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2026-09-24 - 23:29

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 Thu Sep 24, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1691423230,3sleep016913-21sort10:00:020
424023010,2sleep04238-21sendmail_mailqu11:15:220
3124822530,2sleep031250-21latency_hist08:50:020
1948522500,3sleep019481-21latency_hist10:10:010
2901422110,3sleep029012-21sendmail_mailtr10:45:250
2152222050,3sleep021520-21grep08:10:270
3020721930,2sleep030211-21proc_pri10:50:300
893921480,3sleep08938-21sed11:35:010
2716021280,5chrt27149-21sendmail10:40:020
1854021270,3chrt18515-21awk12:10:310
660221230,4chrt6601-21/usr/sbin/munin11:25:160
543221220,3chrt5428-21ntpq11:20:190
2751221170,4chrt27510-21ls10:40:180
1085721060,4sleep010861-21memory07:30:180
145072950,4sleep014528-21/usr/sbin/munin09:50:170
3632866,67sleep0409-21tr08:55:200
145412830,3sleep014549-21wc07:45:100
471428021,32sleep04787-21users07:05:250
28662794,63sleep02895-21awk11:10:260
223352790,3sleep022347-21entropy08:15:130
202842730,2sleep020286-21sort08:05:260
141972703,5sleep00-21swapper07:43:140
245622684,52sleep024566-21df_inode12:35:120
194212674,52sleep0288-21snmpd08:03:430
5405996520,14cyclictest12006-21/usr/sbin/munin11:45:260
5405996425,13cyclictest31741-21vmstat10:55:310
5405996422,15cyclictest12960-21latency_hist09:45:010
5405996123,14cyclictest595-21/usr/sbin/munin11:00:320
5405996112,18cyclictest25817-21sshd08:28:140
5405996111,18cyclictest9683-21ntp_states07:25:230
540599609,16cyclictest21823-21munin-run12:25:000
5405996011,15cyclictest1979-21timerandwakeup09:00:290
5405995935,15cyclictest23325-21/usr/sbin/munin12:30:180
5405995934,16cyclictest7225-21/usr/sbin/munin07:15:260
5405995934,15cyclictest9127-21/usr/sbin/munin11:35:150
5405995933,17cyclictest4223-21/usr/sbin/munin09:10:160
5405995912,15cyclictest10680-21memory09:35:180
5405995911,18cyclictest18207-21latency_hist10:05:010
540599589,17cyclictest26449-21ntp_states08:30:230
540599589,17cyclictest25003-21ntp_states10:30:270
540599588,16cyclictest15486-21/usr/sbin/munin12:00:140
5405995833,16cyclictest22187-21/usr/sbin/munin12:25:170
5405995822,27cyclictest22718-21runrttasks10:20:280
5405995810,16cyclictest23414-21/usr/sbin/munin10:25:290
5405995810,15cyclictest6642-21/usr/sbin/munin09:20:270
540599579,16cyclictest9209-21/usr/sbin/munin09:30:250
540599579,15cyclictest6497-21sh09:20:000
540599579,14cyclictest19483-21seq12:15:150
540599578,17cyclictest1281-21/usr/sbin/munin11:05:250
540599578,16cyclictest2745-21/usr/sbin/munin09:05:290
540599578,14cyclictest19545-21/usr/sbin/munin10:10:240
5405995735,13cyclictest8187-21/usr/sbin/munin07:20:150
5405995733,16cyclictest27763-21/usr/sbin/munin08:35:240
5405995733,15cyclictest6646-21sshd07:14:580
5405995730,17cyclictest285-21sshd08:40:140
5405995730,16cyclictest31508-21/usr/sbin/munin08:50:160
5405995710,18cyclictest12020-21/usr/sbin/munin07:35:140
5405995710,16cyclictest10473-21sshd11:40:150
540599569,15cyclictest20867-21df10:15:130
540599569,13cyclictest17302-21memory07:55:190
5405995632,14cyclictest15887-21/usr/sbin/munin07:50:120
5405995631,15cyclictest14491-21/usr/sbin/munin11:55:230
540599557,15cyclictest8113-21/usr/sbin/munin09:25:170
5405995532,14cyclictest13146-21/usr/sbin/munin09:45:130
5405995529,16cyclictest16922-21runrttasks12:05:170
5405995512,17cyclictest23817-21sort08:20:190
5405995411,16cyclictest13039-21/usr/sbin/munin11:50:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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