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2026-07-05 - 09:45

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 Jul 05, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
262668922200,12sleep342-21ksoftirqd/319:05:273
265123121170,7sleep126-21ksoftirqd/120:15:151
273507921060,4sleep13056-21PK-Backend00:10:221
262654527548,17sleep10-21swapper/119:05:251
262709126342,14sleep00-21swapper/019:09:350
262679726242,14sleep20-21swapper/219:05:472
27071822490,3sleep30-21swapper/322:55:013
26305462480,2sleep10-21swapper/119:15:211
26975232420,3sleep20-21swapper/222:25:202
27384362350,3sleep20-21swapper/200:20:202
26576052340,11sleep234-21ksoftirqd/220:35:002
27303672300,4sleep33056-21PK-Backend00:00:013
2627255992313,6cyclictest2716468-21apt23:20:103
2627251992315,6cyclictest2645931-21df20:00:122
262725199230,21cyclictest978-21snmpd21:48:062
262724799231,21cyclictest0-21swapper/121:30:011
2627245992316,5cyclictest2640093-21cron19:45:010
2627245992315,6cyclictest883-21dbus-daemon20:45:010
139099230,16rtkit-daemon3056-21PK-Backend21:53:513
139099230,15rtkit-daemon0-21swapper/222:05:282
2627255992220,1cyclictest3056-21PK-Backend20:08:193
2627255992220,1cyclictest0-21swapper/320:56:183
2627255992219,2cyclictest3056-21PK-Backend21:38:443
2627255992219,2cyclictest3056-21PK-Backend20:41:393
2627251992218,3cyclictest34-21ksoftirqd/200:00:002
262725199220,20cyclictest0-21swapper/221:11:292
2627247992220,1cyclictest0-21swapper/122:27:061
2627245992220,1cyclictest0-21swapper/023:37:060
2627245992220,1cyclictest0-21swapper/020:04:550
2627245992220,1cyclictest0-21swapper/000:21:140
262724599221,15cyclictest2652508-21chrt20:20:120
2627245992210,10cyclictest2648797-21unin-run20:10:000
262724599220,21cyclictest0-21swapper/019:17:510
262724599220,20cyclictest1788620-21WebKitWebProces19:52:320
2627255992119,1cyclictest3056-21PK-Backend22:26:493
2627255992119,1cyclictest3056-21PK-Backend22:14:063
2627255992119,1cyclictest3056-21PK-Backend21:09:233
2627255992119,1cyclictest3056-21PK-Backend20:48:353
2627255992119,1cyclictest0-21swapper/300:15:523
2627255992119,1cyclictest0-21swapper/300:10:453
2627255992118,2cyclictest3056-21PK-Backend23:28:013
262725599210,20cyclictest3056-21PK-Backend20:37:133
262725599210,20cyclictest0-21swapper/320:50:303
262725599210,20cyclictest0-21swapper/319:41:363
262725599210,20cyclictest0-21swapper/319:19:533
262725599210,19cyclictest3056-21PK-Backend20:20:153
262725599210,19cyclictest0-21swapper/323:10:023
2627251992119,1cyclictest0-21swapper/221:02:362
2627251992117,2cyclictest2651508-21ntp_states20:15:192
2627251992112,6cyclictest2641406-21runrttasks19:45:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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