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2025-11-16 - 16:00

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 Sun Nov 16, 2025 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1419322740,3sleep014192-21users11:10:300
729622470,2sleep07298-21wc10:45:180
2178321080,4sleep021842-21mailstats11:40:290
2945321020,5sleep029456-21df_inode08:00:170
1095621010,3sleep010957-21cut11:00:020
894621000,4sleep09015-21/usr/sbin/munin10:50:310
26132960,4sleep02682-21/usr/sbin/munin08:20:290
61142950,3sleep06118-21/usr/sbin/munin08:35:190
22982950,3sleep02354-21processes10:25:270
10892950,4sleep01110-21open_inodes08:15:250
167722920,2sleep016773-21systemctl09:15:270
321942890,3sleep032266-21mailstats10:15:290
232262880,3sleep023228-21awk09:40:270
219322870,3sleep021960-21/usr/sbin/munin07:30:270
113212870,3sleep011325-21ntpq11:00:260
252952840,4sleep025333-21if_err_eth011:55:160
1540328020,32sleep015432-21/usr/sbin/munin07:05:190
123312754,60sleep012413-21sort09:00:010
73602710,3sleep07358-21forks08:40:170
16351996330,22cyclictest5992-21/usr/sbin/munin10:40:160
16351996135,17cyclictest23871-21latency_hist11:50:010
16351996135,15cyclictest17753-21/usr/sbin/munin09:20:170
1635199608,16cyclictest20212-21/usr/sbin/munin09:30:310
16351996036,15cyclictest19014-21/usr/sbin/munin09:25:180
1635199599,17cyclictest31777-21df_inode12:20:140
1635199599,17cyclictest22922-21/usr/sbin/munin07:35:310
16351995921,14cyclictest27953-21cron07:55:010
16351995918,15cyclictest18917-21sendmail07:20:010
16351995911,18cyclictest12909-21users11:05:310
1635199589,17cyclictest21497-21/usr/sbin/munin09:35:150
1635199589,16cyclictest8703-21/usr/sbin/munin08:45:170
1635199589,15cyclictest24098-21/usr/sbin/munin09:45:140
1635199588,18cyclictest31215-21grep08:05:320
1635199588,18cyclictest12445-21/usr/sbin/munin09:00:220
1635199588,16cyclictest4549-21/usr/sbin/munin10:35:260
1635199587,17cyclictest18659-21munin-run11:30:010
16351995834,16cyclictest24275-21/usr/sbin/munin11:50:250
16351995828,18cyclictest11008-21latency_hist08:55:020
16351995811,13cyclictest16502-21df07:10:110
1635199579,18cyclictest28223-21/usr/sbin/munin10:00:220
1635199579,17cyclictest29269-21/usr/sbin/munin10:05:300
1635199579,17cyclictest16499-21ntp_states11:20:250
1635199579,16cyclictest26540-21/usr/sbin/munin12:00:290
1635199579,16cyclictest25380-21/usr/sbin/munin09:50:290
1635199579,15cyclictest3405-21chrt08:25:130
1635199579,15cyclictest13741-21/usr/sbin/munin09:05:280
1635199579,14cyclictest25804-21ntp_states07:45:230
1635199579,13cyclictest191492sleep007:20:160
1635199578,16cyclictest20207-21irqstats11:35:180
1635199578,16cyclictest15031-21/usr/sbin/munin09:10:160
16351995731,17cyclictest3984-21runrttasks10:31:250
16351995731,15cyclictest28089-21/usr/sbin/munin12:05:220
16351995730,17cyclictest20421-21/usr/sbin/munin07:25:150
16351995728,18cyclictest31581-21munin-run12:20:010
16351995723,22cyclictest0-21swapper12:35:420
1635199569,17cyclictest31970-21/usr/sbin/munin08:10:210
1635199569,16cyclictest30541-21sshd10:10:080
1635199569,14cyclictest28376-21ntpq07:55:240
1635199568,17cyclictest29118-21/usr/sbin/munin12:10:220
1635199568,16cyclictest14884-21/usr/sbin/munin11:15:250
1635199567,16cyclictest1828-21/usr/sbin/munin12:30:180
16351995631,16cyclictest24379-21/usr/sbin/munin07:40:200
16351995610,16cyclictest604-21df12:25:160
1635199559,20cyclictest19939-21latency_hist11:35:020
1635199558,15cyclictest26665-21/usr/sbin/munin09:55:170
1635199549,16cyclictest4737-21/usr/sbin/munin08:30:140
1635199548,16cyclictest1916-21latency_hist10:25:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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