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2026-04-13 - 16:13

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 highest latencies:
System rack4slot6s.osadl.org (updated Mon Apr 13, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
780422480,3sleep07801-21ps11:25:240
2212621220,5chrt22127-21/usr/sbin/munin08:10:150
1395621200,4chrt13954-21df11:50:130
1079921200,4chrt10797-21users09:30:290
346221190,4chrt3461-21latency_hist11:10:010
1410421150,2sleep014107-21modprobe07:40:000
2185921130,3chrt21857-21memory12:20:180
674821120,4sleep06452-21/usr/sbin/munin07:10:240
2328021120,3chrt23272-21cpu08:15:120
2963721110,4sleep029704-21latency_hist08:40:020
2742821100,3sleep027427-21awk10:35:280
2047021090,4chrt20471-21if_eth012:15:160
2671821030,3sleep026685-21latency_hist12:40:020
202342960,3sleep020299-21cat12:15:010
295782947,11sleep029628-21df10:45:130
247612860,2sleep024760-21wc08:20:170
179192865,9sleep017924-21irqstats12:05:160
157392810,3sleep015737-21grep11:55:280
232482770,2chrt23249-21ntp_states12:25:230
566627320,31sleep05734-21users07:05:240
6349996428,14cyclictest16874-21runrttasks07:50:110
6349996425,28cyclictest14350-21/usr/sbin/munin09:45:200
6349996110,19cyclictest8926-21/usr/sbin/munin09:25:250
6349996010,16cyclictest28553-21/usr/sbin/munin10:40:210
634999599,17cyclictest29831-21/usr/sbin/munin08:40:140
634999599,16cyclictest19248-21/usr/sbin/munin10:05:250
634999598,19cyclictest12492-21idleruntime-cro11:45:000
634999598,18cyclictest10021-21/usr/sbin/munin11:35:270
634999598,17cyclictest23133-21/usr/sbin/munin10:20:180
6349995911,16cyclictest18587-21/usr/sbin/munin07:55:280
274122590,3sleep027414-21grep08:30:220
634999588,22cyclictest32146-21/usr/sbin/munin10:55:140
634999588,17cyclictest11619-21/usr/sbin/munin07:30:260
6349995834,14cyclictest21876-21/usr/sbin/munin10:15:140
6349995832,16cyclictest1326-21/usr/sbin/munin08:55:190
6349995831,17cyclictest12090-21/usr/sbin/munin09:35:290
6349995810,17cyclictest15932-21/usr/sbin/munin07:45:250
634999579,17cyclictest5032-21/usr/sbin/munin09:10:280
634999579,16cyclictest25871-21/usr/sbin/munin08:25:170
634999579,15cyclictest4084-21timerandwakeup11:10:280
634999578,15cyclictest26217-21/usr/sbin/munin10:30:290
634999578,15cyclictest12664-21df11:45:110
634999578,14cyclictest16647-21/usr/sbin/munin09:55:270
6349995734,15cyclictest7724-21/usr/sbin/munin09:20:150
6349995733,15cyclictest16542-21/usr/sbin/munin12:00:110
6349995731,16cyclictest9550-21/usr/sbin/munin07:20:270
6349995731,16cyclictest24316-21/usr/sbin/munin12:30:150
6349995710,15cyclictest18098-21/usr/sbin/munin10:00:150
634999569,14cyclictest20533-21/usr/sbin/munin10:10:290
634999568,18cyclictest24808-21/usr/sbin/munin10:25:250
634999568,15cyclictest7735-21/usr/sbin/munin07:15:250
634999567,17cyclictest20705-21/usr/sbin/munin08:05:250
634999567,16cyclictest14258-21/usr/sbin/munin07:40:150
6349995633,14cyclictest11463-21runrttasks07:29:510
6349995631,15cyclictest6773-21/usr/sbin/munin11:20:280
634999559,16cyclictest8741-21/usr/sbin/munin11:30:160
634999559,16cyclictest30943-21ls10:50:140
634999558,15cyclictest19414-21/usr/sbin/munin08:00:250
634999557,16cyclictest5243-21/usr/sbin/munin11:15:240
634999556,18cyclictest6717-21awk09:15:260
6349995531,14cyclictest87-21jbd2/mmcblk0p1-09:50:380
6349995510,18cyclictest4913-21munin-run09:10:000
634999548,15cyclictest2447-21/usr/sbin/munin09:00:140
634999548,14cyclictest1387-21/usr/sbin/munin11:00:240
6349995430,15cyclictest31191-21/usr/sbin/munin08:45:150
6349995430,15cyclictest13050-21/usr/sbin/munin09:40:210
6349995429,15cyclictest32402-21/usr/sbin/munin08:50:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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