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2026-01-09 - 20:20

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 Fri Jan 09, 2026 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
640564212566,55sleep30-21swapper/307:05:463
64056128355,20sleep00-21swapper/007:05:430
64063628267,9sleep20-21swapper/207:06:412
64067927762,9sleep10-21swapper/107:07:121
7917432270,3sleep2791747-21fschecks_count09:30:132
641039992623,1cyclictest0-21swapper/308:30:003
641039992522,1cyclictest0-21swapper/308:45:113
64103999240,20cyclictest733618-21chrt08:34:593
64103999231,18cyclictest0-21swapper/309:40:113
641039992219,1cyclictest0-21swapper/312:15:253
641039992219,1cyclictest0-21swapper/310:00:003
641039992219,1cyclictest0-21swapper/310:00:003
64103999212,12cyclictest926467-21taskset11:35:153
641039992118,1cyclictest0-21swapper/312:00:253
641039992018,1cyclictest0-21swapper/307:25:013
641039992017,1cyclictest0-21swapper/311:55:173
64103999200,14cyclictest8336222sleep310:10:113
641039991916,1cyclictest0-21swapper/308:05:143
641039991916,1cyclictest0-21swapper/307:36:303
641039991915,2cyclictest0-21swapper/308:05:013
64103999191,14cyclictest0-21swapper/312:30:053
64103999182,10cyclictest738915-21taskset08:40:003
641039991815,1cyclictest0-21swapper/311:00:003
641039991815,1cyclictest0-21swapper/309:45:103
641039991815,1cyclictest0-21swapper/309:10:163
641039991815,1cyclictest0-21swapper/308:55:133
641039991814,2cyclictest0-21swapper/311:15:163
64103999181,14cyclictest0-21swapper/311:05:123
64103999181,13cyclictest717901-21sleep08:20:003
64103999181,13cyclictest0-21swapper/311:30:113
64103999181,13cyclictest0-21swapper/309:00:103
9585032170,2sleep20-21swapper/212:05:212
9585032170,2sleep20-21swapper/212:05:212
64103999177,6cyclictest685814-21taskset07:46:413
64103999174,11cyclictest0-21swapper/309:30:203
641039991715,1cyclictest0-21swapper/312:10:163
641039991715,1cyclictest0-21swapper/307:40:153
641039991714,1cyclictest0-21swapper/312:25:173
641039991713,1cyclictest0-21swapper/311:40:223
64103999171,14cyclictest0-21swapper/307:30:103
64103999171,13cyclictest0-21swapper/310:40:113
64103999171,13cyclictest0-21swapper/310:05:193
64103999171,13cyclictest0-21swapper/308:20:253
64103999171,12cyclictest938376-21chrt11:50:103
64103999171,12cyclictest901452-21turbostat11:15:013
64103999171,10cyclictest853090-21taskset10:25:173
64103999170,13cyclictest0-21swapper/311:00:103
64103999170,10cyclictest790956-21taskset09:27:263
7535462161,4sleep2753595-21ntpq08:50:182
641039991614,1cyclictest0-21swapper/307:55:183
64103999161,3cyclictest959443-21sleep12:10:013
64103999161,3cyclictest959443-21sleep12:10:003
641039991613,2cyclictest0-21swapper/310:35:143
641039991613,1cyclictest0-21swapper/310:20:013
641039991612,2cyclictest0-21swapper/311:45:133
64103999161,13cyclictest0-21swapper/312:20:123
64103999161,12cyclictest691337-21sleep07:55:003
64103999161,11cyclictest770217-21turbostat09:10:003
64103999161,11cyclictest663380-21chrt07:25:213
64103999161,11cyclictest0-21swapper/308:53:543
64103999161,10cyclictest828105-21taskset10:04:253
64103999161,10cyclictest812665-21taskset09:50:023
64103999160,13cyclictest0-21swapper/312:35:103
64103999160,13cyclictest0-21swapper/311:20:173
64103999160,13cyclictest0-21swapper/308:40:153
9389002151,9sleep2939408-21grep11:50:142
8428722151,10sleep0842991-21grep10:15:210
8076492151,10sleep2807761-21cut09:45:132
64103999151,9cyclictest874874-21taskset10:45:293
64103999151,9cyclictest847819-21taskset10:20:163
64103999151,9cyclictest785637-21taskset09:21:003
641039991513,1cyclictest0-21swapper/311:25:163
64103999151,2cyclictest0-21swapper/310:33:163
64103999151,11cyclictest6461762sleep307:14:143
64103999151,10cyclictest648331-21chrt07:15:033
641039991510,3cyclictest0-21swapper/310:50:123
64103999150,13cyclictest0-21swapper/308:10:123
64103999150,12cyclictest0-21swapper/309:35:123
64103999150,12cyclictest0-21swapper/309:15:133
9739452141,9sleep1974034-21ntpq12:20:191
8962032141,8sleep0896230-21perf11:10:000
8797982141,8sleep2879900-21sed10:50:262
7553162141,9sleep2755429-21tr08:55:152
7171652141,8sleep0717223-21cat08:15:250
7169642141,3sleep1717055-21ps08:15:221
6649782147,3sleep2665149-21cat07:30:142
9844952122,5sleep0984541-21ntpq12:30:200
7462022121,7sleep10-21swapper/108:45:161
7391352122,5sleep1739154-21apt-get08:40:111
7341632120,7sleep2734372-21expr08:35:112
6746572121,2sleep2674564-31sort07:36:392
6538242121,8sleep10-21swapper/107:20:111
9863192110,7sleep1986904-21grep12:35:151
9541412110,1sleep00-21swapper/012:04:350
8650052112,4sleep1865024-21apt-get10:40:111
7970632111,6sleep1797214-21/usr/sbin/munin09:35:141
7914472111,5sleep0791699-21df09:30:120
6973892111,6sleep1698114-21kthreadcore08:00:151
6759592111,5sleep0676063-21irqstats07:40:140
6746452111,5sleep0674605-31find07:36:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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