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2025-11-29 - 18:00

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 Sat Nov 29, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819509730,0irq/47-4a10000019534-1kworker/u3:307:05:110
81850870,0irq/46-4a10000011905-21sh09:20:080
81850860,0irq/46-4a10000031996-21runrttasks12:20:320
81950850,0irq/47-4a1000003752-21diskmemload12:29:360
81950850,0irq/47-4a10000021465-21ssh10:49:340
81950840,0irq/47-4a10000023065-21ssh12:01:430
81950830,0irq/47-4a1000005242-21sendmail08:59:550
81950830,0irq/47-4a10000028721-21munin-run11:04:590
81950830,0irq/47-4a10000022906-21sendmail-msp07:19:520
81850830,0irq/46-4a1000004159-21ssh10:12:400
81850830,0irq/46-4a10000024791-21ssh09:47:330
81950820,0irq/47-4a10000031802-21ssh10:02:230
81950820,0irq/47-4a10000026591-21/usr/sbin/munin07:44:520
81950820,0irq/47-4a10000013046-21rm10:31:290
81850820,0irq/46-4a10000029877-21ssh09:58:310
81950810,0irq/47-4a1000009548-21sshd09:15:130
81950810,0irq/47-4a100000717-21rm10:05:140
81950810,0irq/47-4a10000028787-21apt07:59:510
81950810,0irq/47-4a10000027577-21kworker/u2:112:15:020
81950810,0irq/47-4a10000017263-21ssh11:49:400
81850810,0irq/46-4a10000018183-21ssh11:51:290
231832818,0sleep023189-21ssh10:53:100
230352810,0chrt22401-21kworker/u2:307:20:060
102502818,0sleep010255-21ssh10:25:300
81950800,0irq/47-4a1000009018-21ssh09:14:170
81950800,0irq/47-4a1000007296-21rm12:37:000
81950800,0irq/47-4a1000006428-21ssh11:26:260
81950800,0irq/47-4a1000004202-21ssh12:30:220
81950800,0irq/47-4a10000016405-21ssh10:38:440
81950800,0irq/47-4a10000010357-21cron11:34:590
81850800,0irq/46-4a10000030415-21ssh12:17:200
81850800,0irq/46-4a10000022972-21ssh09:43:420
81850800,0irq/46-4a10000016027-21ssh09:28:510
257922800,0chrt25428-21kworker/u2:407:39:440
81950790,0irq/47-4a1000009920-21apt10:24:570
81950790,0irq/47-4a10000031508-21seq08:18:020
81850790,0irq/46-4a1000007443-21ssh10:19:450
81850790,0irq/46-4a10000025040-21ssh12:05:520
81850790,0irq/46-4a10000013334-21ssh11:41:070
81850790,0irq/46-4a10000011555-21ssh11:37:260
16512790,0chrt31997-21kworker/u2:211:16:190
81950780,0irq/47-4a1000004075-21kworker/u2:209:05:220
81950780,0irq/47-4a10000031914-21ssh11:11:410
81950780,0irq/47-4a10000030748-21ssh11:09:180
81950780,0irq/47-4a10000027667-21ssh09:53:470
81950780,0irq/47-4a10000024665-21ssh10:56:150
81950780,0irq/47-4a10000020177-21ssh11:55:410
81950780,0irq/47-4a10000019089-21ssh09:35:150
81950780,0irq/47-4a10000017468-21ssh09:31:510
81950780,0irq/47-4a1000001730-21sshd08:35:360
81850780,0irq/46-4a10000017166-21ssh10:40:100
81950770,0irq/47-4a10000031757-21latency_hist08:19:550
81950770,0irq/47-4a10000021468-21sshd07:13:050
50772776,0sleep05083-21ssh11:23:400
81950750,0irq/47-4a1000006027-21gpgv09:04:570
81950750,0irq/47-4a1000001537-21munin-run08:34:530
294582750,0chrt26825-21kworker/u2:608:04:190
267462750,0chrt26203-21kworker/u2:507:45:180
81950740,0irq/47-4a10000024367-21/usr/sbin/munin07:29:510
5202740,0sleep027573-21kworker/u2:008:27:490
33932740,0chrt3328-21kworker/u2:008:46:550
81950730,0irq/47-4a10000022401-21kworker/u2:307:51:040
44632730,0sleep02262-21kworker/u2:408:54:430
101730,0ktimersoftd/02754-21runrttasks08:42:410
101690,0ktimersoftd/029992-21seq08:07:400
101680,0ktimersoftd/030693-21seq08:12:250
101530,0ktimersoftd/00-21swapper07:30:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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