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2026-09-06 - 15:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 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 rackcslot7s.osadl.org (updated Sun Sep 06, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
139099860,72rtkit-daemon0-21swapper/207:05:252
73122428443,33sleep00-21swapper/007:05:140
7430002770,1sleep00-21swapper/007:36:460
73213327640,13sleep10-21swapper/107:07:481
73154227646,21sleep30-21swapper/307:05:213
8276052510,3sleep00-21swapper/011:35:170
7922662490,2sleep00-21swapper/009:55:130
7975342440,2sleep20-21swapper/210:10:142
8158262360,2sleep23056-21PK-Backend11:00:232
7475252290,9sleep234-21ksoftirqd/207:50:152
8118302270,4sleep126-21ksoftirqd/110:50:151
732442992723,3cyclictest161rcuc/009:05:460
7433572240,8chrt26-21ksoftirqd/107:40:001
732450992415,7cyclictest823271-21unin-run11:25:012
73244299242,6cyclictest13-21ksoftirqd/012:21:500
73244299242,6cyclictest13-21ksoftirqd/012:21:500
732442992412,10cyclictest765704-21tr08:40:170
732450992314,7cyclictest436-20systemd-journal12:05:002
732442992314,7cyclictest1-21systemd10:49:590
139099230,16rtkit-daemon3056-21PK-Backend07:22:003
8045162220,3sleep33056-21PK-Backend10:30:123
8014442220,4sleep30-21swapper/310:20:173
732450992220,1cyclictest0-21swapper/208:53:522
732450992220,1cyclictest0-21swapper/207:22:212
732450992214,6cyclictest791646-21apt-key09:55:012
732447992220,1cyclictest0-21swapper/112:26:321
732447992220,1cyclictest0-21swapper/112:07:121
732447992220,1cyclictest0-21swapper/111:22:031
732447992220,1cyclictest0-21swapper/110:46:201
732447992220,1cyclictest0-21swapper/107:14:091
732447992219,2cyclictest3056-21PK-Backend11:18:041
732447992219,2cyclictest0-21swapper/108:02:151
732447992214,6cyclictest791993-21apt09:55:111
732447992210,3cyclictest846199-21tr12:30:121
732447992210,3cyclictest846199-21tr12:30:111
73244799220,21cyclictest7985662sleep110:13:151
73244299224,7cyclictest13-21ksoftirqd/007:30:150
73244299224,10cyclictest13-21ksoftirqd/008:00:000
73244299223,6cyclictest13-21ksoftirqd/008:00:130
732442992220,1cyclictest0-21swapper/009:00:420
732442992220,1cyclictest0-21swapper/008:26:220
73244299220,6cyclictest3056-21PK-Backend11:50:140
139099220,3rtkit-daemon0-21swapper/210:45:122
73245299215,5cyclictest3056-21PK-Backend10:59:493
732452992119,1cyclictest3056-21PK-Backend07:31:513
732452992119,1cyclictest0-21swapper/307:43:333
732452992118,2cyclictest3056-21PK-Backend08:08:213
73245299211,7cyclictest845384-21users12:25:233
732452992114,6cyclictest764896-21http08:39:443
73245299210,20cyclictest3056-21PK-Backend09:25:473
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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