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2026-08-08 - 19:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 792 highest latencies:
System rack4slot6s.osadl.org (updated Sat Aug 08, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2516522540,3sleep025166-21modprobe08:10:010
2914221880,4chrt29141-21/usr/sbin/munin12:35:220
1535121620,3sleep015350-21cat09:35:280
64121300,3chrt642-21/usr/sbin/munin08:40:120
1473721230,3chrt14735-21df_inode11:40:130
2390621160,2sleep023908-21missed_timers12:15:220
2006521140,3chrt20063-21wc07:50:020
2155821100,4chrt21559-21/usr/sbin/munin10:00:190
3038721080,4chrt30388-21awk10:35:130
72082940,3sleep07206-21ntp_states11:10:250
203472910,2sleep020344-21cat07:50:180
33482870,3sleep03352-21memory08:50:190
47342825,8sleep04738-21ntpq08:55:230
186722816,62sleep018674-21irqstats11:55:190
270522796,60sleep027110-21ls08:15:290
269652720,2sleep026966-21/usr/sbin/munin10:20:280
9707997126,15cyclictest21416-21/usr/sbin/munin07:55:230
105932713,6sleep00-21swapper09:18:260
849927017,29sleep08549-21df07:05:070
970799639,27cyclictest3178-21irqstats10:55:190
970799609,18cyclictest20289-21ntpq09:55:210
9707996034,16cyclictest9920-21/usr/sbin/munin11:20:270
970799599,16cyclictest17247-21/usr/sbin/munin11:50:250
9707995934,17cyclictest11339-21/usr/sbin/munin07:15:200
9707995911,16cyclictest31643-21/usr/sbin/munin10:40:240
970799588,15cyclictest1882-21/usr/sbin/munin08:45:190
9707995834,15cyclictest25250-21/usr/sbin/munin10:15:170
9707995834,15cyclictest10059-21/usr/sbin/munin07:10:200
9707995819,14cyclictest173892chrt07:39:530
9707995810,17cyclictest15379-21find07:30:260
9707995810,13cyclictest22704-21ntp_states12:10:240
970799579,16cyclictest26300-21egrep12:25:130
970799578,18cyclictest18718-21/usr/sbin/munin09:50:170
970799577,18cyclictest17387-21/usr/sbin/munin09:45:240
970799577,15cyclictest162342sleep011:45:210
9707995735,15cyclictest8620-21/usr/sbin/munin09:10:210
9707995733,16cyclictest31193-21runrttasks08:31:300
9707995733,15cyclictest13858-21/usr/sbin/munin07:25:170
9707995732,16cyclictest14051-21runrttasks11:36:070
9707995730,17cyclictest28467-21runrttasks10:26:140
9707995722,26cyclictest29202-21latency10:30:180
9707995711,17cyclictest12414-21/usr/sbin/munin07:20:250
9707995711,15cyclictest16515-21/usr/sbin/munin09:40:260
970799569,17cyclictest31998-21/usr/sbin/munin08:35:200
970799569,16cyclictest21002-21latency_hist12:04:590
970799569,15cyclictest23884-21/usr/sbin/munin10:10:270
970799568,18cyclictest5678-21/usr/sbin/munin11:05:120
970799568,15cyclictest21129-21/usr/sbin/munin12:05:210
970799568,15cyclictest12089-21/usr/sbin/munin11:30:140
970799568,14cyclictest29185-21/usr/sbin/munin08:25:270
970799567,15cyclictest1749-21/usr/sbin/munin10:50:150
9707995633,16cyclictest17631-21/usr/sbin/munin07:40:140
9707995633,14cyclictest4607-21/usr/sbin/munin11:00:210
9707995631,16cyclictest8976-21runrttasks11:16:550
9707995631,16cyclictest25302-21/usr/sbin/munin08:10:120
9707995631,16cyclictest22810-21/usr/sbin/munin08:00:150
9707995630,17cyclictest6365-21runrttasks09:00:310
9707995630,17cyclictest29008-21runrttasks08:24:400
9707995610,18cyclictest13379-21cron09:30:010
970799559,15cyclictest11425-21sshd11:25:370
970799559,13cyclictest25015-21/usr/sbin/munin12:20:310
970799558,14cyclictest747-21ntp_states10:45:250
9707995532,14cyclictest7130-21/usr/sbin/munin09:05:160
9707995510,31cyclictest11208-21ntpq09:20:200
970799549,15cyclictest27866-21chrt12:30:230
970799548,16cyclictest13514-21/usr/sbin/munin09:30:280
970799537,14cyclictest22604-21/usr/sbin/munin10:05:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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