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2026-04-21 - 20:13

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 Tue Apr 21, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1361522550,2sleep013614-21sort10:05:260
1378522190,3sleep013784-21sort08:00:270
1170621280,4chrt11682-21munin-run10:00:020
928321220,4chrt9282-21/usr/sbin/munin09:50:120
1191121150,4chrt11912-21latency_hist07:55:010
293521140,3sleep02938-21latency09:25:150
596621130,4chrt5967-21which07:30:260
449621080,3sleep04495-21tr07:25:200
57821070,4sleep0591-21ntp_states07:10:210
2494621070,3chrt24947-21df08:45:110
176872950,3sleep017689-21timerwakeupswit08:15:280
170012950,2sleep016999-21grep10:20:110
185902940,3sleep018633-21uname10:25:250
315342920,3sleep031570-21if_err_eth007:05:140
249862925,11sleep025005-21ntp_states10:50:220
127872820,4sleep012821-21latency_hist12:10:010
284642815,65sleep028466-21cron11:05:000
226612770,3sleep022735-21cat10:40:300
70362750,2sleep07034-21ls11:45:270
32668996310,18cyclictest6949-21irqstats07:35:160
32668996223,14cyclictest26548-21timerandwakeup10:55:290
32668996218,16cyclictest313-21ntp_states11:20:210
32668996110,21cyclictest13202-21ntpq12:10:210
3266899608,18cyclictest7757-21/usr/sbin/munin11:50:310
32668996014,15cyclictest1505-21/usr/sbin/munin11:25:190
32668996010,17cyclictest15799-21grep12:20:220
3266899598,14cyclictest20845-21/usr/sbin/munin10:35:280
32668995935,14cyclictest7261-21/usr/sbin/munin09:40:280
32668995934,16cyclictest4360-21/usr/sbin/munin11:35:280
32668995921,12cyclictest32503-21kworker/u2:209:25:000
32668995910,15cyclictest31351-21/usr/sbin/munin09:10:310
3266899589,16cyclictest5347-21/usr/sbin/munin09:35:200
32668995835,15cyclictest21307-21/usr/sbin/munin08:30:220
32668995835,14cyclictest4329-21/usr/sbin/munin09:30:190
32668995832,16cyclictest3352-21/usr/sbin/munin07:20:260
32668995831,17cyclictest19333-21runrttasks08:22:470
32668995819,28cyclictest30306-21/usr/sbin/munin09:05:190
32668995810,17cyclictest23692-21/usr/sbin/munin08:40:150
3266899579,17cyclictest22636-21seq08:35:250
3266899579,15cyclictest15265-21sshd08:06:160
3266899578,18cyclictest17003-21chrt12:25:190
3266899578,16cyclictest23434-21/usr/sbin/munin10:45:240
32668995734,16cyclictest8055-21runrttasks09:45:160
32668995732,15cyclictest10442-21/usr/sbin/munin12:00:130
32668995731,16cyclictest19868-21/usr/sbin/munin08:25:170
32668995711,15cyclictest8371-21/usr/sbin/munin07:40:210
32668995710,17cyclictest32323-21cron11:20:010
32668995710,16cyclictest9332-21ntpq11:55:260
3266899569,18cyclictest14352-21sshd12:15:160
3266899569,17cyclictest11816-21/usr/sbin/munin10:00:240
3266899569,14cyclictest5194-21egrep11:40:110
3266899568,16cyclictest2598-21/usr/sbin/munin11:30:230
3266899568,16cyclictest19559-21/usr/sbin/munin10:30:200
3266899568,14cyclictest14390-21/usr/sbin/munin10:10:180
3266899567,16cyclictest9678-21ntpq07:45:210
32668995615,15cyclictest209-21dbus-daemon12:35:280
3266899558,15cyclictest32635-21/usr/sbin/munin09:15:230
3266899557,16cyclictest164752sleep010:17:020
3266899556,13cyclictest30171-21ntp_states11:10:220
32668995531,16cyclictest27990-21/usr/sbin/munin08:55:270
32668995530,15cyclictest12500-21/usr/sbin/munin07:55:270
32668995518,12cyclictest18266-21cat12:30:190
32668995510,17cyclictest28840-21entropy09:00:150
32668995510,17cyclictest16446-21/usr/sbin/munin08:10:290
3266899549,16cyclictest276-21runrttasks11:05:150
3266899547,19cyclictest26725-21timerwakeupswit08:50:270
32668995331,13cyclictest1819-21/usr/sbin/munin07:15:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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