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2026-05-22 - 14:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 rack7slot7s.osadl.org (updated Fri May 22, 2026 00:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1796929783,9sleep00-21swapper/019:09:140
1785728875,9sleep20-21swapper/219:07:482
1787128568,13sleep10-21swapper/119:07:591
1773328370,9sleep30-21swapper/319:06:123
80562640,1sleep30-21swapper/300:01:323
1811599270,27cyclictest0-21swapper/222:24:172
1811599260,25cyclictest0-21swapper/200:00:122
18108992623,2cyclictest13-21ksoftirqd/023:05:180
1810899260,1cyclictest0-21swapper/021:32:070
18115992523,2cyclictest0-21swapper/222:57:032
18115992521,3cyclictest0-21swapper/200:25:232
1811599250,24cyclictest0-21swapper/223:25:082
18118992421,2cyclictest1071-21kworker/3:223:41:233
18118992420,3cyclictest16259-21kworker/3:100:11:533
18115992418,5cyclictest0-21swapper/200:10:032
1811599240,23cyclictest0-21swapper/223:15:382
1811299241,21cyclictest20712-21open_inodes20:20:201
1811299240,2cyclictest0-21swapper/122:59:361
1811899230,22cyclictest1071-21kworker/3:223:16:133
1811599230,21cyclictest0-21swapper/222:11:482
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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