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2025-11-13 - 19:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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.
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 rackbslot8s (updated Thu Nov 13, 2025 12:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
292641999307306,1cyclictest3044824-21lspci10:09:574
292640599301300,1cyclictest3044963-21lspci10:09:591
292642199251251,0cyclictest0-21swapper/510:09:585
292640199223223,0cyclictest0-21swapper/010:09:580
292642199162162,0cyclictest0-21swapper/507:29:325
29260302138117,16sleep30-21swapper/307:08:133
29261122134119,10sleep10-21swapper/107:09:241
29258652132117,10sleep40-21swapper/407:05:494
29261132127112,10sleep20-21swapper/207:09:252
29260902126111,10sleep60-21swapper/607:09:046
29260542125110,10sleep00-21swapper/007:08:350
29259222120104,10sleep70-21swapper/707:06:417
29240352119105,9sleep50-21swapper/507:05:025
29264199910498,2cyclictest546-21snmpd09:56:494
29264199910299,3cyclictest546-21snmpd09:48:444
29264199910299,3cyclictest546-21snmpd09:48:434
29264199910299,3cyclictest546-21snmpd08:42:584
29264199910298,4cyclictest546-21snmpd07:44:544
2926419991020,102cyclictest0-21swapper/410:18:064
29264149910299,3cyclictest546-21snmpd09:51:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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