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2026-05-19 - 02:07

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 Tue May 19, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3175421530,3sleep031755-21modprobe22:40:010
1914621210,3chrt19144-21memory21:50:170
1007421150,2sleep010075-21modprobe19:10:020
1353621120,3chrt13537-21latency_hist23:35:020
2569721110,4chrt25698-21if_err_eth020:10:160
767521100,4sleep07162-21/usr/sbin/munin23:10:290
3217921040,4sleep032182-21uname20:35:180
2531621020,4sleep025320-21df_inode00:20:140
2471721020,4sleep024719-21users22:10:290
592521000,2chrt5926-21lockfile-create21:00:010
86382970,4sleep08697-21ntpq23:15:210
217702950,3sleep021771-21grep22:00:200
192802890,3sleep019289-21latency19:45:180
295922820,3sleep029616-21open_inodes22:30:240
155562810,3sleep015591-21proc_pri19:30:250
121972785,62sleep012204-21kworker/u2:023:30:000
282902764,59sleep028323-21irqstats20:20:130
995827419,33sleep09968-21/usr/sbin/munin19:10:020
12622710,3sleep01264-21timerwakeupswit22:45:290
173892670,2sleep017385-21latency_hist23:50:010
139292650,3sleep013930-21awk23:35:220
999599599,19cyclictest2438-21ntpq20:45:210
9995995934,16cyclictest27222-21/usr/sbin/munin20:15:230
9995995934,16cyclictest14268-21/usr/sbin/munin19:25:220
9995995928,21cyclictest24740-21/usr/sbin/munin20:05:250
9995995910,17cyclictest27051-21/usr/sbin/munin00:25:240
9995995910,15cyclictest25412-21/usr/sbin/munin22:15:330
999599589,15cyclictest1399-21grep20:40:270
999599588,20cyclictest20419-21/usr/sbin/munin19:50:280
999599588,17cyclictest3279-21/usr/sbin/munin22:55:180
999599588,17cyclictest1992-21/usr/sbin/munin22:50:270
9995995832,16cyclictest4133-21runrttasks20:51:070
9995995831,16cyclictest17672-21runrttasks19:39:520
9995995827,22cyclictest19166-21sendmail_mailqu23:55:230
999599579,17cyclictest28339-21grep00:30:270
999599579,17cyclictest28064-21df22:25:120
999599579,17cyclictest11234-21/usr/sbin/munin21:20:180
999599577,16cyclictest16391-21/usr/sbin/munin21:40:140
999599577,16cyclictest13798-21/usr/sbin/munin21:30:250
999599577,15cyclictest26728-21/usr/sbin/munin22:20:250
9995995732,16cyclictest21816-21/usr/sbin/munin00:05:270
9995995731,17cyclictest9980-21/usr/sbin/munin21:15:150
999599569,14cyclictest21705-21/usr/sbin/munin19:55:160
999599568,16cyclictest25123-21awk00:20:000
999599568,14cyclictest8626-21/usr/sbin/munin21:10:140
999599568,14cyclictest6003-21if_eth023:05:140
999599568,14cyclictest23010-21/usr/sbin/munin20:00:140
999599568,14cyclictest20088-21/usr/sbin/munin00:00:160
9995995634,15cyclictest9958-21/usr/sbin/munin23:20:200
9995995630,15cyclictest11643-21/usr/sbin/munin19:15:220
9995995613,15cyclictest6831-21sshd21:01:560
9995995612,15cyclictest4753-21/usr/sbin/munin23:00:180
999599559,16cyclictest17778-21ntp_states23:50:220
999599558,16cyclictest14925-21/usr/sbin/munin23:40:160
999599558,15cyclictest29522-21/usr/sbin/munin20:25:110
999599557,19cyclictest18270-21run-parts19:40:280
999599557,15cyclictest187062chrt21:49:000
9995995532,16cyclictest23400-21runrttasks00:11:370
9995995529,18cyclictest16361-21latency_hist21:40:020
9995995528,16cyclictest23030-21/usr/sbin/munin22:05:170
9995995510,18cyclictest32169-21ntp_states22:40:200
999599547,17cyclictest20241-21/usr/sbin/munin21:55:230
9995995430,16cyclictest7390-21runrttasks21:05:130
9995995429,16cyclictest13423-21runrttasks21:27:570
9995995410,18cyclictest29405-21ntpq00:35:230
999599538,17cyclictest12693-21/usr/sbin/munin19:20:130
9995995310,18cyclictest31044-21ntp_states20:30:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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