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2026-05-22 - 20:23

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 Fri May 22, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1480822580,3sleep014810-21timerandwakeup08:50:280
126321330,4chrt1261-21df_inode10:05:120
1066921290,3chrt10668-21/usr/sbin/munin08:35:210
1865921220,3chrt18657-21wc09:05:260
2753821200,3chrt27540-21open_inodes09:40:230
1976521160,4chrt19762-21cat11:15:270
2112721090,3chrt21129-21processes09:15:240
1715121010,4sleep017149-21ntp_states09:00:220
2519021000,2sleep025192-21uname07:25:220
325152990,3sleep032526-21ntp_states12:05:210
181712980,4sleep018233-21ntp_kernel_err11:10:180
262022960,3sleep026221-21open_inodes09:35:250
101522900,4sleep010153-21sshd08:34:070
222682840,3sleep022317-21/usr/sbin/munin09:20:190
215152785,61sleep021509-21apt-get11:23:030
287952770,5sleep028825-21/usr/sbin/munin09:45:240
20412770,2sleep02043-21kworker/u2:308:01:000
2015327721,30sleep020202-21users07:05:260
178672680,3sleep017868-21latency_hist11:10:020
20815996736,21cyclictest6637-21/usr/sbin/munin10:25:180
263602650,2sleep026362-21timerwakeupswit11:40:280
2081599638,15cyclictest7151-21sshd12:33:080
20815996312,21cyclictest22206-21ntp_states11:25:220
20815996215,16cyclictest10532-21ntp_states10:40:220
20815996112,17cyclictest24837-21/usr/sbin/munin11:35:260
2081599609,20cyclictest28357-21/usr/sbin/munin11:50:300
2081599609,17cyclictest27624-21tr07:35:210
20815996035,16cyclictest15618-21/usr/sbin/munin08:55:120
20815996027,23cyclictest30444-21runrttasks09:50:570
2081599599,15cyclictest4158-21/usr/sbin/munin08:10:190
2081599598,18cyclictest30809-21munin-run12:00:010
20815995910,16cyclictest30205-21/usr/sbin/munin07:45:200
2081599589,19cyclictest5501-21ntpq08:15:200
2081599589,17cyclictest28674-21/usr/sbin/munin07:40:140
2081599589,16cyclictest6550-21/usr/sbin/munin08:20:250
2081599588,17cyclictest1-21systemd10:40:000
2081599588,16cyclictest26330-21chrt07:30:190
20815995835,14cyclictest20990-21/usr/sbin/munin07:10:150
20815995833,16cyclictest11888-21/usr/sbin/munin08:40:180
20815995833,15cyclictest32510-21/usr/sbin/munin10:00:140
2081599579,18cyclictest19587-21irqstats09:10:160
2081599578,16cyclictest13048-21df_inode08:45:120
20815995733,16cyclictest14241-21/usr/sbin/munin10:55:150
20815995733,15cyclictest4409-21runrttasks12:21:380
20815995732,16cyclictest7977-21/usr/sbin/munin08:25:170
20815995732,16cyclictest31255-21/usr/sbin/munin09:55:180
20815995721,12cyclictest276-21runrttasks12:25:240
20815995716,12cyclictest0-21swapper09:25:220
20815995710,18cyclictest7938-21ntp_states10:30:210
2081599569,15cyclictest24894-21ntpq09:30:190
2081599568,16cyclictest11531-21/usr/sbin/munin10:45:230
20815995633,14cyclictest3078-21/usr/sbin/munin08:05:280
20815995633,14cyclictest2427-21/usr/sbin/munin12:15:140
20815995631,16cyclictest22332-21/usr/sbin/munin07:15:160
20815995631,16cyclictest1339-21latency_hist08:00:020
20815995628,17cyclictest2884-21/usr/sbin/munin10:10:240
2081599559,14cyclictest27126-21/usr/sbin/munin11:45:110
2081599558,16cyclictest1061-21/usr/sbin/munin12:10:130
2081599558,15cyclictest3772-21/usr/sbin/munin10:15:200
2081599557,15cyclictest5090-21/usr/sbin/munin10:20:200
20815995533,14cyclictest23624-21/usr/sbin/munin07:20:140
20815995532,16cyclictest13582-21runrttasks10:51:510
20815995532,15cyclictest32226-21runrttasks07:53:390
2081599549,14cyclictest15457-21df11:00:130
2081599547,16cyclictest7513-21/usr/sbin/munin12:35:200
20815995432,14cyclictest31225-21/usr/sbin/munin12:00:210
20815995330,15cyclictest23250-21/usr/sbin/munin11:30:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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