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2025-11-15 - 15:41

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 here to display the system's profile data or here to proceed to next system.
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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 20 highest latencies:
System rack1slot2s.osadl.org (updated Sat Nov 15, 2025 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
886228281,0sleep00-21swapper/006:38:110
291350480,0irq/25-eth10-21swapper/306:36:083
883323526,0sleep10-21swapper/106:37:481
864322824,0sleep20-21swapper/206:35:372
28415070,0irq/27-eth0-tx-0-21swapper/209:34:332
249970,0watchdog/20-21swapper/209:02:302
90819960,0cyclictest0-21swapper/209:25:092
90809966,0cyclictest0-21swapper/111:26:271
90809966,0cyclictest0-21swapper/110:19:361
90809960,0cyclictest1636-21diskmemload10:08:441
90809960,0cyclictest0-21swapper/111:33:521
4160,0ktimersoftd/031286-21iostat_ios07:20:080
4160,0ktimersoftd/00-21swapper/011:24:270
35160,0ktimersoftd/30-21swapper/311:36:173
339960,0migration/332498-21sh11:46:433
339960,0migration/319473-21sh10:35:303
339960,0migration/317413-21sh09:13:113
339960,0migration/310048-21sendmail_mailst10:50:133
28415060,0irq/27-eth0-tx-23250-21ssh09:35:372
28415060,0irq/27-eth0-tx-0-21swapper/211:45:242
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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