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2025-08-30 - 00:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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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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.

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 rack7slot3s.osadl.org (updated Fri Aug 29, 2025 12:43:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
75121670,7sleep13258199cyclictest09:40:361
2873821140,3sleep028740-21unixbench_singl10:20:370
143482830,2sleep10-21swapper/111:35:181
148672810,8sleep23258299cyclictest10:50:062
273682790,2sleep30-21swapper/309:31:403
156412790,2sleep015640-21/usr/sbin/munin10:50:280
150052790,6sleep13258199cyclictest07:50:261
32580997525,7cyclictest0-21swapper/009:55:180
32580997359,3cyclictest8150irq/56-dwc_otg_10:55:110
32580997359,3cyclictest8150irq/56-dwc_otg_10:55:110
3258099731,36cyclictest0-21swapper/008:20:180
32582996914,22cyclictest10233-21ssh09:55:182
183082680,2sleep00-21swapper/011:40:240
32580996617,30cyclictest32158-21unixbench_multi08:35:350
3258099661,30cyclictest30823-21latency_hist08:35:050
3258099661,26cyclictest0-21swapper/007:20:170
11452660,4sleep21146-21fschecks_count12:00:232
298102640,2sleep10-21swapper/108:30:271
3258299632,16cyclictest0-21swapper/207:35:212
3258099635,37cyclictest0-21swapper/011:10:180
3258099614,33cyclictest0-21swapper/011:55:320
32580996126,4cyclictest0-21swapper/010:05:210
3258099601,6cyclictest32219-21ssh09:40:060
3258099601,36cyclictest14851-21ssh10:50:060
3258099593,30cyclictest7128-21head08:55:350
3258399585,7cyclictest0-21swapper/308:35:183
3258199586,9cyclictest7950irq/56-dwc_otg07:15:181
32580995811,10cyclictest0-21swapper/009:30:200
3258399572,8cyclictest7950irq/56-dwc_otg10:40:183
3258099561,26cyclictest7724-21latency_hist10:40:050
32581995517,21cyclictest26685-21ls08:20:331
32580995528,5cyclictest14007-21ssh11:35:050
3258099551,39cyclictest10531-21cron11:30:050
3258099551,30cyclictest11258-21diskmemload11:50:260
3258299547,5cyclictest8150irq/56-dwc_otg_08:20:182
3258299547,31cyclictest13865-21ssh10:00:202
3258299547,31cyclictest13865-21ssh10:00:202
32580995428,15cyclictest0-21swapper/009:05:340
3258099541,40cyclictest0-21swapper/008:45:360
32580995413,20cyclictest17089-21ls12:20:050
3258099541,31cyclictest6382-21grep07:25:290
3258099541,31cyclictest6382-21grep07:25:290
3258099541,30cyclictest15529-21latency09:15:280
3258099541,19cyclictest23031-21timerwakeupswit08:10:330
3258399537,30cyclictest14358-21ssh11:35:203
3258199539,26cyclictest8650-21ssh09:52:141
32581995320,14cyclictest5096-21ls08:50:511
32581995311,22cyclictest30232-21ssh11:10:291
3258099538,17cyclictest0-21swapper/010:40:180
32580995326,6cyclictest8050irq/56-dwc_otg_12:30:340
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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