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2026-05-24 - 17:52

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 100 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
11542699271,24cyclictest206643-21timerwakeupswit11:25:230
11542699270,14cyclictest0-21swapper/011:30:220
2094942260,3chrt0-21swapper/211:35:152
11543599264,7cyclictest122420-21taskset07:25:453
11543599263,9cyclictest192612-21taskset10:46:023
11543599263,10cyclictest201642-21taskset11:12:223
11543599263,10cyclictest182469-21taskset10:19:203
11543599262,9cyclictest168347-21taskset09:39:223
11543599262,9cyclictest165170-21taskset09:30:033
11543599262,9cyclictest148859-21taskset08:42:243
11543599262,9cyclictest141951-21taskset08:22:443
11543599262,8cyclictest224309-21taskset12:19:093
11543599262,16cyclictest136702-21taskset08:07:083
11542699269,16cyclictest147886-21expr08:40:110
11542699260,14cyclictest0-21swapper/009:14:200
11542699260,13cyclictest0-21swapper/009:01:330
1580982250,3sleep00-21swapper/009:10:000
11543599252,9cyclictest127729-21taskset07:41:253
11543599252,14cyclictest225909-21taskset12:22:263
11543599252,14cyclictest187465-21runrttasks10:31:443
11543599252,14cyclictest150676-21taskset08:48:293
11543599252,11cyclictest152400-21taskset08:53:233
11543599252,10cyclictest220886-21runrttasks12:09:443
11542699258,16cyclictest166689-21turbostat09:34:590
115426992512,11cyclictest144545-21sh08:30:140
115426992511,12cyclictest190545-21cut10:40:190
11542699251,10cyclictest191199-21perf10:49:550
11542699248,15cyclictest126239-21file07:39:550
115426992413,10cyclictest171150-21ntp_states09:45:180
11542699240,23cyclictest0-21swapper/010:16:510
139099230,4rtkit-daemon3056-21PK-Backend08:51:181
139099230,15rtkit-daemon3056-21PK-Backend12:31:071
139099230,15rtkit-daemon0-21swapper/010:08:330
11543599233,8cyclictest177124-21taskset10:02:273
11543599232,8cyclictest164889-21runrttasks09:29:403
115428992320,2cyclictest3056-21PK-Backend11:57:321
11542699235,16cyclictest186608-21expr10:30:130
11542699232,17cyclictest175874-21apt10:00:100
139099220,15rtkit-daemon3056-21PK-Backend07:24:561
115432992220,1cyclictest0-21swapper/212:06:222
115432992220,1cyclictest0-21swapper/210:14:412
115432992214,6cyclictest436-20systemd-journal08:05:002
115432992214,6cyclictest201788-21sshd11:14:172
11543299220,20cyclictest192548-21users10:45:242
115428992220,1cyclictest3056-21PK-Backend11:43:531
115428992220,1cyclictest3056-21PK-Backend11:09:261
115428992220,1cyclictest3056-21PK-Backend09:40:301
115428992220,1cyclictest0-21swapper/108:37:101
115428992220,1cyclictest0-21swapper/107:36:141
11542899221,12cyclictest1862692apt10:30:111
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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