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2026-01-10 - 01:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Fri Jan 09, 2026 12:44:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1427721280,4chrt0-21swapper/312:10:413
1427721280,4chrt0-21swapper/312:10:413
98062960,3sleep3431rcuc/309:05:403
232662820,1sleep3431rcuc/312:35:383
232662820,1sleep3431rcuc/312:35:383
267692780,3chrt0-21swapper/108:25:341
267692780,3chrt0-21swapper/108:25:341
146852660,2sleep014856-21unixbench-2d07:50:490
146852660,2sleep014856-21unixbench-2d07:50:490
44332640,2chrt4432-21grep10:15:480
44332640,2chrt4432-21grep10:15:480
208232640,2sleep00-21swapper/011:00:470
208232640,2sleep00-21swapper/011:00:470
177612610,2chrt0-21swapper/012:20:390
15282610,3chrt0-21swapper/008:43:340
15282610,3chrt0-21swapper/008:43:340
241292530,3sleep00-21swapper/009:45:210
241292530,3sleep00-21swapper/009:45:210
86002520,3sleep10-21swapper/109:00:481
86002520,3sleep10-21swapper/109:00:481
254162470,3sleep125420-21timerandwakeup09:45:461
31180994616,28cyclictest0-21swapper/007:55:400
31180994616,28cyclictest0-21swapper/007:55:400
31180994613,11cyclictest0-21swapper/009:40:390
132172460,3sleep20-21swapper/210:40:432
132172460,3sleep20-21swapper/210:40:432
68362450,7chrt6840-21tail08:55:491
68362450,7chrt6840-21tail08:55:491
6042430,2sleep20-21swapper/208:40:432
6042430,2sleep20-21swapper/208:40:432
229382410,3sleep023148-21unixbench_singl11:05:510
229382410,3sleep023148-21unixbench_singl11:05:510
244202400,3sleep30-21swapper/311:10:433
147822390,2sleep114787-21sh09:20:271
147822390,2sleep114787-21sh09:20:271
152182370,3sleep20-21swapper/209:20:392
46922360,2chrt0-21swapper/008:50:460
46922360,2chrt0-21swapper/008:50:460
31181993629,5cyclictest2393-21systemctl11:40:271
31181993629,5cyclictest2393-21systemctl11:40:271
31181993629,5cyclictest2393-21systemctl11:40:271
136082360,2sleep013629-21latency_hist07:50:320
136082360,2sleep013629-21latency_hist07:50:320
83802350,3sleep30-21swapper/307:35:393
83802350,3sleep30-21swapper/307:35:393
31180993529,5cyclictest17907-21threads09:25:500
31180993529,5cyclictest17907-21threads09:25:500
31181993424,3cyclictest181rcu_preempt12:32:591
31181993327,4cyclictest29740-21latency_hist10:00:261
31181993327,4cyclictest29740-21latency_hist10:00:261
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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