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2026-04-06 - 19:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Mon Apr 06, 2026 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36852920,8sleep32122799cyclictest09:32:263
21227999222,12cyclictest0-21swapper/309:07:573
21227999131,9cyclictest19404-21fschecks_count10:42:433
21227999029,10cyclictest6206-21gltestperf10:22:463
21227999027,13cyclictest0-21swapper/309:52:283
21227999027,13cyclictest0-21swapper/309:22:433
21227999023,12cyclictest0-21swapper/308:07:433
21227998823,12cyclictest0-21swapper/310:33:013
21227998823,12cyclictest0-21swapper/308:47:583
21227998821,12cyclictest0-21swapper/308:33:123
21227998616,27cyclictest3518-21gltestperf08:42:493
226722850,10sleep32122799cyclictest06:32:473
21227998534,8cyclictest31763-21sed10:12:473
21227998531,9cyclictest9879-21missed_timers10:27:523
21227998530,10cyclictest0-21swapper/310:51:413
2122799843,46cyclictest0-21swapper/310:05:283
21227998322,12cyclictest0-21swapper/309:57:443
21227998221,12cyclictest0-21swapper/306:12:553
21227998121,13cyclictest0-21swapper/310:07:443
21227998110,14cyclictest0-21swapper/308:17:313
2122799804,13cyclictest0-21swapper/309:42:263
2122799773,11cyclictest4520-21unixbench_singl07:53:043
2122799754,14cyclictest0-21swapper/305:57:493
21227997532,10cyclictest16482-21sshd07:24:423
21227997527,7cyclictest17742-21cat06:22:373
21227997527,7cyclictest17742-21cat06:22:373
2122799752,22cyclictest0-21swapper/309:54:483
2122799744,14cyclictest0-21swapper/308:17:483
2122799744,14cyclictest0-21swapper/308:17:483
2122599745,61cyclictest0-21swapper/110:30:191
2122799734,15cyclictest0-21swapper/309:14:573
2122799725,14cyclictest0-21swapper/309:32:433
2122799714,15cyclictest0-21swapper/309:02:373
2122799714,15cyclictest0-21swapper/309:02:373
2122599717,58cyclictest0-21swapper/108:45:181
2122599716,58cyclictest0-21swapper/108:07:411
2122599715,59cyclictest0-21swapper/109:27:461
2122599706,57cyclictest0-21swapper/107:48:221
233382699,53sleep20-21swapper/210:00:282
2122799696,13cyclictest0-21swapper/307:43:083
2122799696,13cyclictest0-21swapper/307:43:083
2122599695,57cyclictest0-21swapper/110:23:131
2122599694,57cyclictest0-21swapper/109:47:491
2122599694,13cyclictest0-21swapper/110:07:541
2122599693,59cyclictest0-21swapper/110:48:551
2122599685,56cyclictest0-21swapper/109:47:101
2122599685,56cyclictest0-21swapper/108:52:451
2122599685,55cyclictest10030-21diskstats08:02:481
2122599684,57cyclictest0-21swapper/110:13:061
2122399684,57cyclictest19185-21df10:42:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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