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2026-05-24 - 18:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 50 highest latencies:
System rack7slot7s.osadl.org (updated Sun May 24, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1711029684,8sleep00-21swapper/007:07:230
1716129369,13sleep10-21swapper/107:08:041
1706028976,9sleep20-21swapper/207:06:442
1702428570,9sleep30-21swapper/307:06:163
1740399260,25cyclictest0-21swapper/212:26:072
1740399250,25cyclictest0-21swapper/211:09:022
1740399250,16cyclictest0-21swapper/212:01:242
1740399240,24cyclictest0-21swapper/210:31:332
1740399240,24cyclictest0-21swapper/210:31:322
1740399230,23cyclictest0-21swapper/210:36:402
1740399230,22cyclictest0-21swapper/210:05:122
17401992222,0cyclictest0-21swapper/110:39:261
17396992222,0cyclictest0-21swapper/010:15:480
17406992019,1cyclictest145562sleep309:30:583
1740699200,19cyclictest0-21swapper/311:10:083
1740399200,20cyclictest0-21swapper/212:32:002
17401992017,2cyclictest537-21snmpd12:14:361
1739699200,6cyclictest0-21swapper/012:32:180
17406991917,1cyclictest0-21swapper/310:54:163
1740699191,16cyclictest24066-21ssh10:35:083
1740199198,1cyclictest141rcu_preempt12:33:021
1740199182,2cyclictest0-21swapper/108:40:121
17401991818,0cyclictest0-21swapper/111:21:261
17401991816,1cyclictest537-21snmpd09:39:571
17401991812,3cyclictest0-21swapper/110:30:471
17401991812,3cyclictest0-21swapper/110:30:461
1740199180,2cyclictest10195-21diskmemload11:32:421
30592170,1sleep20-21swapper/211:40:022
1740699173,10cyclictest20309-21wget09:35:133
17403991715,2cyclictest32-21ksoftirqd/210:59:252
1740399170,17cyclictest0-21swapper/211:19:352
1740399170,17cyclictest0-21swapper/210:20:252
1740399170,17cyclictest0-21swapper/209:24:392
1740199174,9cyclictest0-21swapper/108:25:141
1740199170,15cyclictest0-21swapper/108:35:141
17406991614,1cyclictest11538-21ssh10:08:153
17406991611,3cyclictest3748-21chrt11:20:213
1740399162,1cyclictest225-21systemd-journal09:49:592
1740399160,16cyclictest0-21swapper/212:14:532
17401991614,1cyclictest0-21swapper/109:55:491
17396991615,1cyclictest0-21swapper/011:11:360
1740699151,4cyclictest225-21systemd-journal11:39:543
1740399154,9cyclictest0-21swapper/210:15:032
1740399152,10cyclictest55650irq/127-enp2s0-10:45:132
1740399150,3cyclictest0-21swapper/211:28:232
17401991515,0cyclictest0-21swapper/110:10:291
17401991515,0cyclictest0-21swapper/109:53:071
17401991514,1cyclictest0-21swapper/109:23:421
1740199150,15cyclictest0-21swapper/112:09:181
1739699158,6cyclictest18778-21awk08:19:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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