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2026-09-21 - 17:36

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Mon Sep 21, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2003822130,3sleep020039-21forks07:55:160
1055221600,3sleep010553-21latency_hist11:30:010
481321460,2sleep04811-21grep09:00:250
2247721400,2sleep022476-21sed08:05:000
1768921260,4chrt17687-21ntp_states07:45:240
1125021210,4chrt11251-21/usr/sbin/munin09:25:270
2766821190,4chrt27669-21awk12:35:250
1394521160,2sleep013946-21basename07:30:250
2361721140,4chrt23540-21latency_hist10:15:010
1822321000,4sleep018278-21cut12:00:030
109582990,2sleep010959-21egrep07:20:130
185592980,3sleep018577-21fw_packets09:55:140
75282970,3sleep07052-21/usr/sbin/munin07:05:270
107782960,3sleep010823-21netstat11:30:190
134032950,5sleep013451-21latency_hist07:30:010
289752900,3sleep028829-21/usr/sbin/munin10:35:180
70772864,9sleep07133-21/usr/sbin/munin09:10:200
27302845,8sleep02822-21modprobe11:00:030
33032830,3sleep03355-21processes08:55:250
96482790,2sleep09649-21sort09:20:160
148332796,59sleep014837-21memory09:40:170
123712790,3sleep012410-21processes09:30:250
159402765,59sleep015985-21df09:45:120
316852700,3sleep031686-21ntpq10:45:210
263322673,5sleep00-21swapper12:30:200
8249996524,14cyclictest27164-21sshd08:21:260
8249996126,24cyclictest946-21ntpd08:15:200
8249996034,17cyclictest5748-21/usr/sbin/munin11:10:270
8249996011,17cyclictest20217-21/usr/sbin/munin10:00:260
824999598,23cyclictest30330-21memory10:40:170
824999598,20cyclictest22194-21/usr/sbin/munin12:15:280
8249995934,15cyclictest9890-21/usr/sbin/munin07:15:190
8249995921,26cyclictest22808-21/usr/sbin/munin08:05:200
8249995910,15cyclictest14511-21munin-run09:40:010
824999588,18cyclictest24791-21/usr/sbin/munin12:25:160
824999587,17cyclictest23650-21seq10:15:060
8249995836,15cyclictest30891-21/usr/sbin/munin08:35:310
8249995835,15cyclictest2586-21runrttasks08:52:450
8249995824,24cyclictest21357-21/usr/sbin/munin12:10:270
8249995823,12cyclictest19831-21cron07:55:000
8249995810,16cyclictest15680-21latency_hist11:50:020
824999576,18cyclictest417-21/usr/sbin/munin08:45:140
824999576,17cyclictest16108-21/usr/sbin/munin07:40:170
8249995734,15cyclictest8948-21/usr/sbin/munin07:10:310
8249995734,15cyclictest1800-21/usr/sbin/munin10:55:210
8249995733,16cyclictest27993-21/usr/sbin/munin10:30:270
8249995731,16cyclictest5874-21/usr/sbin/munin09:05:230
8249995717,16cyclictest89202chrt11:22:550
8249995713,14cyclictest276-21runrttasks11:50:150
8249995712,18cyclictest8814-21sshd09:15:470
8249995710,15cyclictest25236-21/usr/sbin/munin10:20:210
3052570,3sleep0332-21idleruntime10:50:160
824999569,16cyclictest31606-21/usr/sbin/munin08:40:180
824999569,15cyclictest11876-21/usr/sbin/munin11:35:330
824999568,16cyclictest17211-21/usr/sbin/munin09:50:270
8249995633,15cyclictest27294-21runrttasks10:29:010
8249995631,15cyclictest15348-21/usr/sbin/munin07:35:270
824999559,18cyclictest288-21snmpd12:08:370
824999559,16cyclictest13855-21seq11:41:030
824999558,17cyclictest18695-21sshd12:00:250
824999557,16cyclictest21097-21/usr/sbin/munin10:05:200
8249995533,15cyclictest27973-21/usr/sbin/munin08:25:190
8249995532,14cyclictest29930-21runrttasks08:33:070
8249995530,17cyclictest4543-21/usr/sbin/munin11:05:250
824999547,15cyclictest23842-21/usr/sbin/munin08:10:130
824999547,14cyclictest6697-21/usr/sbin/munin11:15:110
8249995431,15cyclictest23797-21runrttasks12:20:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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