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2025-09-16 - 20:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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: 100 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 rackeslot4s.osadl.org (updated Tue Sep 16, 2025 12:44:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3966228994340,2cyclictest113436-21fwupd12:36:561
3966228993734,2cyclictest4017929-21kworker/u8:0+events_unbound08:35:201
3966225993528,4cyclictest103328-21latency_hist12:30:010
3966233993226,4cyclictest4012510-21latency_hist07:55:012
3966225993228,3cyclictest14996-21kworker/u8:0+flush-259:012:35:180
3966233993126,3cyclictest83046-21/usr/sbin/munin12:10:242
3966236992925,3cyclictest3981569-21apt-get07:24:313
3966233992924,3cyclictest2698871-21systemd-journal09:28:312
3966236992825,2cyclictest4017929-21kworker/u8:0+flush-259:009:05:003
3966233992824,3cyclictest103569-21/usr/sbin/munin12:30:162
3966228992824,3cyclictest4178266-21kworker/u8:1+flush-259:011:05:161
3966233992721,4cyclictest4007396-21latency_hist07:50:012
3966228992721,4cyclictest4002258-21latency_hist07:45:001
3966225992721,4cyclictest2698871-21systemd-journal08:25:220
3966236992623,2cyclictest4178266-21kworker/u8:1+flush-259:011:05:173
3966236992620,4cyclictest3997146-21latency_hist07:40:013
3966233992621,4cyclictest14965-21latency_hist11:05:002
3966228992623,2cyclictest4146746-21kworker/u8:0+events_unbound10:30:181
3966228992622,2cyclictest72759-21kworker/u8:1+flush-259:012:25:161
3966225992623,2cyclictest4178266-21kworker/u8:1+flush-259:010:45:180
3966236992520,4cyclictest41904-21/usr/sbin/munin11:30:193
3966228992522,2cyclictest3971516-21kworker/u8:0+flush-259:007:20:261
3966228992521,3cyclictest83071-21apt-get12:10:131
3966228992521,3cyclictest4017929-21kworker/u8:0+events_unbound09:36:301
3966228992519,5cyclictest2698871-21systemd-journal08:30:011
3966225992519,4cyclictest51068-21ntpq11:35:210
3966236992420,3cyclictest4017929-21kworker/u8:0+flush-259:008:05:173
3966228992421,2cyclictest4188522-21kworker/u8:4+flush-259:011:20:151
3966228992420,3cyclictest4178266-21kworker/u8:1+events_unbound10:50:191
3966236992320,2cyclictest3002-21cron10:45:013
3966233992319,3cyclictest3981637-21kworker/u8:4+events_unbound07:35:152
3966233992319,3cyclictest36756-21apt-get11:25:122
3966228992319,2cyclictest14996-21kworker/u8:0+flush-259:011:10:181
3966225992320,1cyclictest1-21systemd09:28:310
3966236992217,4cyclictest3951063-21kworker/u8:3+flush-259:007:45:203
3966236992217,3cyclictest72759-21kworker/u8:1+events_unbound12:25:003
3966236992216,4cyclictest2698871-21systemd-journal09:50:003
3966233992219,2cyclictest4100456-21kworker/u8:4+flush-259:009:25:002
3966228992219,2cyclictest4183195-21systemd-run10:40:011
3966228992218,3cyclictest4017929-21kworker/u8:0+flush-259:008:45:191
3966225992218,3cyclictest2698871-21systemd-journal11:05:000
3966225992217,3cyclictest41547-40mandb11:28:510
3966236992117,3cyclictest4146746-21kworker/u8:0+flush-259:010:35:213
3966233992117,3cyclictest36059-21apt-get11:25:012
3966233992116,4cyclictest4068279-21ntpq08:45:232
3966228992118,2cyclictest4058890-21kworker/u8:2+events_unbound08:55:191
3966228992117,3cyclictest4188522-21kworker/u8:4+events_unbound11:54:541
3966228992117,3cyclictest4178266-21kworker/u8:1+flush-259:011:30:001
3966228992117,3cyclictest4146746-21kworker/u8:0+flush-259:010:40:231
3966228992117,3cyclictest4012535-21kworker/u8:1+events_unbound08:30:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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