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2026-03-22 - 13:14

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 376 highest latencies:
System rack9slot8s.osadl.org (updated Sun Mar 22, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
820501600,0irq/47-4a100000867-21runrttasks19:05:150
382929119,0sleep01914-21kworker/u2:400:00:170
81950860,0irq/46-4a100000520-21latency_hist22:45:030
82050850,0irq/47-4a10000024605-21runrttasks23:35:400
82050850,0irq/47-4a10000021412-21sshd23:28:570
82050850,0irq/47-4a10000012086-21snmpd22:08:480
82050850,0irq/47-4a10000011559-21sshd00:16:570
82050840,0irq/47-4a10000028412-21sshd23:43:560
81950820,0irq/46-4a10000030187-21seq22:39:090
81950820,0irq/46-4a10000013675-21ssh00:21:200
82050810,0irq/47-4a1000009350-21apt20:00:010
82050810,0irq/47-4a10000018275-21rm00:30:570
82050810,0irq/47-4a10000012372-21latency_hist23:10:040
82050810,0irq/47-4a10000012086-21snmpd21:33:060
82050800,0irq/47-4a1000005377-21kworker/u2:421:48:500
82050800,0irq/47-4a10000012086-21snmpd21:18:000
81950800,0irq/46-4a10000026647-21ssh21:23:040
82050790,0irq/47-4a10000016445-21gpg-connect-age20:45:080
82050790,0irq/47-4a10000011627-21rs:main0
81950790,0irq/46-4a1000002287-21runrttasks22:48:440
81950790,0irq/46-4a10000017230-21ssh22:11:350
81950790,0irq/46-4a10000015660-21ssh00:25:160
81950790,0irq/46-4a10000010262-21apt-config23:05:160
79172797,0sleep07922-21ssh21:51:540
94750780,0irq/33-mmc016160-1kworker/0:2H20:37:510
82050780,0irq/47-4a100000576-21ssh23:53:490
82050780,0irq/47-4a100000479-21kworker/u2:321:55:180
82050780,0irq/47-4a100000436-21rm21:36:090
82050780,0irq/47-4a10000022075-21rm00:39:070
82050780,0irq/47-4a10000019905-21ssh22:17:190
82050780,0irq/47-4a1000001715-21sshd19:10:570
82050780,0irq/47-4a1000001227-21ssh23:55:050
81950780,0irq/46-4a1000002629-21ssh21:40:380
82050770,0irq/47-4a1000004168-21idleruntime-cro19:25:020
82050770,0irq/47-4a10000028268-21ssh21:26:250
82050770,0irq/47-4a10000026304-21ssh22:30:430
82050770,0irq/47-4a10000020362-21diskmemload22:54:130
82050770,0irq/47-4a10000019749-21rm21:05:120
82050770,0irq/47-4a10000016836-21ssh23:19:270
82050770,0irq/47-4a10000012086-21snmpd19:37:340
81950770,0irq/46-4a1000007543-21sh00:08:280
81950770,0irq/46-4a10000023500-21ssh23:33:250
63992770,0sleep01460-21kworker/u2:122:57:250
54232770,0sleep01401-21kworker/u2:319:33:230
189732770,0chrt5222-21kworker/u2:323:23:530
82050760,0irq/47-4a10000016261-21apt-get20:45:030
82050760,0irq/47-4a10000014405-21runrttasks20:32:160
81950760,0irq/46-4a1000002529-21latency19:15:100
81950760,0irq/46-4a10000022030-21ssh21:13:280
174852760,0sleep017443-21kworker/u2:220:51:340
101760,0ktimersoftd/029854-21ssh23:46:550
94750750,0irq/33-mmc016160-1kworker/0:2H20:27:460
82050750,0irq/47-4a1000008481-21diskmemload23:01:460
82050750,0irq/47-4a1000005916-1kworker/u3:119:45:040
82050750,0irq/47-4a10000013023-21sshd20:22:560
82050750,0irq/47-4a10000012086-21snmpd22:28:240
82050750,0irq/47-4a10000011623-21sshd20:13:570
82050750,0irq/47-4a10000010257-21diskmemload00:14:160
81950750,0irq/46-4a1000006655-21seq19:41:160
81950750,0irq/46-4a10000012172-21ssh22:00:420
82050740,0irq/47-4a10000012107-21runrttasks20:16:490
44932740,0sleep04416-21kworker/u2:019:26:500
193642740,0sleep017443-21kworker/u2:221:04:390
82050730,0irq/47-4a1000009402-21apt-key20:00:080
107592730,0chrt10542-21kworker/u2:520:07:550
84922710,0sleep05164-21kworker/u2:119:54:130
82050700,0irq/47-4a10000018675-21munin-run21:00:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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