OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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.

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 the 376 highest latencies:

System rackfslot4s.osadl.org (updated Sat Apr 11, 2026 00:44:35)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
24102	2	126	0,3	chrt	24105	-21	latency_hist	23:20:05	0
10306	2	125	0,2	chrt	10309	-21	sleep	21:22:21	0
690	2	123	0,2	chrt	673	-21	ntpq	20:16:04	0
17116	2	122	0,2	sleep0	17115	-21	seq	23:09:37	0
30632	2	120	0,3	chrt	30627	-21	munin-run	23:30:01	0
12170	2	119	0,3	chrt	12167	-21	sshd	23:01:31	0
31565	2	118	0,3	sleep0	31566	-21	seq	22:41:59	0
25705	2	117	0,2	chrt	25701	-21	tune2fs	00:10:53	0
13123	2	117	0,2	chrt	13124	-21	ntp_kernel_pll_	21:26:29	0
19248	2	114	0,2	sleep0	19250	-21	latency_hist	19:55:06	0
25943	2	113	0,2	sleep0	25944	-21	seq	22:33:51	0
7243	2	112	0,3	chrt	7242	-21	sshd	22:06:31	0
6367	2	111	0,3	chrt	6368	-21	seq	19:34:05	0
7970	2	110	0,3	chrt	7971	-21	sleep	23:44:14	0
5052	2	110	0,1	sleep0	5056	-21	runrttasks	21:15:09	0
11700	2	110	0,2	chrt	11701	-21	chrt	22:12:41	0
29635	2	109	0,3	chrt	29636	-21	sleep	00:16:15	0
29532	2	109	0,3	chrt	29533	-21	sleep	22:39:30	0
23523	2	109	0,2	sleep0	23524	-21	irqrtprio	20:00:44	0
18189	2	108	0,2	chrt	18190	-21	seq	21:34:44	0
27981	2	106	0,2	chrt	27982	-21	modprobe	19:15:56	0
1683	2	105	0,3	chrt	1684	-21	sh	00:23:10	0
2875	2	100	0,2	sleep0	2877	-21	basename	00:25:34	0
7086	2	98	0,2	sleep0	7087	-21	seq	20:26:18	0
2223	2	96	0,2	sleep0	2224	-21	chrt	21:59:04	0
5869	2	91	0,2	sleep0	5865	-21	open_inodes	22:52:11	0
9849	2	90	0,1	sleep0	9853	-21	sendmail	19:40:01	0
29249	2	90	0,2	sleep0	29248	-21	seq	21:50:58	0
25215	2	88	0,2	sleep0	25217	-21	uniq	20:55:34	0
6585	2	87	0,2	sleep0	6586	-21	chrt	00:30:51	0
10204	2	87	0,2	sleep0	10207	-21	cut	00:36:04	0
5520	2	83	0,3	sleep0	5521	-21	chrt	22:03:54	0
26008	2	78	0,3	sleep0	26009	-21	chrt	23:22:16	0
18641	2	78	0,2	sleep0	18642	-21	ssh	00:00:33	0
14937	2	78	0,1	sleep0	14938	-21	chrt	23:55:00	0
20401	2	77	0,2	sleep0	20402	-21	ssh	23:14:32	0
14019	2	77	0,2	sleep0	14020	-21	chrt	19:45:47	0
28330	2	71	0,2	sleep0	28331	-21	chrt	21:00:34	0
16010	2	71	0,2	sleep0	16011	-21	seq	20:40:43	0
19363	2	70	0,2	sleep0	19364	-21	chrt	20:45:47	0
25054	2	68	0,2	sleep0	25056	-21	sort	00:10:05	0
10033	2	67	0,1	sleep0	10034	-21	seq	22:58:39	0
16372	2	66	0,2	sleep0	16371	-21	http	22:20:06	0
22988	2	63	0,2	sleep0	22987	-21	seq	22:29:44	0
3514	2	62	0,2	sleep0	3517	-21	cut	20:20:44	0
26302	2	61	0,1	sleep0	26345	-21	latency	21:46:14	0
11398	2	58	0,2	sleep0	11402	-21	wc	19:41:23	0
2774	2	52	0,1	sleep0	2777	-21	cut	21:11:11	0
19766	2	52	0,2	sleep0	19767	-21	chrt	19:55:49	0
23665	90	51	19,23	cyclictest	0	-21	swapper	22:48:16	0
21847	2	50	13,21	sleep0	21846	-21	ntpq	19:05:56	0
23665	90	49	18,23	cyclictest	0	-21	swapper	21:43:51	0
23665	90	49	17,23	cyclictest	32117	-21	ntpq	23:31:30	0
23665	90	49	17,13	cyclictest	17234	-21	df	22:20:58	0
23665	90	48	16,22	cyclictest	20221	-21	runrttasks	21:37:14	0
23665	90	47	18,15	cyclictest	0	-21	swapper	23:58:10	0
23665	90	47	16,22	cyclictest	548	-21	sort	19:25:03	0
23665	90	47	16,21	cyclictest	0	-21	swapper	19:11:25	0
23665	90	47	15,23	cyclictest	2419	-21	df	23:36:02	0
29981	2	46	0,2	sleep0	29990	-21	runrttasks	20:10:59	0
23665	90	46	16,22	cyclictest	12270	-21	chrt	20:35:25	0
23665	90	46	14,13	cyclictest	436	-21	runrttasks	19:25:50	0
23665	90	45	17,18	cyclictest	22106	-21	aten2.4-expect	20:51:13	0
23665	90	44	21,14	cyclictest	8499	-21	apt-get	23:45:15	0
23665	90	44	20,15	cyclictest	8864	-21	apt-get	20:30:16	0
23665	90	44	19,15	cyclictest	25771	-21	apt-get	20:05:16	0
23665	90	44	18,14	cyclictest	31053	-21	apt-get	21:05:19	0
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2024-02-27 - 12:39