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2026-05-22 - 01:21

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 Thu May 21, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
270785321290,4sleep10-21swapper/112:00:151
261048421190,2sleep30-21swapper/307:25:133
260328321030,8sleep23056-21PK-Backend07:05:262
139099770,61rtkit-daemon0-21swapper/007:05:260
260371327659,10sleep30-21swapper/307:08:013
260350827639,9sleep10-21swapper/107:05:301
26155342550,2sleep30-21swapper/307:40:013
26155342550,2sleep30-21swapper/307:40:003
26550832490,5sleep22655079-21ntp_kernel_pll_09:30:182
26640302480,2sleep33056-21PK-Backend09:55:173
26838472400,3sleep234-21ksoftirqd/210:50:192
27144992330,6sleep2341ksoftirqd/212:20:012
2604000992616,8cyclictest2627500-21spatcher08:11:112
260400099256,4cyclictest34-21ksoftirqd/210:14:592
26515352230,2sleep30-21swapper/309:20:173
2604005992320,1cyclictest3056-21PK-Backend08:08:413
260400599230,21cyclictest3056-21PK-Backend11:58:033
2603997992315,5cyclictest2660489-21needreboot09:45:181
2603997992314,7cyclictest883-21dbus-daemon12:30:011
2603997992314,7cyclictest2721323-21cron12:40:001
2603995992315,6cyclictest436-20systemd-journal09:20:000
260399599230,21cyclictest2612236-21expr07:30:120
26356552220,10sleep234-21ksoftirqd/208:35:132
2604005992220,1cyclictest3056-21PK-Backend11:23:033
2604005992220,1cyclictest3056-21PK-Backend08:53:103
260400599220,20cyclictest3056-21PK-Backend12:01:563
260400599220,20cyclictest3056-21PK-Backend10:15:093
260400599220,20cyclictest3056-21PK-Backend10:05:423
260400599220,20cyclictest3056-21PK-Backend08:14:103
2604000992214,6cyclictest2630690-21python308:20:202
2604000992213,7cyclictest883-21dbus-daemon07:11:112
2604000992211,10cyclictest2716108-21cron12:25:002
260400099220,20cyclictest2606025-21python307:15:022
2603997992216,4cyclictest2654904-21wc09:30:171
2603997992215,5cyclictest2643672-21latency_hist09:00:011
2603997992214,6cyclictest2681113-21cron10:45:011
2603997992214,6cyclictest2659345-21mktemp09:45:001
2603997992213,6cyclictest2622598-21cron07:59:591
260399799220,21cyclictest2714659-21apt12:20:111
139099220,3rtkit-daemon0-21swapper/007:58:530
26699992210,4sleep342-21ksoftirqd/310:10:183
2604005992119,1cyclictest3056-21PK-Backend10:35:023
2604005992119,1cyclictest3056-21PK-Backend07:58:283
2604005992119,1cyclictest0-21swapper/309:35:083
2604005992119,1cyclictest0-21swapper/308:23:023
2604005992118,2cyclictest3056-21PK-Backend08:59:453
2604005992118,2cyclictest3056-21PK-Backend08:25:183
260400599210,2cyclictest3056-21PK-Backend10:40:103
260400599210,20cyclictest3056-21PK-Backend11:12:013
260400599210,20cyclictest0-21swapper/310:56:053
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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