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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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
Compare latency of primary with shadow system

Characteristics of all highest latencies:

System rackeslot4s.osadl.org (updated Sun Nov 30, 2025 12:44:05)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
176451	99	39	35,3	cyclictest	357956	-21	kworker/u8:2+flush-259:0	11:19:59	1
176460	99	38	34,3	cyclictest	316482	-21	kworker/u8:3+flush-259:0	09:55:18	3
176452	99	37	31,4	cyclictest	378810	-21	latency_hist	10:25:01	2
176451	99	32	19,4	cyclictest	399717	-21	apt-get	10:45:14	1
176451	99	30	27,2	cyclictest	414892	-21	kworker/u8:1+flush-259:0	11:00:18	1
176448	99	30	25,3	cyclictest	316706	-21	apt-get	09:25:12	0
176452	99	29	25,3	cyclictest	357956	-21	kworker/u8:2+flush-259:0	10:40:22	2
176452	99	28	23,4	cyclictest	332123	-21	/usr/sbin/munin	09:40:13	2
176452	99	28	23,3	cyclictest	2698871	-21	systemd-journal	12:05:13	2
176452	99	27	21,4	cyclictest	2698871	-21	systemd-journal	07:51:12	2
176452	99	26	20,4	cyclictest	352564	-21	latency_hist	10:00:01	2
176448	99	26	21,4	cyclictest	440904	-21	apt-get	11:25:12	0
176448	99	26	20,4	cyclictest	497901	-21	cat	12:20:01	0
176460	99	25	21,3	cyclictest	160716	-21	kworker/u8:2+flush-259:0	07:40:16	3
176460	99	24	21,2	cyclictest	414892	-21	kworker/u8:1+events_unbound	11:15:17	3
176460	99	24	20,3	cyclictest	238260	-21	kworker/u8:2+flush-259:0	08:15:18	3
176460	99	24	20,2	cyclictest	0	-21	swapper/3	08:25:00	3
176460	99	23	20,2	cyclictest	243385	-21	kworker/u8:4+flush-259:0	08:30:23	3
176460	99	23	18,4	cyclictest	446337	-21	kworker/u8:3+flush-259:0	12:10:01	3
176460	99	23	17,4	cyclictest	285590	-21	latency_hist	08:55:01	3
176452	99	23	20,2	cyclictest	197304	-21	gpgv	07:30:01	2
176452	99	23	19,3	cyclictest	316482	-21	kworker/u8:3+flush-259:0	09:50:16	2
176452	99	23	17,4	cyclictest	3000063	-21	rs:main		2
176460	99	22	19,2	cyclictest	503	-21	systemd-logind	07:25:00	3
176460	99	22	18,3	cyclictest	181880	-21	apt-get	07:15:14	3
176460	99	22	18,3	cyclictest	176427	-21	kworker/u8:0+events_unbound	07:30:19	3
176460	99	22	16,4	cyclictest	207864	-21	latency_hist	07:40:01	3
176452	99	22	18,3	cyclictest	446337	-21	kworker/u8:3+flush-259:0	11:35:18	2
176452	99	22	16,4	cyclictest	280021	-21	latency_hist	08:50:01	2
176451	99	22	17,4	cyclictest	497393	-21	apt-get	12:20:01	1
176451	99	22	16,4	cyclictest	213030	-21	latency_hist	07:45:01	1
176451	99	22	15,5	cyclictest	337069	-21	latency_hist	09:45:01	1
176448	99	22	4,6	cyclictest	372472	-21	cut	10:15:19	0
176460	99	21	17,3	cyclictest	207886	-21	kworker/u8:3+flush-259:0	07:45:16	3
176452	99	21	17,3	cyclictest	243385	-21	kworker/u8:4+flush-259:0	08:30:17	2
176452	99	21	17,3	cyclictest	160716	-21	kworker/u8:2+flush-259:0	07:40:20	2
176448	99	21	18,1	cyclictest	0	-21	swapper/0	11:10:00	0
176448	99	21	18,1	cyclictest	0	-21	swapper/0	11:09:59	0
176448	99	21	1,18	cyclictest	2698871	-21	systemd-journal	09:55:15	0
176460	99	20	16,3	cyclictest	497702	-21	gpgv	12:20:01	3
176460	99	20	16,3	cyclictest	357956	-21	kworker/u8:2+events_unbound	10:40:02	3
176460	99	20	16,3	cyclictest	207886	-21	kworker/u8:3+events_unbound	07:50:15	3
176451	99	20	14,4	cyclictest	2698871	-21	systemd-journal	08:38:13	1
176448	99	20	4,6	cyclictest	401450	-21	cut	10:45:20	0
176448	99	20	4,6	cyclictest	207331	-21	sed	07:35:27	0
176448	99	20	4,4	cyclictest	253409	-21	ld	08:20:22	0
176448	99	20	4,4	cyclictest	201853	-21	ld	07:30:20	0
176448	99	20	17,2	cyclictest	0	-21	swapper/0	10:45:00	0
176448	99	20	16,3	cyclictest	368681	-21	kworker/u8:4+flush-259:0	10:20:19	0
176460	99	19	15,3	cyclictest	368681	-21	kworker/u8:4+events_unbound	10:30:16	3
176460	99	19	15,3	cyclictest	316482	-21	kworker/u8:3+events_unbound	09:50:24	3
176460	99	19	15,3	cyclictest	316482	-21	kworker/u8:3+events_unbound	09:35:22	3
176460	99	19	14,3	cyclictest	414892	-21	kworker/u8:1+events_unbound	11:30:14	3
176460	99	19	13,4	cyclictest	2698871	-21	systemd-journal	12:15:00	3
176460	99	19	12,5	cyclictest	269744	-21	latency_hist	08:40:01	3
176452	99	19	7,5	cyclictest	269752	-21	awk	08:40:00	2
176452	99	19	16,2	cyclictest	0	-21	swapper/2	12:25:01	2
176452	99	19	15,3	cyclictest	19017	-21	kworker/u8:1+flush-259:0	07:15:26	2
176451	99	19	14,4	cyclictest	2698871	-21	systemd-journal	08:14:59	1
176451	99	19	13,4	cyclictest	451183	-21	apt-get	11:35:13	1
176451	99	19	12,5	cyclictest	502949	-21	latency_hist	12:25:01	1
176448	99	19	4,6	cyclictest	297467	-21	cut	09:05:18	0
176448	99	19	4,4	cyclictest	306416	-21	latency_hist	09:15:01	0
176448	99	19	3,5	cyclictest	239063	-21	cpu	08:10:14	0
176448	99	19	15,3	cyclictest	414892	-21	kworker/u8:1+flush-259:0	11:00:00	0
176448	99	19	15,2	cyclictest	492490	-21	apt-get	12:15:13	0
176460	99	18	13,3	cyclictest	414892	-21	kworker/u8:1+events_unbound	11:50:23	3
176452	99	18	15,2	cyclictest	357956	-21	kworker/u8:2+flush-259:0	11:25:00	2
176452	99	18	13,3	cyclictest	476999	-21	/usr/sbin/munin	12:00:16	2
176452	99	18	12,5	cyclictest	2698871	-21	systemd-journal	07:40:00	2
176451	99	18	14,3	cyclictest	316482	-21	kworker/u8:3+flush-259:0	09:55:19	1
176448	99	18	5,4	cyclictest	0	-21	swapper/0	11:10:22	0
176448	99	18	4,5	cyclictest	449057	-21	kthreadcore	11:30:19	0
176448	99	18	4,4	cyclictest	284921	-21	sed	08:50:24	0
176448	99	18	4,4	cyclictest	258575	-21	ld	08:25:22	0
176460	99	17	14,2	cyclictest	285210	-21	kworker/u8:0+flush-259:0	09:00:16	3
176460	99	17	13,3	cyclictest	414892	-21	kworker/u8:1+events_unbound	11:00:22	3
176460	99	17	13,3	cyclictest	404586	-21	kworker/u8:0+flush-259:0	10:55:00	3
176460	99	17	13,3	cyclictest	316482	-21	kworker/u8:3+flush-259:0	10:25:26	3
176460	99	17	13,3	cyclictest	264785	-21	kworker/u8:2+events_unbound	08:45:17	3
176452	99	17	14,2	cyclictest	492900	-21	irqcore	12:15:18	2
176452	99	17	0,15	cyclictest	492	-21	dbus-daemon	10:40:00	2
176451	99	17	14,2	cyclictest	0	-21	swapper/1	07:35:00	1
176451	99	17	12,4	cyclictest	327008	-21	apt-get	09:35:12	1
176448	99	17	5,2	cyclictest	227557	-21	ntpq	07:55:21	0
176448	99	17	4,4	cyclictest	346075	-21	tr	09:50:19	0
176448	99	17	14,2	cyclictest	606	50	irq/133-enp0s29f1:rx-0	12:09:01	0
176460	99	16	8,6	cyclictest	228879	-21	diskstats	08:00:14	3
176460	99	16	13,2	cyclictest	503188	-21	kworker/u8:0+events_unbound	12:25:16	3
176460	99	16	13,2	cyclictest	414892	-21	kworker/u8:1+flush-259:0	11:40:19	3
176460	99	16	12,3	cyclictest	446337	-21	kworker/u8:3+flush-259:0	11:35:17	3
176460	99	16	12,3	cyclictest	310443	-21	ntp_kernel_pll_	09:15:24	3
176460	99	16	12,3	cyclictest	207886	-21	kworker/u8:3+events_unbound	08:10:25	3
176452	99	16	9,5	cyclictest	342261	-21	latency_hist	09:50:00	2
176452	99	16	13,2	cyclictest	410405	-21	irqcore	10:55:16	2
176452	99	16	11,4	cyclictest	446043	-21	apt-get	11:30:11	2
176452	99	16	10,4	cyclictest	503188	-21	kworker/u8:0+flush-259:0	12:30:16	2
176451	99	16	9,5	cyclictest	2698871	-21	systemd-journal	08:04:59	1
176451	99	16	13,2	cyclictest	0	-21	swapper/1	11:10:00	1
176451	99	16	13,2	cyclictest	0	-21	swapper/1	11:09:59	1
176451	99	16	12,3	cyclictest	207886	-21	kworker/u8:3+flush-259:0	08:40:20	1
176451	99	16	11,4	cyclictest	310406	-21	ntpq	09:15:22	1
176451	99	16	10,4	cyclictest	2698871	-21	systemd-journal	08:35:00	1
176448	99	16	9,5	cyclictest	491374	-21	ntpq	12:10:24	0
176448	99	16	9,5	cyclictest	2698871	-21	systemd-journal	11:05:00	0
176448	99	16	7,5	cyclictest	835	-21	runrttasks	09:04:58	0
176448	99	16	7,5	cyclictest	279961	-21	chrt	08:49:28	0
176448	99	16	6,3	cyclictest	237903	-21	collect2	08:05:22	0
176448	99	16	5,2	cyclictest	517552	-21	ntpq	12:35:21	0
176448	99	16	5,2	cyclictest	465568	-21	ntpq	11:45:22	0
176448	99	16	5,2	cyclictest	336160	-21	ntpq	09:40:19	0
176448	99	16	3,4	cyclictest	189573	-21	tr	07:20:23	0
176448	99	16	2,4	cyclictest	196285	-21	ld	07:25:22	0
176448	99	16	2,4	cyclictest	183409	-21	cut	07:15:19	0
176448	99	16	14,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	12:00:25	0
176448	99	16	14,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	11:50:21	0
176448	99	16	14,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	11:40:18	0
176448	99	16	13,2	cyclictest	606	50	irq/133-enp0s29f1:rx-0	10:25:25	0
176448	99	16	0,14	cyclictest	342277	-21	true	09:50:00	0
176460	99	15	12,2	cyclictest	234313	-21	irqcore	08:05:17	3
176460	99	15	12,2	cyclictest	228440	-21	sh	08:00:00	3
176460	99	15	11,3	cyclictest	285210	-21	kworker/u8:0+events_unbound	09:20:21	3
176460	99	15	10,3	cyclictest	0	-21	swapper/3	07:30:00	3
176452	99	15	9,4	cyclictest	2698871	-21	systemd-journal	09:23:13	2
176452	99	15	9,4	cyclictest	207886	-21	kworker/u8:3+flush-259:0	07:55:18	2
176452	99	15	12,2	cyclictest	270436	-21	irqcore	08:40:17	2
176452	99	15	11,3	cyclictest	264785	-21	kworker/u8:2+flush-259:0	09:15:01	2
176451	99	15	12,2	cyclictest	394284	-21	sh	10:40:00	1
176451	99	15	11,3	cyclictest	331902	-21	kworker/u8:0+flush-259:0	10:05:00	1
176448	99	15	9,4	cyclictest	508112	-21	latency_hist	12:30:01	0
176448	99	15	5,2	cyclictest	434641	-21	ntpq	11:15:22	0
176448	99	15	4,3	cyclictest	384952	-21	cut	10:30:19	0
176448	99	15	2,9	cyclictest	456090	-21	munin-run	11:40:00	0
176448	99	15	2,4	cyclictest	0	-21	swapper/0	07:50:22	0
176448	99	15	2,3	cyclictest	439767	-21	gcc	11:20:23	0
176448	99	15	13,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	10:52:27	0
176448	99	15	13,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	10:10:19	0
176448	99	15	13,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	09:20:30	0
176448	99	15	13,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	08:58:57	0
176448	99	15	13,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	08:30:25	0
176448	99	15	12,1	cyclictest	0	-21	swapper/0	07:15:00	0
176460	99	14	9,4	cyclictest	331902	-21	kworker/u8:0+events_unbound	10:00:22	3
176460	99	14	8,4	cyclictest	513529	-21	/usr/sbin/munin	12:35:16	3
176460	99	14	11,2	cyclictest	503188	-21	kworker/u8:0+flush-259:0	12:30:21	3
176460	99	14	10,3	cyclictest	446337	-21	kworker/u8:3+events_unbound	12:10:21	3
176452	99	14	9,4	cyclictest	2698871	-21	systemd-journal	10:10:44	2
176452	99	14	7,5	cyclictest	2698871	-21	systemd-journal	07:48:13	2
176452	99	14	11,2	cyclictest	264785	-21	kworker/u8:2+flush-259:0	08:55:24	2
176452	99	14	11,2	cyclictest	0	-21	swapper/2	09:30:16	2
176451	99	14	8,4	cyclictest	228440	-21	latency_hist	08:00:00	1
176451	99	14	11,2	cyclictest	373626	-21	sh	10:19:59	1
176451	99	14	10,3	cyclictest	373867	-21	/usr/sbin/munin	10:20:22	1
176448	99	14	8,4	cyclictest	394440	-21	sort	10:40:00	0
176448	99	14	12,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	10:09:24	0
176448	99	14	12,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	09:36:09	0
176448	99	14	12,1	cyclictest	606	50	irq/133-enp0s29f1:rx-0	08:42:07	0
176448	99	14	11,2	cyclictest	606	50	irq/133-enp0s29f1:rx-0	08:15:22	0
176448	99	14	10,3	cyclictest	606	50	irq/133-enp0s29f1:rx-0	07:40:15	0
176448	99	14	10,3	cyclictest	475828	-21	nfs_client	11:55:21	0
176460	99	13	9,3	cyclictest	357956	-21	kworker/u8:2+flush-259:0	11:25:19	3
176460	99	13	10,2	cyclictest	316482	-21	kworker/u8:3+flush-259:0	09:45:20	3
176452	99	13	9,2	cyclictest	0	-21	swapper/2	12:10:19	2
176452	99	13	8,3	cyclictest	465558	-21	ntpq	11:45:21	2
176452	99	13	6,5	cyclictest	2698871	-21	systemd-journal	12:30:00	2
176452	99	13	10,2	cyclictest	430692	-21	cpuspeed_turbos	11:15:14	2
176451	99	13	9,3	cyclictest	160716	-21	kworker/u8:2+flush-259:0	07:26:43	1
176451	99	13	9,2	cyclictest	0	-21	swapper/1	09:35:00	1
176451	99	13	11,1	cyclictest	0	-21	swapper/1	09:10:00	1
176451	99	13	10,2	cyclictest	362886	-21	sh	10:10:01	1
176451	99	13	10,2	cyclictest	357956	-21	kworker/u8:2+flush-259:0	11:10:26	1
176448	99	13	5,6	cyclictest	357310	-21	sed	10:00:28	0
176460	99	12	9,2	cyclictest	207886	-21	kworker/u8:3+events_unbound	08:40:24	3
176460	99	12	10,1	cyclictest	49	1	ktimers/3	10:55:23	3
176452	99	12	10,1	cyclictest	320600	-21	needreboot	09:25:20	2
176451	99	12	9,2	cyclictest	503287	-21	cpuspeed_turbos	12:25:15	1
176451	99	12	9,2	cyclictest	456611	-21	fschecks_time	11:40:17	1
176451	99	12	9,2	cyclictest	0	-21	swapper/1	12:15:00	1
176451	99	12	9,2	cyclictest	0	-21	swapper/1	11:50:19	1
176451	99	12	8,3	cyclictest	207886	-21	kworker/u8:3+flush-259:0	08:25:18	1
176451	99	12	7,4	cyclictest	315559	-21	ntpq	09:20:19	1
176451	99	12	10,1	cyclictest	0	-21	swapper/1	08:55:00	1
176451	99	12	0,4	cyclictest	321610	-21	munin-run	09:30:01	1
176460	99	11	8,2	cyclictest	373846	-21	journal-offline	10:20:01	3
176451	99	11	9,1	cyclictest	0	-21	swapper/1	10:50:28	1
176451	99	11	9,1	cyclictest	0	-21	swapper/1	07:50:16	1
176451	99	11	8,2	cyclictest	337567	-21	fschecks_time	09:45:14	1
176451	99	11	8,2	cyclictest	187115	-21	cpuspeed_turbos	07:20:18	1
176451	99	10	8,1	cyclictest	0	-21	swapper/1	10:10:13	1
176451	99	10	8,1	cyclictest	0	-21	swapper/1	08:20:17	1
176451	99	10	7,2	cyclictest	486051	-21	needreboot	12:05:21	1
176451	99	10	7,2	cyclictest	203196	-21	fschecks_count	07:35:16	1
176451	99	10	7,2	cyclictest	0	-21	swapper/1	07:50:00	1
176451	99	10	4,4	cyclictest	2698871	-21	systemd-journal	12:05:01	1
176451	99	10	4,4	cyclictest	2698871	-21	systemd-journal	11:34:59	1
176451	99	10	0,5	cyclictest	518435	-21	munin-run	12:40:00	1
176451	99	10	0,1	cyclictest	414880	-21	idleruntime-cro	10:59:59	1
176451	99	9	6,2	cyclictest	181855	-21	/usr/sbin/munin	07:15:14	1
176451	99	9	5,3	cyclictest	2698871	-21	systemd-journal	08:09:55	1
176451	99	8	6,1	cyclictest	0	-21	swapper/1	07:14:03	1
176451	99	8	4,3	cyclictest	443560	-21	tr	11:25:19	1
176451	99	8	4,3	cyclictest	31	1	ktimers/1	12:30:12	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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