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2026-01-11 - 12:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Sun Jan 11, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1577003214455,84sleep30-21swapper/319:06:443
172301621350,2sleep00-21swapper/021:25:120
157696329780,9sleep10-21swapper/119:06:151
157714528057,6sleep00-21swapper/019:08:310
157227727661,9sleep20-21swapper/219:05:032
1577382992823,2cyclictest0-21swapper/321:40:113
157738299224,11cyclictest1730568-21taskset21:30:173
157738299222,10cyclictest17977821taskset22:35:223
157738299221,17cyclictest1833458-21turbostat23:10:003
1577382992118,1cyclictest0-21swapper/323:55:113
157738299211,16cyclictest1600369-21sleep19:30:013
1577382992015,3cyclictest0-21swapper/320:25:133
1577382992014,4cyclictest0-21swapper/319:45:193
157738299201,15cyclictest228-1kworker/3:1H+kblockd23:18:193
157738299201,15cyclictest1632285-21turbostat19:59:593
157738299201,14cyclictest0-21swapper/323:29:243
157738299194,10cyclictest1912627-21taskset00:25:123
157738299193,2cyclictest0-21swapper/323:40:203
157738299193,13cyclictest0-21swapper/321:35:113
157738299193,10cyclictest1643308-21taskset20:10:013
157738299193,10cyclictest1622020-21taskset19:50:013
157738299192,14cyclictest0-21swapper/300:05:213
157738299191,14cyclictest0-21swapper/321:25:113
157738299191,13cyclictest0-21swapper/320:15:123
157738299190,15cyclictest1669943-21sleep20:35:003
157738299183,11cyclictest1928065-21turbostat00:40:003
157738299183,11cyclictest1859636-21sleep23:35:003
157738299183,11cyclictest1749651-21chrt21:50:133
157738299183,11cyclictest1643092-21sleep20:09:593
157738299183,11cyclictest15850irq/127-ahci[0000:00:17.0]20:22:483
157738299183,10cyclictest1907415-21taskset00:20:103
157738299183,10cyclictest1816496-21taskset22:50:203
1577382991815,1cyclictest0-21swapper/321:10:193
1577382991812,2cyclictest0-21swapper/320:35:133
157738299181,14cyclictest0-21swapper/323:10:193
157738299181,14cyclictest0-21swapper/321:55:193
157738299181,13cyclictest1886453-21chrt00:00:113
157738299181,13cyclictest1827967-21turbostat23:04:593
157738299181,13cyclictest1582604-21turbostat19:15:003
157738299181,13cyclictest1582604-21turbostat19:14:593
157738299181,13cyclictest0-21swapper/323:50:123
157738299181,13cyclictest0-21swapper/322:15:113
157738299181,13cyclictest0-21swapper/321:20:113
157738299180,14cyclictest0-21swapper/322:30:093
157738299177,3cyclictest16801502sleep320:41:193
157738299176,8cyclictest1743889-21turbostat21:49:553
157738299175,9cyclictest1812155-21turbostat22:50:013
157738299174,2cyclictest0-21swapper/322:05:203
157738299173,9cyclictest1680775-21taskset20:45:123
157738299173,11cyclictest1611462-21chrt19:40:033
157738299173,10cyclictest1875740-21chrt23:50:003
157738299173,10cyclictest1717369-21turbostat21:20:003
157738299173,10cyclictest1695093-21chrt20:55:183
157738299172,11cyclictest1610673-21chrt19:36:573
157738299172,10cyclictest1701339-21taskset21:04:553
157738299171,13cyclictest228-1kworker/3:1H+kblockd19:31:493
157738299171,13cyclictest0-21swapper/320:50:143
157738299171,12cyclictest228-1kworker/3:1H+kblockd19:22:353
157738299171,12cyclictest1865127-21turbostat23:40:003
157738299171,12cyclictest1701627-21chrt21:05:123
157738299171,12cyclictest0-21swapper/322:40:213
18268452161,9sleep21826933-21ntpq23:00:182
17600492160,1sleep10-21swapper/122:00:141
157738299164,3cyclictest0-21swapper/323:22:223
157738299163,9cyclictest1906809-21taskset00:16:143
157738299163,9cyclictest1637430-21taskset20:04:123
157738299161,9cyclictest1764641-21taskset22:03:243
1577382991613,2cyclictest0-21swapper/319:15:013
1577382991612,2cyclictest0-21swapper/300:30:253
157738299161,13cyclictest0-21swapper/322:25:213
157738299160,13cyclictest0-21swapper/322:55:213
18756022151,9sleep21875737-21cat23:50:002
17551482151,9sleep01755961-21grep21:55:160
16441212151,6sleep01645791-21kthreadcore20:10:180
16380332151,3sleep21638052-21apt-get20:05:122
16156162151,9sleep21615695-21ps19:40:232
1577382991512,2cyclictest0-21swapper/300:10:173
157738299150,12cyclictest0-21swapper/322:20:113
157738299150,12cyclictest0-21swapper/322:10:273
18134912141,4sleep11815178-21cut22:50:161
17598392141,4sleep01760048-21expr22:00:120
17341822144,5sleep01734496-21kthreadcore21:35:150
16635872140,2sleep2421rcuc/220:25:192
16436042141,8sleep11643324-21/usr/sbin/munin20:10:151
19076832131,8sleep11907865-21gltestperf00:20:131
18504942131,8sleep21852193-21kthreadcore23:25:152
17917802131,7sleep21791985-21sed22:30:122
15814782132,5sleep01581566-21ntpq19:10:190
15814782132,5sleep01581566-21ntpq19:10:180
18764312121,7sleep11877429-21kthreadcore23:50:161
18499562126,3sleep10-21swapper/123:25:141
18442202120,1sleep00-21swapper/023:20:130
18389372121,5sleep01838956-21apt-get23:15:110
17179192121,7sleep11717955-21fschecks_count21:20:141
16491542121,7sleep11649891-21cut20:15:171
15947982120,2sleep20-21swapper/219:21:352
19183482111,6sleep01918431-21kernelversion00:30:150
19070592111,7sleep10-21swapper/100:19:221
18546442111,5sleep11854663-21apt-get23:30:121
18111062111,5sleep21811152-21ntpq22:45:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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