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2025-11-16 - 13:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #8

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 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: 50 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 792 highest latencies:
System rack9slot8s.osadl.org (updated Sun Nov 16, 2025 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501460,0irq/47-4a10000015180-21lldpd19:08:030
178829912312,0cyclictest27600-21apt21:59:560
178829911848,0cyclictest81850irq/46-4a10000019:14:540
178829911332,0cyclictest7503-21munin-run23:35:000
178829911229,0cyclictest15865-21ssh21:34:590
178829911228,0cyclictest820-21sh23:20:310
178829911227,0cyclictest12547-21sh23:45:380
178829911131,0cyclictest12157-21cron23:44:590
178829911125,0cyclictest81950irq/47-4a10000021:29:240
178829911022,0cyclictest17003-21ssh23:55:100
178829910929,0cyclictest7103-21sh21:16:380
178829910929,0cyclictest21539-21sh21:47:020
178829910928,0cyclictest23040-21diskmemload00:08:100
178829910832,0cyclictest81850irq/46-4a10000022:54:570
178829910828,0cyclictest19376-21sh21:42:290
178829910827,0cyclictest1913-21sh22:14:120
178829910823,0cyclictest14613-21latency_hist23:50:030
178829910810,0cyclictest27389-21sshd20:10:380
178829910711,0cyclictest9423-21ssh22:29:590
178829910630,0cyclictest28527-21apt00:20:010
178829910627,0cyclictest31294-21sh00:25:450
178829910625,0cyclictest81950irq/47-4a10000023:19:510
178829910611,0cyclictest8233-21ssh23:36:260
178829910530,0cyclictest3936-21latency_hist21:09:580
178829910530,0cyclictest2923-21ssh22:16:100
178829910529,0cyclictest5091-21sh23:29:520
178829910529,0cyclictest24985-21diskmemload00:12:190
178829910527,0cyclictest18655-21diskmemload22:49:230
178829910434,0cyclictest81850irq/46-4a10000021:30:070
178829910427,0cyclictest20012-21sh00:01:370
178829910427,0cyclictest15562-21sh22:42:500
178829910424,0cyclictest31672-21seq22:08:290
178829910329,0cyclictest15184-21lldpd22:02:540
178829910328,0cyclictest2966-21diskmemload00:34:440
178829910327,0cyclictest25519-21diskmemload23:04:040
178829910237,0cyclictest101ktimersoftd/022:22:560
178829910227,0cyclictest81950irq/47-4a10000021:53:560
178829910225,0cyclictest1573-21runrttasks20:54:420
178829910225,0cyclictest12419-21sh22:36:110
178829910127,0cyclictest81950irq/47-4a10000023:07:110
178829910025,0cyclictest29599-21diskmemload23:12:460
17882999938,0cyclictest101ktimersoftd/022:32:000
17882999835,0cyclictest101ktimersoftd/000:24:180
17882999741,0cyclictest81850irq/46-4a10000020:40:110
17882999527,0cyclictest17880-21cyclictest20:49:440
17882999327,0cyclictest17880-21cyclictest19:25:250
17882999125,0cyclictest0-21swapper21:21:330
17882998428,0cyclictest17880-21cyclictest19:30:230
17882996230,0cyclictest0-21swapper00:38:100
81850590,0irq/46-4a1000000-21swapper19:15:040
17882995746,0cyclictest81850irq/46-4a10000022:59:330
81850560,0irq/46-4a1000000-21swapper20:21:390
17882995442,0cyclictest81850irq/46-4a10000020:19:540
101540,0ktimersoftd/00-21swapper20:35:460
101530,0ktimersoftd/00-21swapper20:56:490
17882995226,0cyclictest24433-21seq19:50:420
17882995134,0cyclictest0-21swapper21:04:370
101510,0ktimersoftd/00-21swapper19:57:080
101510,0ktimersoftd/00-21swapper19:44:570
17882995035,0cyclictest25997-21runrttasks20:01:170
17882994935,0cyclictest30752-21sshd20:33:510
17882994934,0cyclictest0-21swapper19:36:490
17882994926,0cyclictest30226-21latency_hist20:29:550
17882994832,0cyclictest27054-21runrttasks20:08:510
17882994732,0cyclictest3788-21runrttasks21:09:360
17882994731,0cyclictest23475-21cron19:44:520
17882994630,0cyclictest17880-21cyclictest19:20:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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