal	09:08:07	2
2635350	99	13	7,4	cyclictest	2881644	-21	awk	11:04:59	2
2635350	99	13	11,1	cyclictest	2755903	-21	latency_hist	09:05:01	2
2635350	99	13	11,1	cyclictest	2709511	-21	irqcore	08:20:17	2
2635350	99	13	11,1	cyclictest	0	-21	swapper/2	11:50:00	2
2635350	99	13	10,2	cyclictest	2817582	-21	unixbench_singl	10:00:23	2
2635350	99	13	10,2	cyclictest	2781354	-21	unixbench_multi	09:25:24	2
2635350	99	13	10,2	cyclictest	2656786	-21	cpuspeed_turbos	07:30:13	2
2635350	99	13	0,6	cyclictest	2954207	-21	munin-run	12:15:00	2
2635347	99	13	9,3	cyclictest	2771535	-21	kworker/u8:1+flush-259:0	09:48:17	1
2635347	99	13	9,3	cyclictest	2661607	-21	kworker/u8:4+flush-259:0	07:35:26	1
2635347	99	13	10,2	cyclictest	2839405	-21	apt-get	10:25:12	1
2635347	99	13	10,2	cyclictest	2719658	-21	fschecks_time	08:30:15	1
2635347	99	13	10,2	cyclictest	2656917	-21	fschecks_count	07:30:14	1
2635355	99	12	9,2	cyclictest	2776662	-21	idleruntime-cro	09:25:01	3
2635355	99	12	9,1	cyclictest	0	-21	swapper/3	12:20:01	3
2635355	99	12	7,3	cyclictest	2807680	-21	latency_hist	09:55:00	3
2635355	99	12	10,1	cyclictest	0	-21	swapper/3	09:30:00	3
2635355	99	12	10,1	cyclictest	0	-21	swapper/3	07:40:00	3
2635350	99	12	9,2	cyclictest	2787326	-21	cpuspeed_turbos	09:35:12	2
2635350	99	12	9,2	cyclictest	2671440	-21	ntp_kernel_pll_	07:40:21	2
2635350	99	12	8,3	cyclictest	509	-21	rs:main		2
2635350	99	12	8,3	cyclictest	2761392	-21	kworker/u8:2+flush-259:0	09:20:01	2
2635350	99	12	1,4	cyclictest	2812888	-21	munin-run	10:00:01	2
2635350	99	12	1,2	cyclictest	2980306	-21	cron	12:40:00	2
2635347	99	12	9,2	cyclictest	2912612	-21	gpgv	11:35:00	1
2635347	99	12	8,3	cyclictest	2771535	-21	kworker/u8:1+flush-259:0	09:25:17	1
2635347	99	12	7,4	cyclictest	252	-21	systemd-journal	08:10:01	1
2635347	99	12	7,3	cyclictest	2834245	-21	apt-get	10:20:11	1
2635347	99	12	7,3	cyclictest	252	-21	systemd-journal	11:19:07	1
2635347	99	12	7,3	cyclictest	252	-21	systemd-journal	07:16:59	1
2635347	99	12	6,1	cyclictest	0	-21	swapper/1	08:25:00	1
2635347	99	12	3,1	cyclictest	0	-21	swapper/1	10:35:26	1
2635347	99	12	10,1	cyclictest	2907425	-21	sh	11:29:59	1
2635355	99	11	7,3	cyclictest	2682915	-21	apt-get	07:55:12	3
2635355	99	11	7,3	cyclictest	2677517	-21	kworker/u8:3+flush-259:0	08:00:25	3
2635355	99	11	5,4	cyclictest	2802312	-21	sshd	09:48:07	3
2635355	99	11	5,4	cyclictest	252	-21	systemd-journal	09:45:00	3
2635350	99	11	9,1	cyclictest	2929094	-21	irqcore	11:50:16	2
2635350	99	11	9,1	cyclictest	2772184	-21	grep	09:20:15	2
2635350	99	11	8,2	cyclictest	0	-21	swapper/2	10:45:20	2
2635350	99	11	0,9	cyclictest	2828824	-21	idleruntime-cro	10:15:01	2
2635347	99	11	9,1	cyclictest	0	-21	swapper/1	12:30:01	1
2635347	99	11	9,1	cyclictest	0	-21	swapper/1	09:45:01	1
2635347	99	11	0,2	cyclictest	2650866	-21	awk	07:25:00	1
2635355	99	10	8,1	cyclictest	0	-21	swapper/3	08:10:14	3
2635355	99	10	7,2	cyclictest	0	-21	swapper/3	10:40:14	3
2635355	99	10	6,2	cyclictest	2933600	-21	true	11:55:00	3
2635350	99	10	7,2	cyclictest	2834001	-21	kworker/u8:2+flush-259:0	10:25:17	2
2635350	99	10	7,2	cyclictest	2745737	-21	fschecks_count	08:55:14	2
2635350	99	10	7,2	cyclictest	2635825	-21	fschecks_time	07:10:14	2
2635347	99	10	8,1	cyclictest	0	-21	swapper/1	12:05:16	1
2635347	99	10	8,1	cyclictest	0	-21	swapper/1	08:00:17	1
2635347	99	10	7,2	cyclictest	2766703	-21	cpuspeed_turbos	09:15:14	1
2635347	99	10	7,2	cyclictest	2672824	-21	fschecks_time	07:45:11	1
2635347	99	10	5,3	cyclictest	2755758	-21	cat	09:05:01	1
2635350	99	9	7,1	cyclictest	0	-21	swapper/2	11:40:14	2
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2021-09-01 - 00:34