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2026-06-16 - 04:55

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 Jun 16, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1021798994338,4cyclictest1073277-21ntpq19:55:213
1021796994336,5cyclictest1282354-21latency_hist23:20:012
1021796994335,5cyclictest1225594-21latency_hist22:25:012
1021791994235,5cyclictest1220355-21latency_hist22:20:011
1021798994037,2cyclictest1267061-21kworker/u8:2+flush-259:023:15:163
1021798993936,2cyclictest1298213-21kworker/u8:0+flush-259:023:55:213
1021798993936,2cyclictest1142248-21kworker/u8:1+flush-259:021:10:203
1021783993733,3cyclictest1111644-21kworker/u8:0+flush-259:021:25:000
1021798993532,2cyclictest968674-21kworker/u8:4+flush-259:020:10:013
1021798993529,4cyclictest1163487-21latency_hist21:25:003
1021783993530,4cyclictest1111651-21kworker/u8:3+flush-259:020:55:000
1021783993427,5cyclictest1265968-21ntpq23:00:210
1021798993330,2cyclictest1256549-21kworker/u8:1+flush-259:023:20:203
1021796993331,1cyclictest1318617-21fwupd23:52:132
1021796993327,4cyclictest1328813-21ntpq00:00:212
1021796993325,5cyclictest1246229-21latency_hist22:45:012
1021783993325,6cyclictest335557-21systemd-journal21:10:000
1021798993228,3cyclictest1256549-21kworker/u8:1+flush-259:023:30:213
1021798993228,3cyclictest1220590-21kworker/u8:2+flush-259:022:40:253
1021791993228,2cyclictest1335151-21apt-get00:10:121
1021791993228,2cyclictest1335151-21apt-get00:10:121
1021791993226,4cyclictest1146635-21ntpq21:05:201
1021791993126,3cyclictest1021994-21/usr/sbin/munin19:10:131
1021783993127,3cyclictest1047991-21gpgv19:35:010
1021798993026,3cyclictest1355677-21kworker/u8:2+flush-259:000:30:203
1021798993023,5cyclictest1021734-21latency_hist19:10:003
1021783993026,3cyclictest1329108-21kworker/u8:5+flush-259:000:20:200
1021783993026,3cyclictest1106515-21apt-get20:30:100
1021798992925,3cyclictest1132095-21kworker/u8:4+events_unbound20:58:203
1021798992925,3cyclictest1111644-21kworker/u8:0+events_unbound21:25:183
1021798992923,4cyclictest509-21rs:main3
1021791992924,3cyclictest1209676-21kworker/u8:0+flush-259:022:55:261
1021783992924,3cyclictest968674-21kworker/u8:4+events_unbound19:45:210
1021783992924,3cyclictest509-21rs:main0
1021798992825,2cyclictest1246463-21kworker/u8:4+flush-259:023:35:243
1021798992823,4cyclictest1220590-21kworker/u8:2+flush-259:022:25:173
1021798992823,4cyclictest1027169-21kworker/u8:0+events_unbound19:49:223
1021798992723,3cyclictest1037239-21kworker/u8:2+events_unbound19:30:233
1021798992722,3cyclictest1053778-21kworker/u8:3+events_unbound20:25:133
1021798992720,5cyclictest1090366-21latency_hist20:15:003
1021798992720,2cyclictest968674-21kworker/u8:4+events_unbound19:35:223
1021791992722,3cyclictest1168671-21kworker/u8:3+flush-259:021:55:001
1021791992721,4cyclictest509-21rs:main1
1021783992724,2cyclictest1282471-21gpgv23:20:000
1021783992723,3cyclictest1168671-21kworker/u8:3+flush-259:022:15:210
1021783992722,4cyclictest1111655-21/usr/sbin/munin20:35:250
1021798992622,3cyclictest1173834-21kworker/u8:5+events_unbound21:42:223
1021798992622,3cyclictest1168671-21kworker/u8:3+flush-259:022:05:003
1021798992621,4cyclictest968674-21kworker/u8:4+events_unbound19:19:213
1021798992621,4cyclictest1105875-21kworker/u8:2+events_unbound21:03:223
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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