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2026-07-01 - 06:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 rack7slot7s.osadl.org (updated Wed Jul 01, 2026 00:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2713129573,17sleep30-21swapper/319:07:573
2706029164,9sleep00-21swapper/019:07:020
2701928864,13sleep10-21swapper/119:06:311
2698428672,10sleep20-21swapper/219:06:032
73422660,0sleep30-21swapper/300:33:543
2737499321,5cyclictest225-21systemd-journal21:35:000
2737499321,5cyclictest225-21systemd-journal21:35:000
2737899317,23cyclictest19970-21diskmemload22:24:241
2737899310,3cyclictest6186-21/usr/sbin/munin23:15:221
2737899302,26cyclictest30115-21turbostat.cron21:35:001
2737899302,26cyclictest30115-21turbostat.cron21:34:591
2737899301,1cyclictest0-21swapper/121:15:161
2737899293,22cyclictest225-21systemd-journal21:27:301
2737899293,22cyclictest225-21systemd-journal21:27:301
2737899291,2cyclictest16878-21ssh23:40:261
2737899290,2cyclictest0-21swapper/120:35:131
2737499291,5cyclictest0-21swapper/022:05:140
2737899281,1cyclictest7887-21grep21:40:201
2737899281,1cyclictest19970-21diskmemload00:00:221
2737899280,2cyclictest9931-21cron22:40:001
2737899280,27cyclictest0-21swapper/119:45:131
2737499282,2cyclictest225-21systemd-journal21:55:000
2738099270,27cyclictest0-21swapper/200:31:462
2737899271,1cyclictest19970-21diskmemload00:30:311
2737899270,1cyclictest19970-21diskmemload21:10:161
27374992726,1cyclictest0-21swapper/022:49:130
2737899262,2cyclictest19970-21diskmemload22:27:451
2737899262,23cyclictest8550-21ps19:35:211
2737899261,24cyclictest32318-21df_abs23:50:161
2737899261,24cyclictest28805-21apt-get20:20:141
2737899260,25cyclictest0-21swapper/122:05:151
2737899260,1cyclictest19970-21diskmemload22:57:381
2737899260,1cyclictest19970-21diskmemload00:11:421
2737899260,1cyclictest0-21swapper/123:30:011
240872260,0sleep30-21swapper/300:04:573
2737899254,21cyclictest19970-21diskmemload23:48:021
2737899253,1cyclictest19970-21diskmemload22:51:371
2737899251,1cyclictest0-21swapper/123:20:221
2737899250,2cyclictest0-21swapper/100:39:581
2737899250,24cyclictest0-21swapper/119:25:121
2737899250,24cyclictest0-21swapper/100:20:281
2737899250,1cyclictest19970-21diskmemload21:39:431
2737899250,1cyclictest0-21swapper/123:05:121
2737899250,1cyclictest0-21swapper/121:55:141
27383992419,1cyclictest9938-21apt22:40:003
27383992415,7cyclictest0-21swapper/321:30:233
27383992415,7cyclictest0-21swapper/321:30:233
2738399240,24cyclictest0-21swapper/322:50:273
2738099240,24cyclictest0-21swapper/221:45:562
2737899243,20cyclictest19970-21diskmemload21:46:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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