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2026-05-25 - 01:32

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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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 May 24, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
20386721230,3sleep20-21swapper/211:20:112
11504627740,14sleep00-21swapper/007:07:070
11492627740,13sleep30-21swapper/307:05:323
11520327246,16sleep10-21swapper/107:09:091
11512726344,13sleep20-21swapper/207:08:092
2161562570,3sleep30-21swapper/311:55:133
1814652520,2sleep13056-21PK-Backend10:15:131
2107152490,1sleep30-21swapper/311:40:013
1800132440,3sleep13056-21PK-Backend10:10:161
11542699320,19cyclictest147284-21taskset08:39:250
11542699310,16cyclictest0-21swapper/007:33:490
11542699310,16cyclictest0-21swapper/007:33:480
11543599294,13cyclictest0-21swapper/309:54:503
11543599293,17cyclictest215657-21taskset11:54:193
11543599293,16cyclictest175278-21taskset09:59:233
11543599293,10cyclictest185738-21taskset10:26:493
11543599292,18cyclictest189186-21taskset10:36:333
11543599292,16cyclictest125938-21taskset07:36:243
11543599284,8cyclictest222422-21taskset12:12:113
11543599283,9cyclictest138355-21taskset08:11:043
11543599283,16cyclictest194352-21taskset10:51:073
11543599283,10cyclictest190873-21taskset10:40:583
11543599283,10cyclictest170058-21taskset09:44:083
11543599282,13cyclictest143582-21taskset08:26:253
11543599282,13cyclictest129502-21taskset07:46:583
11543599282,12cyclictest200079-21taskset11:09:333
11542699280,15cyclictest0-21swapper/007:28:100
11542699280,15cyclictest0-21swapper/007:10:550
11542699280,12cyclictest0-21swapper/009:25:030
139099270,18rtkit-daemon3056-21PK-Backend11:28:041
11543599274,14cyclictest207036-21taskset11:29:543
11543599273,9cyclictest204987-21taskset11:20:473
11543599273,8cyclictest171549-21taskset09:46:003
11543599273,16cyclictest196560-21taskset10:58:533
11543599273,15cyclictest212500-21taskset11:45:093
11543599273,14cyclictest229237-21taskset12:30:323
11543599273,14cyclictest218867-21taskset12:01:023
11543599273,11cyclictest180597-21taskset10:12:353
11543599273,10cyclictest203581-21taskset11:19:583
11543599272,9cyclictest184010-21taskset10:21:533
11543599272,9cyclictest184010-21taskset10:21:523
11543599272,9cyclictest178892-21taskset10:07:573
11543599272,8cyclictest153916-21taskset08:55:363
11543599272,16cyclictest231248-21taskset12:39:063
11543599272,16cyclictest227600-21runrttasks12:26:563
11543599272,15cyclictest212007-21taskset11:41:563
11543599272,15cyclictest198190-21taskset11:02:353
11543599272,14cyclictest208660-21taskset11:33:273
11543599272,12cyclictest140116-21taskset08:16:253
115426992716,9cyclictest173854-21/usr/sbin/munin09:55:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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