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2025-11-15 - 01:33

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 Nov 14, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819508860,0irq/47-4a10000011417-1kworker/u3:207:05:110
2180328310,0sleep021769-21/usr/sbin/munin09:59:590
81950780,0irq/47-4a1000004170-21kworker/u2:110:54:370
81950760,0irq/47-4a1000006918-21ssh09:28:050
101750,0ktimersoftd/02090-21ssh09:18:030
101740,0ktimersoftd/031598-21ssh09:11:490
81950730,0irq/47-4a10000031069-21ssh10:19:540
81950730,0irq/47-4a10000011346-21kworker/u2:210:48:090
81950720,0irq/47-4a10000026829-21ssh10:10:360
81950720,0irq/47-4a10000020459-21kworker/u2:011:09:330
81850720,0irq/46-4a10000018526-21ssh11:02:170
81950710,0irq/47-4a10000027175-1kworker/u3:508:56:170
81950710,0irq/47-4a10000018805-21kworker/u2:312:31:080
101710,0ktimersoftd/018620-21ssh09:53:080
81950700,0irq/47-4a10000031523-21kworker/u2:009:20:270
81850700,0irq/46-4a10000031523-21kworker/u2:009:42:300
101700,0ktimersoftd/09765-21ssh11:52:470
101700,0ktimersoftd/04052-21sh11:40:290
101700,0ktimersoftd/024634-21ssh12:24:290
101700,0ktimersoftd/021337-21ssh12:17:240
101700,0ktimersoftd/018837-21ssh12:12:020
101700,0ktimersoftd/016526-21ssh12:07:070
81950690,0irq/47-4a10000022847-21kworker/u2:111:18:550
81950690,0irq/47-4a10000018805-21kworker/u2:312:39:030
81850690,0irq/46-4a10000030628-21diskmemload10:23:480
81850690,0irq/46-4a100000101ktimersoftd/010:00:250
101690,0ktimersoftd/026596-21ssh12:28:380
101690,0ktimersoftd/012981-21munin-node07:14:520
101690,0ktimersoftd/011563-21ssh11:56:350
81950680,0irq/47-4a10000031842-21kworker/u2:710:40:470
81950680,0irq/47-4a10000029423-21kworker/u2:210:30:330
81950680,0irq/47-4a1000001795-21ssh11:35:440
81950680,0irq/47-4a10000015180-21lldpd08:48:070
81850680,0irq/46-4a10000018164-21kworker/u2:408:20:190
101680,0ktimersoftd/028463-21ssh11:23:370
101680,0ktimersoftd/019419-21latency_hist07:54:550
101680,0ktimersoftd/019141-21chrt07:53:370
101680,0ktimersoftd/014251-21seq07:19:550
81950670,0irq/47-4a1000008232-21ssh09:30:490
81950670,0irq/47-4a1000007790-21ssh10:39:280
81950670,0irq/47-4a10000024754-21ssh10:06:100
81950670,0irq/47-4a10000013730-21kworker/u2:207:17:570
81850670,0irq/46-4a1000006787-1kworker/u3:411:47:210
81850670,0irq/46-4a1000000-21swapper09:45:330
101670,0ktimersoftd/032279-21ssh11:31:360
101670,0ktimersoftd/030160-21diskmemload11:27:110
101670,0ktimersoftd/028387-21modprobe08:54:530
101670,0ktimersoftd/020705-21seq08:04:130
101670,0ktimersoftd/016436-21ssh10:57:520
101670,0ktimersoftd/014906-21rm12:03:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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