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2025-12-06 - 23:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 50 highest latencies:
System rack0slot8s.osadl.org (updated Sat Dec 06, 2025 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
275991850,76ptp4l0-21swapper/107:07:541
1578227159,10sleep50-21swapper/507:09:067
1569526655,9sleep110-21swapper/1107:07:473
1557626555,8sleep00-21swapper/007:06:010
1557326553,10sleep100-21swapper/1007:05:582
1582526350,10sleep70-21swapper/707:09:459
1561926353,8sleep40-21swapper/407:06:406
1380126351,9sleep60-21swapper/607:05:198
262842600,0sleep80-21swapper/811:30:2510
143442590,0sleep40-21swapper/412:00:006
252062570,0sleep100-21swapper/1009:25:132
313302560,0sleep60-21swapper/612:20:178
313302560,0sleep60-21swapper/612:20:178
27312550,0sleep70-21swapper/707:30:229
174372540,0sleep50-21swapper/508:30:277
1625299320,1cyclictest0-21swapper/1008:10:272
1622499240,9cyclictest0-21swapper/411:15:016
1622499211,15cyclictest0-21swapper/407:50:006
1622499201,14cyclictest0-21swapper/411:10:006
275991170,1ptp4l21-21ksoftirqd/111:30:211
1623399173,9cyclictest0-21swapper/607:35:028
1621599172,9cyclictest0-21swapper/207:55:264
275991160,0ptp4l0-21swapper/112:10:161
275991160,0ptp4l0-21swapper/109:10:141
1624399163,8cyclictest0-21swapper/810:20:0010
1623399164,8cyclictest7243-21kworker/u24:112:40:018
1623399164,8cyclictest7243-21kworker/u24:112:40:008
1623399161,9cyclictest0-21swapper/609:25:008
1621199163,8cyclictest0-21swapper/109:50:011
1621199162,9cyclictest0-21swapper/109:30:011
1621199161,11cyclictest7243-21kworker/u24:111:50:001
1620699162,9cyclictest0-21swapper/008:50:000
275991150,1ptp4l21-21ksoftirqd/107:10:231
275991150,0ptp4l0-21swapper/107:20:191
1625799153,8cyclictest0-21swapper/1108:15:263
1625799152,8cyclictest0-21swapper/1110:20:003
1625799150,3cyclictest0-21swapper/1109:35:203
1624399153,7cyclictest0-21swapper/809:20:0010
1623999153,8cyclictest0-21swapper/712:15:009
1623399153,7cyclictest0-21swapper/608:10:028
1622999153,8cyclictest0-21swapper/510:40:017
1621599152,9cyclictest0-21swapper/212:35:014
1621599152,9cyclictest0-21swapper/212:35:004
1621599150,8cyclictest0-21swapper/210:00:014
1621599150,11cyclictest0-21swapper/210:05:014
1621199152,8cyclictest0-21swapper/110:45:001
1621199152,8cyclictest0-21swapper/109:45:011
1621199152,8cyclictest0-21swapper/108:40:251
1621199152,7cyclictest0-21swapper/108:25:021
1620699154,7cyclictest0-21swapper/008:25:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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