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2026-05-05 - 02:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Tue May 05, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
150742241163,25sleep20-21swapper/219:08:412
151602236163,23sleep10-21swapper/119:09:501
150572223192,21sleep00-21swapper/019:08:280
151372204168,24sleep30-21swapper/319:09:313
2158821520,2sleep21526899cyclictest19:20:202
296521490,1sleep20-21swapper/219:50:272
1258021350,4sleep01525499cyclictest20:15:120
15268999390,2cyclictest0-21swapper/220:52:272
15268998884,3cyclictest0-21swapper/221:26:392
15268998784,2cyclictest0-21swapper/200:14:232
15268997471,2cyclictest0-21swapper/220:05:302
15268996966,2cyclictest0-21swapper/223:32:432
15268995652,3cyclictest0-21swapper/219:17:452
1526299361,14cyclictest28754-21kworker/u8:220:52:371
1527499331,2cyclictest0-21swapper/321:27:113
174322320,5sleep0909-21sssd_nss00:05:240
1527499321,20cyclictest0-21swapper/300:21:593
1527499311,14cyclictest0-21swapper/322:03:393
15262993112,12cyclictest0-21swapper/120:40:531
1526299311,12cyclictest0-21swapper/120:35:251
1526299311,11cyclictest0-21swapper/100:21:301
1525499318,11cyclictest25967-21basename22:00:010
1527499301,15cyclictest0-21swapper/320:27:503
1527499301,14cyclictest0-21swapper/320:57:563
1527499301,14cyclictest0-21swapper/320:51:323
1527499301,13cyclictest0-21swapper/323:44:323
1527499301,13cyclictest0-21swapper/322:06:073
1527499301,12cyclictest0-21swapper/321:06:273
1527499301,11cyclictest0-21swapper/319:38:513
1527499300,15cyclictest0-21swapper/319:41:193
1527499300,13cyclictest0-21swapper/320:24:443
1526299301,6cyclictest0-21swapper/122:33:571
1526299301,12cyclictest0-21swapper/119:34:261
1526299301,11cyclictest15670-21open_inodes20:20:211
1526299301,11cyclictest0-21swapper/123:40:451
1525499305,12cyclictest31922-21munin-run21:00:020
15254993010,16cyclictest22826-21munin-run00:20:010
101942300,3sleep30-21swapper/323:50:133
1527499291,13cyclictest0-21swapper/322:22:393
1527499291,13cyclictest0-21swapper/319:26:433
1527499291,13cyclictest0-21swapper/300:28:353
1527499291,12cyclictest0-21swapper/323:58:193
1527499291,12cyclictest0-21swapper/323:58:193
1527499291,12cyclictest0-21swapper/323:48:073
1527499291,12cyclictest0-21swapper/322:59:283
1527499291,12cyclictest0-21swapper/320:41:483
1527499291,12cyclictest0-21swapper/320:13:163
1527499291,12cyclictest0-21swapper/300:36:393
1527499291,11cyclictest0-21swapper/323:18:523
1527499291,11cyclictest0-21swapper/322:31:313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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