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2026-07-09 - 23:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #8

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 rackaslot8s.osadl.org (updated Thu Jul 09, 2026 12:45:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
62752244190,29sleep30-21swapper/307:07:043
6388216296,59sleep20-21swapper/207:08:322
65022158102,28sleep00-21swapper/007:09:580
62782157104,28sleep10-21swapper/107:07:061
167052750,1sleep30-21swapper/310:37:263
196512640,3sleep2271rcuc/211:50:262
36992600,2sleep00-21swapper/009:40:210
299582580,2sleep20-21swapper/211:35:002
51092550,6sleep1211rcuc/109:17:511
80992520,3sleep1211rcuc/110:07:151
80992520,3sleep1211rcuc/110:07:141
289252490,2sleep10-21swapper/111:57:431
95182480,2sleep00-21swapper/009:20:260
319762480,1sleep131977-21sh10:00:321
206012480,1sleep10-21swapper/112:39:401
50402470,1sleep00-21swapper/008:20:160
256982470,1sleep00-21swapper/009:32:550
134182470,1sleep00-21swapper/010:10:470
90282460,2sleep00-21swapper/010:08:110
90282460,2sleep00-21swapper/010:08:100
251122460,1chrt0-21swapper/012:19:000
177382440,3sleep117716-21munin-run11:50:001
7172430,2chrt0-21swapper/012:00:230
179632400,1chrt0-21swapper/110:38:411
63832380,1sleep10-21swapper/109:42:271
227632380,1chrt0-21swapper/311:29:593
281012370,4chrt560-21dbus-daemon08:00:003
677799301,26cyclictest17063-21taskset07:32:142
6775993014,10cyclictest14647-21ssh09:25:120
6775992911,4cyclictest12-21ksoftirqd/009:13:590
6775992910,11cyclictest12-21ksoftirqd/011:55:260
221092290,10sleep012-21ksoftirqd/007:45:120
677699281,25cyclictest0-21swapper/107:21:331
6775992814,4cyclictest12-21ksoftirqd/009:58:570
6775992813,8cyclictest12-21ksoftirqd/009:54:430
274942280,3chrt0-21swapper/212:20:192
677699271,24cyclictest0-21swapper/107:25:541
677599278,8cyclictest141rcu_preempt11:47:490
677599276,4cyclictest12-21ksoftirqd/009:48:120
6775992715,2cyclictest141rcu_preempt11:05:090
6775992712,4cyclictest12-21ksoftirqd/011:24:560
6775992711,4cyclictest12-21ksoftirqd/009:39:040
306822270,2chrt0-21swapper/312:22:493
677899261,23cyclictest0-21swapper/307:20:053
6777992619,5cyclictest25905-21sh09:56:182
677799261,23cyclictest0-21swapper/207:20:332
677799261,23cyclictest0-21swapper/207:18:232
6776992624,1cyclictest0-21swapper/107:33:011
6776992624,1cyclictest0-21swapper/107:20:001
6775992620,4cyclictest131rcuc/010:15:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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