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 Wed May 27, 2026 12:44:16)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
4080877	2	355	0,2	sleep3	48	1	ktimers/3	08:45:42	3
3984400	99	62	51,8	cyclictest	4183883	-21	ntpq	10:25:53	1
3984398	99	58	49,6	cyclictest	4081045	-21	diskstats	08:45:43	0
3984400	99	57	47,8	cyclictest	20569	-21	apt-get	11:00:01	1
3984400	99	56	49,5	cyclictest	2615400	-21	kworker/u8:1+flush-8:0	08:10:58	1
83879	2	54	0,2	sleep0	16	1	rcu_preempt	12:00:50	0
83879	2	54	0,2	sleep0	16	1	rcu_preempt	12:00:49	0
3984398	99	54	49,3	cyclictest	3147316	-21	kworker/u8:2+events_unbound	09:00:57	0
102680	2	52	0,2	sleep0	3984392	-21	cyclictest	12:20:48	0
3984400	99	51	45,4	cyclictest	15842	-21	kworker/u8:3+flush-8:0	11:30:51	1
3984398	99	51	46,4	cyclictest	3147316	-21	kworker/u8:2+events_unbound	07:10:49	0
3984398	99	51	1,47	cyclictest	1	-21	systemd	09:20:00	0
3984398	99	50	42,6	cyclictest	20572	-21	latency_hist	11:00:01	0
3984400	99	49	34,12	cyclictest	1704890	-21	systemd-journal	09:10:01	1
3984400	99	48	36,9	cyclictest	4014936	-21	ntpq	07:35:53	1
3984398	99	48	42,4	cyclictest	4015846	-21	kworker/u8:3+events_unbound	08:55:48	0
3984400	99	46	39,5	cyclictest	4015846	-21	kworker/u8:3+flush-8:0	08:01:00	1
3984400	99	46	37,6	cyclictest	4054585	-21	ntpq	08:15:52	1
3984398	99	46	41,4	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	07:16:03	0
3984398	99	46	41,3	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	10:10:52	0
3984400	99	45	38,5	cyclictest	90541	-21	apt-get	12:10:40	1
3984400	99	45	33,8	cyclictest	1704890	-21	systemd-journal	07:11:50	1
3984398	99	45	38,4	cyclictest	1	-21	systemd	08:15:00	0
3984400	99	44	39,3	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	07:15:44	1
3984400	99	44	37,5	cyclictest	21126	-21	apt-get	11:00:40	1
3984398	99	44	32,9	cyclictest	1704890	-21	systemd-journal	09:34:59	0
3984400	99	43	37,4	cyclictest	1704890	-21	systemd-journal	09:40:50	1
3984400	99	43	36,5	cyclictest	4015846	-21	kworker/u8:3+events_unbound	08:50:53	1
3984400	99	43	34,7	cyclictest	110286	-21	latency_hist	12:30:01	1
3984398	99	43	32,6	cyclictest	4105211	-21	true	09:10:01	0
3984398	99	43	31,10	cyclictest	4059527	-21	ntpq	08:20:52	0
3984398	99	42	37,3	cyclictest	4104885	-21	kworker/u8:1+events_unbound	09:20:43	0
3984398	99	42	36,4	cyclictest	4040687	-21	latency_hist	08:05:00	0
3984398	99	42	33,7	cyclictest	4128916	-21	kworker/u8:3+events_unbound	09:56:01	0
3984398	99	42	33,6	cyclictest	4015861	-21	latency_hist	07:40:01	0
3984400	99	41	34,5	cyclictest	94852	-21	kworker/u8:2+flush-8:0	12:30:49	1
3984398	99	41	36,3	cyclictest	4104885	-21	kworker/u8:1+events_unbound	09:45:52	0
3984403	99	40	34,4	cyclictest	3979356	-21	kworker/u8:0+flush-8:0	07:30:58	2
3984400	99	40	34,5	cyclictest	4115343	-21	kworker/u8:0+flush-8:0	10:35:56	1
3984400	99	40	33,5	cyclictest	4026137	-21	apt-get	07:50:40	1
3984398	99	40	35,3	cyclictest	4115343	-21	kworker/u8:0+flush-8:0	11:05:44	0
3984400	99	39	33,4	cyclictest	80024	-21	kworker/u8:1+events_unbound	12:35:52	1
3984398	99	39	33,4	cyclictest	2615400	-21	kworker/u8:1+flush-8:0	07:50:44	0
3984398	99	39	28,9	cyclictest	80024	-21	kworker/u8:1+flush-8:0	12:36:03	0
3984403	99	38	28,8	cyclictest	95935	-21	diskstats	12:15:43	2
3984400	99	38	32,4	cyclictest	54811	-21	kworker/u8:2+events_unbound	11:50:50	1
3984400	99	38	29,7	cyclictest	4115343	-21	kworker/u8:0+flush-8:0	11:40:56	1
3984400	99	38	29,6	cyclictest	4095301	-21	latency_hist	09:00:01	1
3984398	99	38	32,4	cyclictest	2615400	-21	kworker/u8:1+flush-8:0	07:40:44	0
3984076	2	38	4,31	sleep2	0	-21	swapper/2	07:08:11	2
3984400	99	37	32,4	cyclictest	4015846	-21	kworker/u8:3+events_unbound	08:39:59	1
3984400	99	37	30,5	cyclictest	4115343	-21	kworker/u8:0+flush-8:0	12:05:56	1
3984400	99	37	24,10	cyclictest	29811	-21	ntpq	11:05:51	1
3984398	99	37	32,4	cyclictest	54811	-21	kworker/u8:2+events_unbound	11:55:53	0
3984400	99	36	32,3	cyclictest	4179667	-21	awk	10:25:00	1
3984400	99	36	32,3	cyclictest	4179667	-21	awk	10:24:59	1
3984400	99	36	30,4	cyclictest	2615400	-21	kworker/u8:1+flush-8:0	08:05:46	1
3984398	99	36	29,5	cyclictest	4115343	-21	kworker/u8:0+events_unbound	11:10:51	0
3984115	2	36	3,9	sleep1	0	-21	swapper/1	07:08:42	1
3984403	99	35	29,4	cyclictest	54811	-21	kworker/u8:2+flush-8:0	11:50:47	2
3984400	99	35	30,4	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	07:21:00	1
3984400	99	35	28,5	cyclictest	15842	-21	kworker/u8:3+flush-8:0	12:20:53	1
3984400	99	35	28,5	cyclictest	15842	-21	kworker/u8:3+flush-8:0	11:25:45	1
3984400	99	35	27,5	cyclictest	1704890	-21	systemd-journal	09:25:51	1
3984400	99	35	27,5	cyclictest	1704890	-21	systemd-journal	08:25:51	1
3984398	99	35	31,3	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	10:30:58	0
3984403	99	34	28,4	cyclictest	95154	-21	apt-get	12:15:01	2
3984400	99	34	30,3	cyclictest	15842	-21	kworker/u8:3+flush-8:0	11:55:58	1
3984400	99	34	29,3	cyclictest	4115343	-21	kworker/u8:0+events_unbound	10:40:47	1
3984400	99	34	25,6	cyclictest	1704890	-21	systemd-journal	09:56:51	1
3984398	99	34	30,3	cyclictest	15842	-21	kworker/u8:3+events_unbound	12:15:52	0
3984398	99	34	30,3	cyclictest	110284	-21	apt-get	12:30:01	0
3984398	99	34	27,5	cyclictest	15608	-21	latency_hist	10:55:01	0
3984400	99	33	29,3	cyclictest	4104885	-21	kworker/u8:1+events_unbound	09:15:53	1
3984400	99	33	27,4	cyclictest	4105489	-21	apt-get	09:10:39	1
3984400	99	33	26,5	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	09:45:53	1
3984400	99	33	26,5	cyclictest	15842	-21	kworker/u8:3+flush-8:0	11:35:54	1
3984398	99	33	28,3	cyclictest	60620	-21	cron	11:40:00	0
3984398	99	33	27,4	cyclictest	15842	-21	kworker/u8:3+events_unbound	11:30:44	0
3984398	99	33	24,7	cyclictest	4055495	-21	latency_hist	08:20:00	0
3984400	99	32	28,2	cyclictest	4170724	-21	irqrtprio	10:15:45	1
3984400	99	32	28,2	cyclictest	4170724	-21	irqrtprio	10:15:45	1
3984400	99	32	27,4	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	10:50:58	1
3984400	99	32	25,5	cyclictest	4165070	-21	apt-get	10:10:39	1
3984398	99	32	28,3	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	07:46:22	0
3984398	99	32	28,3	cyclictest	2615400	-21	kworker/u8:1+events_unbound	07:55:57	0
3984398	99	32	27,3	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	08:25:49	0
3984398	99	32	20,9	cyclictest	1704890	-21	systemd-journal	09:45:00	0
3984403	99	31	25,4	cyclictest	20611	-21	gpgv	11:00:01	2
3984403	99	31	20,8	cyclictest	110694	-21	cat	12:30:02	2
3984400	99	31	26,4	cyclictest	4015846	-21	kworker/u8:3+events_unbound	08:30:45	1
3984400	99	31	26,4	cyclictest	3147316	-21	kworker/u8:2+flush-8:0	07:49:21	1
3984400	99	31	26,3	cyclictest	70510	-21	awk	11:50:00	1
3984400	99	31	26,3	cyclictest	401	-21	dbus-daemon	09:05:01	1
3984400	99	31	25,4	cyclictest	4035757	-21	sendmail	08:00:00	1
3984398	99	31	26,4	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	09:35:53	0
3984403	99	30	23,5	cyclictest	4104885	-21	kworker/u8:1+flush-8:0	09:25:56	2
3984403	99	30	20,8	cyclictest	769	-21	awk	10:40:01	2
3984400	99	30	26,2	cyclictest	4085431	-21	turbostat.cron	08:49:59	1
3984400	99	30	24,5	cyclictest	80024	-21	kworker/u8:1+flush-8:0	12:00:53	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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