OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, 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, lowest P state: performance
Compare latency of primary with shadow system

Characteristics of the 50 highest latencies:

System rackaslot4s.osadl.org (updated Thu Sep 18, 2025 00:43:30)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2090376	99	78	66,9	cyclictest	2119250	-21	apt-get		3
2090370	99	74	51,20	cyclictest	519	-21	systemd-journal		1
2090370	99	74	51,20	cyclictest	519	-21	systemd-journal		1
2090373	99	70	63,5	cyclictest	2298056	-21	ntpq		2
2090367	99	62	53,7	cyclictest	2270654	-21	kworker/u16:2+flush-179:0		0
2090367	99	61	53,6	cyclictest	2125540	-21	kworker/u16:0+events_unbound		0
2090367	99	61	53,6	cyclictest	2125540	-21	kworker/u16:0+events_unbound		0
2090373	99	58	49,7	cyclictest	2125540	-21	kworker/u16:0+flush-179:32		2
2090367	99	58	50,6	cyclictest	2125540	-21	kworker/u16:0+flush-179:0		0
2090367	99	58	50,6	cyclictest	2125540	-21	kworker/u16:0+flush-179:0		0
2090376	99	56	47,7	cyclictest	2152791	-21	kworker/u16:3+flush-179:0		3
2090376	99	56	47,7	cyclictest	2152791	-21	kworker/u16:3+flush-179:0		3
2090376	99	53	44,7	cyclictest	2136788	-21	kworker/u16:1+flush-179:32		3
2090370	99	51	42,7	cyclictest	2180730	-21	kworker/u16:2+flush-179:0		1
2090367	99	51	41,8	cyclictest	519	-21	systemd-journal		0
2090376	99	50	42,6	cyclictest	2125540	-21	kworker/u16:0+events_unbound		3
2090376	99	50	42,6	cyclictest	2125540	-21	kworker/u16:0+events_unbound		3
2090376	99	50	42,6	cyclictest	2125540	-21	kworker/u16:0+events_unbound		3
2090373	99	50	40,7	cyclictest	2237430	-21	kworker/u16:4+flush-179:32		2
2090373	99	50	39,8	cyclictest	2129890	-21	latency_hist		2
2090367	99	50	42,6	cyclictest	2208978	-21	kworker/u16:0+flush-179:32		0
2090367	99	50	39,8	cyclictest	519	-21	systemd-journal		0
2090367	99	50	39,8	cyclictest	519	-21	systemd-journal		0
2090370	99	49	41,6	cyclictest	2214058	-21	kworker/u16:3+flush-179:0		1
2090367	99	49	38,8	cyclictest	2304818	-21	lockfile-create		0
2090376	99	48	40,6	cyclictest	2270654	-21	kworker/u16:2+events_unbound		3
2090376	99	48	40,6	cyclictest	2256293	-21	kworker/u16:1+events_unbound		3
2090376	99	47	38,7	cyclictest	2237430	-21	kworker/u16:4+events_unbound		3
2090376	99	47	38,7	cyclictest	2136788	-21	kworker/u16:1+flush-179:0		3
2090370	99	47	38,7	cyclictest	2102633	-21	kworker/u16:0+flush-179:0		1
2090370	99	47	36,8	cyclictest	2291036	-21	timerandwakeup		1
2090376	99	46	38,6	cyclictest	2208978	-21	kworker/u16:0+events_unbound		3
2090376	99	46	38,6	cyclictest	2191747	-21	kworker/u16:3+events_unbound		3
2090376	99	46	37,7	cyclictest	2270654	-21	kworker/u16:2+flush-179:0		3
2090373	99	46	37,6	cyclictest	2136788	-21	kworker/u16:1+flush-179:32		2
2090370	99	46	36,7	cyclictest	2261212	-21	kworker/u16:3+flush-179:0		1
2090376	99	44	35,7	cyclictest	2136788	-21	kworker/u16:1+events_unbound		3
2090373	99	44	36,6	cyclictest	2214058	-21	kworker/u16:3+events_unbound		2
2090370	99	44	36,6	cyclictest	2180730	-21	kworker/u16:2+events_unbound		1
2090370	99	44	36,6	cyclictest	2152791	-21	kworker/u16:3+events_unbound		1
2090370	99	44	36,6	cyclictest	2152791	-21	kworker/u16:3+events_unbound		1
2090370	99	44	36,6	cyclictest	2122699	-21	kworker/u16:2+flush-179:32		1
2090367	99	44	18,14	cyclictest	2174080	-21	kworker/u16:4-rpciod		0
2090376	99	43	35,6	cyclictest	2261212	-21	kworker/u16:3+events_unbound		3
2090376	99	43	35,6	cyclictest	2256293	-21	kworker/u16:1+events_unbound		3
2090376	99	43	33,7	cyclictest	519	-21	systemd-journal		3
2090373	99	43	34,7	cyclictest	2136788	-21	kworker/u16:1+events_unbound		2
2090373	99	43	34,6	cyclictest	2246535	-21	kworker/u16:0+events_unbound		2
2090370	99	43	33,7	cyclictest	2293298	-21	kworker/u16:4+flush-179:0		1
2090370	99	43	32,8	cyclictest	2127272	-21	gzip		1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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