OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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
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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 100 highest latencies:

System rack0slot4s.osadl.org (updated Thu Sep 03, 2026 00:46:15)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
3941510	2	364	325,13	sleep11	0	-21	swapper/11	19:09:58	3
3941208	2	364	344,13	sleep2	0	-21	swapper/2	19:06:02	8
3938016	2	362	345,11	sleep14	0	-21	swapper/14	19:05:11	6
3941449	2	361	340,14	sleep15	0	-21	swapper/15	19:09:12	7
3941286	2	361	322,13	sleep3	0	-21	swapper/3	19:07:08	9
3941403	2	356	317,13	sleep12	0	-21	swapper/12	19:08:38	4
3941354	2	354	333,14	sleep8	0	-21	swapper/8	19:08:01	14
3941182	2	352	333,12	sleep0	0	-21	swapper/0	19:05:45	0
3941461	2	351	331,13	sleep9	0	-21	swapper/9	19:09:22	15
3941249	2	351	331,13	sleep7	0	-21	swapper/7	19:06:40	13
3941307	2	350	315,28	sleep5	0	-21	swapper/5	19:07:27	11
3941227	2	350	330,13	sleep4	0	-21	swapper/4	19:06:21	10
3941296	2	349	328,14	sleep13	0	-21	swapper/13	19:07:19	5
3941289	2	345	324,14	sleep6	0	-21	swapper/6	19:07:12	12
3941233	2	344	325,13	sleep10	0	-21	swapper/10	19:06:26	2
3941303	2	342	320,14	sleep1	0	-21	swapper/1	19:07:22	1
3941992	99	78	76,1	cyclictest	4170308	-21	kworker/u32:0+events_unbound	23:25:16	12
3941992	99	78	76,1	cyclictest	4170308	-21	kworker/u32:0+events_unbound	23:25:16	12
3942004	99	62	59,2	cyclictest	78020	-21	kworker/u32:1+flush-259:0	00:20:18	2
3942013	99	60	58,2	cyclictest	4038668	-21	kworker/u32:0+events_unbound	21:47:59	5
3941969	99	55	53,2	cyclictest	4021857	-21	kworker/u32:3+events_unbound	21:17:16	0
3941992	99	53	52,0	cyclictest	0	-21	swapper/6	23:40:11	12
3942013	99	50	49,1	cyclictest	4067203	-21	kworker/u32:4+events_unbound	22:11:00	5
3941969	99	48	45,2	cyclictest	4170308	-21	kworker/u32:0+events_unbound	23:50:52	0
3942013	99	46	44,2	cyclictest	4123815	-21	kworker/u32:2+events_unbound	22:28:57	5
3941983	99	45	45,0	cyclictest	0	-21	swapper/3	19:55:12	9
3941983	99	45	42,2	cyclictest	4005277	-21	kworker/u32:0+events_unbound	20:23:30	9
3941983	99	45	42,2	cyclictest	4005277	-21	kworker/u32:0+events_unbound	20:23:30	9
3941992	99	44	42,1	cyclictest	8575	-21	kworker/u32:3+events_unbound	23:35:30	12
3942013	99	43	41,2	cyclictest	4139345	-21	kworker/u32:1+events_unbound	23:02:13	5
3941989	99	40	37,2	cyclictest	4067203	-21	kworker/u32:4+flush-259:0	22:10:22	11
3942008	99	38	36,2	cyclictest	3967749	-21	kworker/u32:1+flush-259:0	21:15:21	3
3941999	99	38	37,1	cyclictest	92408	-21	kworker/u32:2+events_unbound	00:31:49	14
3941969	99	38	36,2	cyclictest	0	-21	swapper/0	00:35:14	0
3942013	99	37	36,1	cyclictest	4170308	-21	kworker/u32:0+flush-259:0	00:04:17	5
3942008	99	36	35,1	cyclictest	4170308	-21	kworker/u32:0+flush-259:0	23:41:16	3
3941981	99	36	34,2	cyclictest	92408	-21	kworker/u32:2+events_unbound	00:34:23	8
3942020	99	35	33,1	cyclictest	4170308	-21	kworker/u32:0+events_unbound	22:57:06	7
3941969	99	35	33,1	cyclictest	20402	-21	kworker/u32:1+events_unbound	23:45:12	0
3941969	99	35	32,2	cyclictest	0	-21	swapper/0	19:10:11	0
3942011	99	34	33,1	cyclictest	4123815	-21	kworker/u32:2+flush-259:0	22:28:18	4
3942011	99	34	32,2	cyclictest	92408	-21	kworker/u32:2+events_unbound	00:36:55	4
3941983	99	34	33,1	cyclictest	4139345	-21	kworker/u32:1+events_unbound	23:04:47	9
3941976	99	34	32,1	cyclictest	3984264	-21	kworker/u32:0+events_unbound	19:57:54	1
3942020	99	33	33,0	cyclictest	0	-21	swapper/15	19:55:13	7
3942018	99	33	9,11	cyclictest	0	-21	swapper/14	20:05:49	6
3942013	99	33	29,3	cyclictest	0	-21	swapper/13	19:15:12	5
3942008	99	33	25,7	cyclictest	51881	-21	ethtool	23:45:14	3
3941969	99	33	33,0	cyclictest	0	-21	swapper/0	23:37:02	0
3941969	99	33	33,0	cyclictest	0	-21	swapper/0	22:57:59	0
3941969	99	33	33,0	cyclictest	0	-21	swapper/0	00:06:07	0
3941969	99	33	32,0	cyclictest	0	-21	swapper/0	21:25:18	0
3941969	99	33	31,1	cyclictest	4066667	-21	kworker/u32:1+events_unbound	21:30:14	0
3941969	99	33	30,2	cyclictest	4170308	-21	kworker/u32:0+events_unbound	23:20:08	0
3941969	99	33	30,2	cyclictest	4170308	-21	kworker/u32:0+events_unbound	23:20:08	0
3942020	99	32	30,2	cyclictest	3902878	-21	kworker/u32:3+events_unbound	19:39:59	7
3942018	99	32	8,11	cyclictest	0	-21	swapper/14	00:18:26	6
3942018	99	32	7,14	cyclictest	0	-21	swapper/14	19:54:49	6
3942018	99	32	0,29	cyclictest	0	-21	swapper/14	21:30:14	6
3942013	99	32	32,0	cyclictest	0	-21	swapper/13	19:10:11	5
3942013	99	32	29,3	cyclictest	3967749	-21	kworker/u32:1+events_unbound	20:54:13	5
3942011	99	32	31,1	cyclictest	4123815	-21	kworker/u32:2+flush-259:0	22:50:04	4
3942011	99	32	30,2	cyclictest	4021857	-21	kworker/u32:3+flush-259:0	20:42:04	4
3942004	99	32	31,1	cyclictest	4066667	-21	kworker/u32:1+events_unbound	21:27:30	2
3942002	99	32	14,15	cyclictest	0	-21	swapper/9	19:55:13	15
3941989	99	32	31,1	cyclictest	3967749	-21	kworker/u32:1+flush-259:0	20:45:15	11
3941969	99	32	32,0	cyclictest	0	-21	swapper/0	22:03:41	0
3942018	99	31	7,13	cyclictest	0	-21	swapper/14	23:56:28	6
3942018	99	31	7,13	cyclictest	0	-21	swapper/14	23:01:32	6
3942018	99	31	0,30	cyclictest	0	-21	swapper/14	19:55:34	6
3942013	99	31	31,0	cyclictest	0	-21	swapper/13	22:46:26	5
3942013	99	31	30,1	cyclictest	0	-21	swapper/13	00:35:14	5
3942013	99	31	0,30	cyclictest	0	-21	swapper/13	22:35:08	5
3942011	99	31	30,1	cyclictest	4058453	-21	ethtool	21:20:17	4
3942008	99	31	0,1	cyclictest	0	-21	swapper/11	21:45:15	3
3942002	99	31	11,18	cyclictest	0	-21	swapper/9	20:50:11	15
3942002	99	31	0,30	cyclictest	0	-21	swapper/9	22:00:15	15
3942002	99	31	0,30	cyclictest	0	-21	swapper/9	00:37:33	15
3941992	99	31	29,2	cyclictest	4139345	-21	kworker/u32:1+events_unbound	22:31:29	12
3941992	99	31	0,30	cyclictest	0	-21	swapper/6	20:16:46	12
3941989	99	31	0,30	cyclictest	0	-21	swapper/5	21:55:16	11
3941987	99	31	30,1	cyclictest	1774	-21	snmpd	20:02:01	10
3941987	99	31	0,28	cyclictest	0	-21	swapper/4	21:35:16	10
3941983	99	31	30,1	cyclictest	1774	-21	snmpd	20:06:13	9
3941976	99	31	30,1	cyclictest	1774	-21	snmpd	21:20:32	1
3941976	99	31	0,1	cyclictest	0	-21	swapper/1	19:15:55	1
3941969	99	31	30,1	cyclictest	3970448	-21	kworker/0:0+events	19:51:42	0
3941969	99	31	29,2	cyclictest	3996744	-21	kworker/u32:2+events_unbound	20:28:37	0
3941969	99	31	29,2	cyclictest	3996744	-21	kworker/u32:2+events_unbound	20:28:37	0
3941969	99	31	24,3	cyclictest	0	-21	swapper/0	23:56:41	0
3942020	99	30	0,30	cyclictest	0	-21	swapper/15	22:35:32	7
3942020	99	30	0,30	cyclictest	0	-21	swapper/15	21:42:52	7
3942020	99	30	0,29	cyclictest	0	-21	swapper/15	23:15:12	7
3942020	99	30	0,1	cyclictest	0	-21	swapper/15	21:30:14	7
3942018	99	30	7,12	cyclictest	0	-21	swapper/14	23:12:32	6
3942018	99	30	6,13	cyclictest	0	-21	swapper/14	23:45:29	6
3942018	99	30	6,13	cyclictest	0	-21	swapper/14	21:00:43	6
3942018	99	30	29,1	cyclictest	1774	-21	snmpd	21:07:12	6
3942018	99	30	29,1	cyclictest	1774	-21	snmpd	19:32:11	6
3942018	99	30	27,2	cyclictest	3996744	-21	kworker/u32:2+events_unbound	20:36:18	6
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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