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2025-11-22 - 10:25

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 Sat Nov 22, 2025 00:43:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32296210476,9sleep10-21swapper/119:08:041
3214929682,9sleep30-21swapper/319:06:093
3243128366,13sleep20-21swapper/219:09:492
3211228369,9sleep00-21swapper/019:05:420
32531992322,1cyclictest37850irq/131-snd_hda22:36:312
3253199230,22cyclictest0-21swapper/222:00:072
3253199230,22cyclictest0-21swapper/221:47:332
3253199220,22cyclictest0-21swapper/223:41:052
134282220,1sleep125-21ksoftirqd/121:23:501
3252799215,12cyclictest0-21swapper/121:05:131
3252799210,21cyclictest0-21swapper/100:13:591
32535992018,2cyclictest94-21kswapd021:45:103
3253599193,15cyclictest6197-21sh21:18:493
32531991917,1cyclictest0-21swapper/221:30:132
32535991818,0cyclictest0-21swapper/300:03:083
3253199180,1cyclictest0-21swapper/223:50:362
32531991715,1cyclictest12479-21fschecks_count22:30:162
3253199170,17cyclictest0-21swapper/200:18:082
3252799172,7cyclictest224-21systemd-journal23:11:241
32527991711,2cyclictest0-21swapper/122:34:351
3253599161,12cyclictest0-21swapper/322:30:133
32531991614,2cyclictest0-21swapper/200:35:082
32527991610,6cyclictest0-21swapper/121:45:121
3252799160,1cyclictest0-21swapper/122:35:331
3252299165,8cyclictest25532-21diskmemload21:11:520
3252299160,2cyclictest0-21swapper/021:57:130
3253599152,12cyclictest0-21swapper/300:14:223
32535991512,2cyclictest14735-21sh22:55:003
32535991512,1cyclictest0-21swapper/323:08:443
3253199159,3cyclictest23899-21latency_hist20:00:002
32527991513,2cyclictest25-21ksoftirqd/100:19:071
3252799150,7cyclictest224-21systemd-journal22:30:001
3252299159,3cyclictest4067-21cron23:10:000
3252299150,14cyclictest0-21swapper/021:52:480
32535991410,3cyclictest520-21sh22:00:003
32535991410,3cyclictest21628-21sh22:14:313
32535991410,2cyclictest10015-21cut19:30:153
32531991411,2cyclictest23109-21cstates22:15:152
3253199140,11cyclictest0-21swapper/223:25:162
3252799144,2cyclictest224-21systemd-journal19:50:001
32527991413,1cyclictest0-21swapper/100:03:391
32527991411,2cyclictest25685-21apt21:55:001
32527991410,3cyclictest11125-21grep00:00:001
3252299149,4cyclictest1692-21ssh23:30:150
32522991410,3cyclictest26355-21basename22:40:140
32522991410,3cyclictest22686-21sed21:00:260
32522991410,3cyclictest22686-21sed21:00:260
32522991410,2cyclictest11957-21tr21:45:140
3252299140,7cyclictest969-21idleruntime-cro23:30:000
3253599139,3cyclictest1048-21sort23:30:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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