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2026-08-11 - 22:54

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 Aug 11, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2599622500,3sleep025998-21sh08:30:000
456722390,3sleep04571-21timerwakeupswit09:10:280
573021630,2sleep05731-21/usr/sbin/munin07:10:200
1340521530,4chrt12855-21/usr/sbin/munin11:50:260
200421350,2sleep02002-21uptime09:00:290
2746121290,4chrt27459-21df08:35:120
1449421270,3chrt14330-21/usr/sbin/munin09:50:180
1225421230,3chrt12253-21sed09:40:250
2345621170,4chrt23455-21sort08:20:010
3023421160,3chrt30233-21/usr/sbin/munin10:50:270
807921080,4sleep08137-21ntp_kernel_err09:25:190
1668321020,2sleep016685-21latency_hist12:05:020
2118721000,2sleep021186-21wc10:15:260
65662990,4sleep06420-21/usr/sbin/munin11:25:200
58742930,2sleep05875-21awk09:15:280
256662930,4sleep025690-21cat12:40:000
66632926,10sleep06667-21df_inode09:20:140
324282906,9sleep032465-21latency_hist08:55:010
314072900,3sleep031453-21proc_pri10:55:260
287792900,4sleep028803-21idleruntime08:40:140
286052890,4sleep028622-21/usr/sbin/munin10:45:150
156732870,4sleep015759-21sed07:50:020
421527821,33sleep04220-21df_inode07:05:110
204352746,57sleep0288-21snmpd12:19:220
150592744,6sleep00-21swapper11:58:060
251442650,3sleep025217-21cat10:30:290
5360996324,12cyclictest26239-21ntp_states10:35:240
5360996220,17cyclictest104362chrt11:40:160
5360996137,16cyclictest8216-21/usr/sbin/munin11:30:270
5360996137,16cyclictest26530-21/usr/sbin/munin08:30:250
5360996132,20cyclictest13376-21/usr/sbin/munin09:45:270
5360996129,23cyclictest24498-21latency_hist12:35:020
5360996123,13cyclictest7475-21sshd07:16:320
536099609,19cyclictest16755-21/usr/sbin/munin12:05:320
536099609,17cyclictest30259-21ntpq08:45:200
5360996035,16cyclictest12183-21/usr/sbin/munin11:45:300
5360996011,14cyclictest18082-21df12:10:140
536099597,23cyclictest24176-21sshd08:20:350
5360995916,15cyclictest27368-21/usr/sbin/munin10:40:150
536099589,16cyclictest15615-21/usr/sbin/munin09:55:270
536099589,14cyclictest32476-21/usr/sbin/munin11:00:140
5360995834,16cyclictest16379-21/usr/sbin/munin07:50:290
536099579,15cyclictest2702-21/usr/sbin/munin09:05:260
536099579,15cyclictest23382-21/usr/sbin/munin10:25:210
536099579,15cyclictest18206-21/usr/sbin/munin10:05:160
536099578,18cyclictest17369-21awk10:00:280
5360995734,15cyclictest20924-21/usr/sbin/munin12:20:200
5360995733,15cyclictest1724-21/usr/sbin/munin11:05:270
5360995733,15cyclictest10123-21runrttasks11:39:560
5360995717,13cyclictest22494-21timerandwakeup12:25:280
536099569,15cyclictest13217-21/usr/sbin/munin07:40:160
536099568,17cyclictest19672-21/usr/sbin/munin08:05:170
536099568,15cyclictest19497-21/usr/sbin/munin10:10:130
536099567,15cyclictest9171-21/usr/sbin/munin09:30:170
536099566,17cyclictest22725-21seq10:20:390
5360995632,16cyclictest5487-21/usr/sbin/munin11:20:240
5360995632,15cyclictest11991-21/usr/sbin/munin07:35:140
5360995631,16cyclictest18526-21/usr/sbin/munin08:00:170
5360995610,18cyclictest4993-21munin-run11:20:010
536099559,13cyclictest8210-21irqstats07:20:170
536099558,17cyclictest2529-21/usr/sbin/munin11:10:270
536099558,14cyclictest300-21ls08:55:200
536099557,13cyclictest9940-21users07:25:290
536099556,18cyclictest10458-21/usr/sbin/munin09:35:180
5360995510,30cyclictest17138-21df_inode07:55:150
536099549,13cyclictest21007-21df08:10:120
5360995411,15cyclictest11490-21seq07:32:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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