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2026-04-21 - 01:09

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 all highest latencies:
System rack4slot6s.osadl.org (updated Mon Apr 20, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
387622460,3sleep03877-21cat12:30:290
2184522390,2sleep021842-21grep07:25:030
1122821480,2sleep011229-21ls08:49:590
108421270,4chrt1087-21proc_pri12:20:240
1781121220,4chrt17664-21/usr/sbin/munin11:20:160
3208221190,4chrt32080-21df10:10:120
3051321170,4chrt30511-21sshd10:04:120
367121160,4chrt3670-21grep08:20:100
191502990,3sleep019189-21cat07:15:020
258532980,4sleep025911-21/usr/sbin/munin11:50:270
215832920,4sleep021623-21latency_hist09:30:010
215742886,67sleep021578-21df_inode11:35:140
87862827,64sleep08838-21df08:40:120
323502810,3sleep032425-21sed12:15:280
1689727520,32sleep016954-21/usr/sbin/munin07:05:180
22252720,2sleep02224-21df10:20:120
17192633,5sleep00-21swapper10:17:360
1789199617,20cyclictest30560-21/usr/sbin/munin12:10:290
17891996110,18cyclictest28242-21ntpq12:00:200
17891996022,15cyclictest4360-21runrttasks10:28:000
17891996020,12cyclictest0-21swapper08:30:280
17891996012,14cyclictest25613-21munin-run07:40:000
17891996010,17cyclictest29601-21/usr/sbin/munin07:55:280
1789199599,16cyclictest26678-21/usr/sbin/munin11:55:140
1789199598,18cyclictest30911-21/usr/sbin/munin08:00:260
1789199598,18cyclictest22987-21/usr/sbin/munin09:35:280
1789199598,16cyclictest2029-21/usr/sbin/munin12:25:190
1789199598,15cyclictest11350-21/usr/sbin/munin08:50:320
1789199597,18cyclictest21702-21/usr/sbin/munin09:30:260
17891995935,15cyclictest2500-21/usr/sbin/munin08:15:190
17891995935,15cyclictest15541-21/usr/sbin/munin11:10:270
17891995911,14cyclictest25875-21ntp_states09:45:260
1789199589,17cyclictest26370-21seq07:40:340
1789199589,16cyclictest21876-21/usr/sbin/munin07:25:120
1789199588,19cyclictest12483-21/usr/sbin/munin11:00:240
1789199588,16cyclictest27036-21/usr/sbin/munin07:45:190
17891995835,15cyclictest6535-21/usr/sbin/munin10:35:290
17891995833,17cyclictest24199-21runrttasks11:45:150
17891995833,16cyclictest27449-21/usr/sbin/munin09:50:290
17891995832,16cyclictest14223-21/usr/sbin/munin11:05:260
17891995819,14cyclictest19478-21ls11:25:270
17891995818,13cyclictest13822-21tr09:00:010
17891995811,15cyclictest8649-21awk08:40:000
300982573,9sleep00-21swapper12:07:150
1789199579,15cyclictest5182-21tr08:25:210
1789199577,18cyclictest14128-21chrt09:00:160
17891995733,15cyclictest17096-21/usr/sbin/munin09:10:290
17891995732,15cyclictest28362-21/usr/sbin/munin07:50:110
17891995722,27cyclictest19869-21/usr/sbin/munin07:15:290
17891995710,17cyclictest24322-21munin-run07:35:010
17891995710,14cyclictest18070-21ntpq09:15:200
1789199569,16cyclictest24293-21/usr/sbin/munin09:40:190
1789199569,15cyclictest7329-21/usr/sbin/munin10:40:150
1789199569,15cyclictest5229-21seq12:35:420
1789199567,15cyclictest16345-21/usr/sbin/munin11:15:160
17891995632,17cyclictest16494-21latency_hist09:10:020
17891995610,19cyclictest30799-21df10:05:130
1789199559,18cyclictest5987-21sort10:35:020
1789199558,18cyclictest20067-21sshd09:23:120
1789199558,17cyclictest11177-21/usr/sbin/munin10:55:110
1789199558,16cyclictest22830-21/usr/sbin/munin11:40:130
1789199557,15cyclictest8609-21/usr/sbin/munin10:45:250
17891995531,16cyclictest1023-21munin-node08:10:100
17891995528,17cyclictest21270-21runrttasks11:34:030
1789199548,16cyclictest9894-21/usr/sbin/munin10:50:310
17891995430,16cyclictest769-21runrttasks08:09:040
17891995327,16cyclictest28203-21/usr/sbin/munin09:55:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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