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2026-04-18 - 17:03

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 Apr 18, 2026 12:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3052227776,0sleep00-21swapper/006:53:160
429124737,0sleep30-21swapper/306:55:123
452923531,0sleep20-21swapper/206:57:592
436923526,0sleep10-21swapper/106:56:061
46169970,0cyclictest0-21swapper/210:58:232
339970,0migration/324802-21switchtime07:33:303
46169966,0cyclictest0-21swapper/208:28:272
46169964,0cyclictest23896-21python11:28:282
46169962,0cyclictest9851-21munin-node11:43:242
46149960,0cyclictest16908-40yum-updatesd-he10:43:561
46149960,0cyclictest0-21swapper/110:58:261
46139963,0cyclictest12204-21munin-run07:28:070
339960,0migration/39734-21sh11:02:073
339960,0migration/39217-21munin-node08:58:333
339960,0migration/325821-21sh09:49:093
339960,0migration/325117-21sh12:12:023
339960,0migration/317900-21munin-node11:48:163
339960,0migration/316664-21needreboot10:03:253
29725060,0irq/27-eth0-tx-12435-21munin-node07:28:240
29715060,0irq/26-eth0-rx-9380-21ssh11:42:343
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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