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2025-12-08 - 23:40

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 100 highest latencies:
System rack9slot8s.osadl.org (updated Mon Dec 08, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501740,0irq/47-4a10000025702-21seq07:06:010
81850870,0irq/46-4a10000026286-21runrttasks10:47:540
81850820,0irq/46-4a10000017871-21ssh11:39:180
81850810,0irq/46-4a1000007026-21date12:25:050
81850810,0irq/46-4a1000002252-21ssh09:56:240
81850810,0irq/46-4a10000017862-21seq09:20:490
81850800,0irq/46-4a10000022319-21ssh11:48:450
81850790,0irq/46-4a10000024453-21apt-get09:35:330
81850780,0irq/46-4a1000005739-21ssh12:22:250
81850780,0irq/46-4a10000031894-21munin-run10:59:590
81850780,0irq/46-4a10000029312-21apt-key09:45:020
81850780,0irq/46-4a10000024523-21ssh11:53:260
81850780,0irq/46-4a10000011389-21ssh12:34:360
81850770,0irq/46-4a1000009399-21ssh11:21:080
81850770,0irq/46-4a100000442-21ssh09:52:370
81850770,0irq/46-4a10000027201-21ssh11:59:100
81850770,0irq/46-4a1000002596-21ssh11:06:350
81850770,0irq/46-4a10000020461-21ssh09:26:210
81850770,0irq/46-4a10000015409-21ssh09:15:420
91542760,0sleep04464-21kworker/u2:610:11:100
81850760,0irq/46-4a10000027884-21ssh12:00:240
81850760,0irq/46-4a10000023009-21ssh09:31:450
81850750,0irq/46-4a1000004294-21ssh11:10:100
81850750,0irq/46-4a10000027631-21ssh09:41:250
81850750,0irq/46-4a10000014213-21ssh11:31:220
81850750,0irq/46-4a10000013380-21seq09:11:290
190942750,0sleep016420-21kworker/u2:010:32:280
81950740,0irq/47-4a10000013519-21dpkg11:30:040
81850740,0irq/46-4a1000005070-21ssh10:02:270
81850740,0irq/46-4a1000004176-21seq08:15:230
81850740,0irq/46-4a10000032292-21ssh11:00:380
159702740,0chrt14030-21kworker/u2:710:25:400
81850730,0irq/46-4a10000011395-21runrttasks09:01:310
81850730,0irq/46-4a10000011044-21ssh10:15:100
81950720,0irq/47-4a10000022588-21ssh10:40:010
81850720,0irq/46-4a1000004464-21kworker/u2:610:09:570
81850720,0irq/46-4a1000002379-21ssh12:15:130
243212727,0sleep024330-21ssh10:43:450
22612720,0chrt30851-21kworker/u2:408:02:390
81850710,0irq/46-4a1000006926-21ssh11:15:530
81850710,0irq/46-4a10000032055-21latency_hist07:44:530
81850710,0irq/46-4a10000012569-21diskmemload10:20:040
303002710,0chrt29156-21kworker/u2:007:34:470
17532710,0chrt30851-21kworker/u2:407:59:470
130482710,0chrt23777-21kworker/u2:312:38:030
107912710,0sleep08945-21kworker/u2:108:59:220
96592700,0chrt8201-21kworker/u2:508:51:080
81850700,0irq/46-4a10000026171-21kworker/u2:112:10:030
75902700,0sleep07557-21kworker/u2:408:37:220
295652700,0sleep024297-21kworker/u2:207:29:450
29372700,0sleep02085-21kworker/u2:108:07:110
81850690,0irq/46-4a1000002172-21cron12:15:000
80942690,0chrt6244-21kworker/u2:308:40:190
34712690,0sleep02085-21kworker/u2:108:10:370
264362690,0sleep024691-21kworker/u2:407:10:510
120662690,0sleep06244-21kworker/u2:309:06:010
88782680,0chrt6244-21kworker/u2:308:45:460
286422680,0sleep024297-21kworker/u2:207:23:110
279142680,0sleep027758-21kworker/u2:607:18:260
281142670,0chrt25518-21kworker/u2:110:51:450
81850660,0irq/46-4a1000006856-21chrt08:33:590
81850640,0irq/46-4a10000029905-1kworker/u3:407:35:030
81950630,0irq/47-4a10000031626-1kworker/u3:207:46:540
81850630,0irq/46-4a1000000-21swapper11:42:420
81850610,0irq/46-4a1000000-21swapper07:52:290
26221995032,0cyclictest6113-21runrttasks08:28:530
26221994730,0cyclictest4907-21runrttasks08:20:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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