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2026-08-22 - 02:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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 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 rackeslot8s.osadl.org (updated Fri Aug 21, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
276604121220,3sleep1331rcuc/111:35:191
28420542460,1sleep0151ktimers/012:25:160
25743882340,2sleep014-21ksoftirqd/009:35:010
2379196992825,1cyclictest0-21swapper/309:25:003
2379196992618,6cyclictest2419811-21sleep07:40:013
27755262250,2sleep10-21swapper/111:41:281
27954032221,19sleep12797216-21cut11:55:211
2379196992118,1cyclictest0-21swapper/307:30:133
2379196992017,1cyclictest0-21swapper/312:17:113
2379196992017,1cyclictest0-21swapper/308:30:153
237919699192,14cyclictest2683375-21turbostat10:45:003
237919699191,13cyclictest2452125-21chrt08:05:123
28225542180,7sleep22822560-21ssh12:12:312
27122342180,5sleep22712285-21awk11:00:182
237919699187,7cyclictest25589532sleep309:25:143
237919699186,8cyclictest2761181-21turbostat11:35:003
237919699186,8cyclictest2394185-21turbostat07:20:013
237919699182,12cyclictest0-21swapper/309:10:203
2379196991815,1cyclictest0-21swapper/311:19:593
2379196991815,1cyclictest0-21swapper/310:00:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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