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2025-09-19 - 00:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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 rack9slot4s (updated Thu Sep 18, 2025 12:59:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
163439911721142,21cyclictest0-21swapper/007:25:040
163449911411108,21cyclictest20786-21apt-get07:35:011
163439911321103,25cyclictest0-21swapper/007:35:010
163449911311121,7cyclictest0-21swapper/107:25:051
162492579532,30sleep00-21swapper/007:24:410
158862465418,32sleep10-21swapper/107:20:501
128142960,7sleep00-21swapper/012:52:470
139012890,8sleep11634499cyclictest08:40:191
212412840,5sleep01634399cyclictest11:20:210
270662690,4sleep00-21swapper/010:19:490
64502520,4sleep00-21swapper/011:05:150
274292500,8sleep01634399cyclictest11:26:210
259702450,5sleep1201rcuc/111:59:191
25022430,4sleep01634399cyclictest11:35:050
1634399411,16cyclictest0-21swapper/010:08:020
16344994024,12cyclictest30944-21snmpd12:30:061
16343993922,6cyclictest3-21ksoftirqd/012:17:390
16343993922,6cyclictest3-21ksoftirqd/009:21:510
16343993822,6cyclictest3-21ksoftirqd/010:45:570
16343993822,6cyclictest3-21ksoftirqd/007:53:440
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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