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2025-12-04 - 22:30

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 Dec 04, 2025 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34310882137128,5sleep20-21swapper/207:08:382
34309052132117,9sleep60-21swapper/607:06:006
34309822129114,10sleep00-21swapper/007:07:070
34309412126110,10sleep40-21swapper/407:06:314
3431166212595,10sleep30-21swapper/307:09:433
34311392122106,10sleep70-21swapper/707:09:227
34290702121108,8sleep10-21swapper/107:05:071
34310622120106,9sleep50-21swapper/507:08:165
34314349910318,0cyclictest2945181-21kworker/3:110:02:283
34314219910299,3cyclictest3437785-21snmpd08:28:160
34314219910299,3cyclictest3437785-21snmpd08:14:560
3431421991020,102cyclictest0-21swapper/009:12:180
3431451991010,99cyclictest0-21swapper/710:16:297
3431451991010,101cyclictest0-21swapper/709:13:337
3431451991010,101cyclictest0-21swapper/708:04:097
3431451991010,100cyclictest0-21swapper/710:11:237
34314469910199,1cyclictest3437785-21snmpd07:33:206
3431446991010,100cyclictest0-21swapper/612:09:176
3431446991010,100cyclictest0-21swapper/607:36:216
34314429910199,2cyclictest0-21swapper/510:20:275
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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