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2025-10-28 - 20:36

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Tue Oct 28, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2175621420,3sleep021758-21sed08:10:270
1376821360,2sleep013767-21processes09:45:260
2634121330,3chrt26340-21sed08:30:010
2097121280,3chrt20972-21latency_hist12:20:010
1751521280,3chrt17517-21latency07:55:190
1009221130,3sleep010095-21cut07:25:270
2784021120,3sleep027841-21/usr/sbin/munin10:40:190
86482880,3sleep08649-21open_files07:20:270
227172880,4sleep022758-21awk10:20:230
281092800,4sleep028162-21mailstats08:35:280
97202790,3sleep09747-21sort09:30:190
444127823,32sleep04491-21df07:05:170
33332730,3sleep03393-21processes09:05:270
5637996638,18cyclictest11067-21/usr/sbin/munin09:35:210
5637996136,16cyclictest31837-21/usr/sbin/munin08:50:210
5637996110,20cyclictest17603-21seq10:00:280
563799609,17cyclictest18674-21/usr/sbin/munin08:00:190
5637996020,13cyclictest29330-21sendmail_mailqu10:45:280
5637996011,14cyclictest12633-21mailstats07:35:280
5637996010,17cyclictest23727-21/usr/sbin/munin12:30:160
5637996010,16cyclictest5809-21memory09:15:210
563799599,18cyclictest1723-21/usr/sbin/munin09:00:170
563799599,16cyclictest3447-21grep11:10:310
563799598,18cyclictest4312-21/usr/sbin/munin09:10:300
563799598,16cyclictest9392-21/usr/sbin/munin11:35:230
5637995933,16cyclictest12394-21/usr/sbin/munin09:40:200
5637995911,18cyclictest13327-21df11:50:140
5637995910,16cyclictest26336-21/usr/sbin/munin10:35:220
5637995910,16cyclictest24825-21sshd08:23:300
563799589,16cyclictest6970-21runrttasks09:20:120
563799589,16cyclictest25055-21/usr/sbin/munin10:30:320
563799589,15cyclictest22339-21/usr/sbin/munin12:25:310
563799588,18cyclictest23770-21/usr/sbin/munin10:25:220
563799587,18cyclictest17166-21/usr/sbin/munin12:05:210
5637995833,15cyclictest31771-21/usr/sbin/munin10:55:230
5637995810,19cyclictest21447-21ntpq10:15:210
5637995810,19cyclictest19189-21users10:05:340
5637995810,16cyclictest1921-21ntpq11:05:210
5637995810,14cyclictest683-21/usr/sbin/munin08:55:220
563799579,18cyclictest16269-21ntp_states09:55:240
563799579,15cyclictest24908-21/usr/sbin/munin12:35:290
563799579,15cyclictest21136-21/usr/sbin/munin12:20:170
563799578,15cyclictest11640-21sshd07:31:300
563799577,17cyclictest9349-21date11:35:020
5637995735,14cyclictest4267-21/usr/sbin/munin11:15:130
5637995733,15cyclictest7148-21/usr/sbin/munin07:15:160
5637995732,17cyclictest14756-21latency_hist07:45:030
5637995732,17cyclictest14618-21df_inode11:55:150
5637995720,14cyclictest19931-21df_inode10:10:130
5637995711,17cyclictest5789-21ntpq11:20:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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