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2025-10-17 - 15:38

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 50 highest latencies:
System rack9slot8s.osadl.org (updated Fri Oct 17, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818501910,0irq/46-4a100000993-21kworker/0:007:08:110
1784229331,0sleep0101ktimersoftd/008:39:540
81850920,0irq/46-4a1000008526-21ssh09:49:330
81950860,0irq/47-4a10000021708-21dpkg12:35:080
81950860,0irq/47-4a10000010050-21awk07:49:520
81950850,0irq/47-4a10000022385-21ssh10:18:590
81950850,0irq/47-4a10000020822-21munin-run08:59:550
81950850,0irq/47-4a10000012710-21rm11:07:300
81950850,0irq/47-4a10000010966-21apt-key07:55:010
81950850,0irq/47-4a10000010781-21apt-get07:54:540
81850850,0irq/46-4a10000014501-21sendmail12:20:030
81850850,0irq/46-4a10000013800-21ssh10:00:330
81850850,0irq/46-4a10000010116-21ssh11:01:550
81950840,0irq/47-4a10000029861-21awk10:34:560
81950840,0irq/47-4a10000024906-21rm10:24:200
81950840,0irq/47-4a10000018605-21apt08:44:530
81950840,0irq/47-4a10000013111-21ssh09:59:180
81850840,0irq/46-4a10000026463-21ssh10:27:350
81850840,0irq/46-4a1000001917-21ssh09:35:110
3182128410,0sleep031823-21ssh10:39:090
144302840,0chrt14285-21kworker/u2:008:17:590
81950830,0irq/47-4a1000009138-21munin-run11:00:000
81950830,0irq/47-4a1000004461-21munin-run10:49:580
81950830,0irq/47-4a10000032728-21apt11:50:000
81950830,0irq/47-4a10000019828-21ssh12:31:110
81950830,0irq/47-4a10000019231-21ssh12:30:030
81950830,0irq/47-4a10000012103-21munin-run12:15:020
81950830,0irq/47-4a10000010187-21rm09:52:570
81850830,0irq/46-4a10000027877-21ssh11:39:440
228062839,0sleep022807-21ssh09:10:330
81950820,0irq/47-4a1000006540-21ssh10:54:260
81950820,0irq/47-4a1000005563-21sshd07:20:050
81950820,0irq/47-4a10000030006-21ssh09:25:500
81950820,0irq/47-4a10000015370-21kworker/u2:412:24:090
81950820,0irq/47-4a10000012624-21sshd08:05:160
81850820,0irq/46-4a1000008555-21kworker/u2:312:08:050
81850820,0irq/46-4a1000006715-21ssh12:03:320
81850820,0irq/46-4a1000003584-21ssh11:56:470
81850820,0irq/46-4a10000027423-21ssh09:20:260
81850820,0irq/46-4a10000020375-21ssh10:14:450
81850820,0irq/46-4a10000018955-21ssh11:20:230
81850820,0irq/46-4a10000017928-21diskmemload10:09:320
81950810,0irq/47-4a1000007238-21kworker/u2:207:34:590
81950810,0irq/47-4a10000030158-21ssh11:44:330
81950810,0irq/47-4a10000025648-21awk11:34:590
81950810,0irq/47-4a1000002124-21munin-run10:44:580
81850810,0irq/46-4a100000611-21ssh11:50:340
81850810,0irq/46-4a10000018184-21chrt11:19:160
81950800,0irq/47-4a1000006436-21sshd07:26:130
81950800,0irq/47-4a1000006371-21cron09:44:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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