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2026-05-01 - 04:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Fri May 01, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
301625123510,6sleep3451irq_work/321:21:143
301625123510,6sleep3451irq_work/321:21:143
31265862730,3chrt201rcuc/023:11:140
31265862730,3chrt201rcuc/023:11:140
30147722600,1sleep03014774-21cat21:21:110
30147722600,1sleep03014774-21cat21:21:110
2882579995749,6cyclictest280-21systemd-journal22:00:010
2882579995651,3cyclictest2908916-21kworker/u8:3+flush-8:023:00:000
2882579995346,5cyclictest2908916-21kworker/u8:3+flush-8:000:06:170
2882579995346,5cyclictest2908916-21kworker/u8:3+events_unbound20:01:180
2882584995245,5cyclictest2908916-21kworker/u8:3+flush-8:020:26:051
2882579995247,4cyclictest2908916-21kworker/u8:3+events_unbound21:01:180
2882579995246,4cyclictest2894995-21kworker/u8:0+events_unbound19:35:000
2882579995246,4cyclictest2894995-21kworker/u8:0+events_unbound19:35:000
2882584995145,5cyclictest2894995-21kworker/u8:0+flush-8:020:46:051
2882584995144,5cyclictest2894995-21kworker/u8:0+flush-8:020:16:171
2882584995045,3cyclictest2894995-21kworker/u8:0+flush-8:021:11:061
2882579995045,3cyclictest3183365-21kworker/u8:2+flush-8:000:16:180
2882579994944,4cyclictest3147496-21kworker/u8:0+flush-8:000:01:160
2882579994844,3cyclictest3083607-21kworker/u8:2+events_unbound22:46:180
2882579994842,4cyclictest3032904-21kworker/u8:0+flush-8:021:51:130
2882579994841,5cyclictest3157435-21kworker/u8:1+flush-8:023:46:170
2882584994740,5cyclictest2908916-21kworker/u8:3+flush-8:020:11:041
2882584994739,5cyclictest280-21systemd-journal22:03:271
2882584994736,8cyclictest3132137-21ntpq23:16:171
2882579994741,4cyclictest2908916-21kworker/u8:3+flush-8:023:10:010
2882584994634,9cyclictest280-21systemd-journal00:35:001
2882579994642,3cyclictest2894995-21kworker/u8:0+flush-8:020:46:170
2882579994640,4cyclictest3122546-21kworker/u8:1+flush-8:023:21:190
2882579994639,5cyclictest2908916-21kworker/u8:3+flush-8:023:51:160
2882584994539,5cyclictest3058375-21kworker/u8:2+flush-8:022:11:071
2882584994533,9cyclictest280-21systemd-journal19:30:001
2882584994533,9cyclictest280-21systemd-journal19:30:001
2882579994540,4cyclictest2908916-21kworker/u8:3+flush-8:023:16:150
2882579994540,3cyclictest3122546-21kworker/u8:1+flush-8:023:31:120
2882579994539,4cyclictest3013632-21kworker/u8:2+flush-8:021:41:200
2882579994538,5cyclictest3058375-21kworker/u8:2+flush-8:022:11:170
2882579994532,10cyclictest2999429-21diskstats21:06:060
2882588994432,9cyclictest2914300-21awk19:40:002
2882584994440,3cyclictest2894995-21kworker/u8:0+flush-8:019:51:191
2882584994439,4cyclictest3147496-21kworker/u8:0+flush-8:000:36:071
2882584994436,6cyclictest3137895-21latency_hist23:25:011
2882584994433,9cyclictest3188394-21/usr/sbin/munin00:21:141
2882584994432,9cyclictest3042755-21ntpq21:46:131
2882584994431,10cyclictest2973217-21ntpq20:36:151
2882579994339,3cyclictest3083607-21kworker/u8:2+events_unbound22:41:190
2882579994338,4cyclictest3083607-21kworker/u8:2+flush-8:022:51:120
2882579994338,4cyclictest2780337-21kworker/u8:2+flush-8:019:26:140
2882579994338,4cyclictest2780337-21kworker/u8:2+flush-8:019:26:140
2882579994338,3cyclictest3137624-21kworker/u8:2+flush-8:023:41:150
2882579994336,5cyclictest2889489-21kworker/u8:3+flush-8:019:16:150
2882579994335,5cyclictest2974103-21latency_hist20:40:010
2882584994234,6cyclictest3032904-21kworker/u8:0+events_unbound21:51:171
2882579994237,4cyclictest2908916-21kworker/u8:3+flush-8:020:21:160
2882579994236,4cyclictest2964465-21kworker/u8:1+events_unbound20:51:130
2882579994235,5cyclictest2894995-21kworker/u8:0+flush-8:019:41:140
2882579994137,3cyclictest3013632-21kworker/u8:2+events_unbound21:26:170
2882579994136,3cyclictest2894995-21kworker/u8:0+events_unbound19:36:140
2882579994136,3cyclictest2041271-21kworker/u8:1+events_unbound19:21:210
2882579994135,4cyclictest3032904-21kworker/u8:0+events_unbound22:16:160
2882579994033,5cyclictest3157435-21kworker/u8:1+flush-8:000:31:170
2882588993930,7cyclictest280-21systemd-journal19:15:002
2882584993934,4cyclictest3147496-21kworker/u8:0+flush-8:023:36:201
2882584993932,5cyclictest3083607-21kworker/u8:2+flush-8:022:36:151
2882579993933,4cyclictest2908916-21kworker/u8:3+events_unbound23:01:090
2882579993930,7cyclictest3062615-21ntpq22:06:140
288257999391,36cyclictest1-21systemd20:00:010
29667272380,6sleep3451irq_work/320:31:103
2882584993832,5cyclictest3058375-21kworker/u8:2+flush-8:022:06:161
2882584993828,7cyclictest280-21systemd-journal23:54:591
2882579993832,4cyclictest2894995-21kworker/u8:0+flush-8:021:11:160
2882579993832,4cyclictest2894995-21kworker/u8:0+events_unbound19:46:060
2882579993830,5cyclictest2908916-21kworker/u8:3+flush-8:021:36:150
2882584993733,3cyclictest2964465-21kworker/u8:1+flush-8:020:41:041
2882584993733,3cyclictest2894995-21kworker/u8:0+flush-8:019:36:051
2882584993732,3cyclictest2894995-21kworker/u8:0+flush-8:019:45:001
2882584993731,4cyclictest3032904-21kworker/u8:0+flush-8:022:31:071
2882579993733,2cyclictest2908916-21kworker/u8:3+events_unbound20:26:140
2882579993731,4cyclictest2908916-21kworker/u8:3+events_unbound20:11:150
2882579993725,9cyclictest3082433-21ntpq22:26:130
2882579993724,10cyclictest280-21systemd-journal23:30:010
2882584993631,3cyclictest3032904-21kworker/u8:0+events_unbound22:16:071
2882579993631,4cyclictest3032904-21kworker/u8:0+events_unbound22:21:160
2882579993628,6cyclictest2894995-21kworker/u8:0+events_unbound21:16:000
2882579993531,3cyclictest3032904-21kworker/u8:0+events_unbound22:01:180
2882579993531,3cyclictest2908916-21kworker/u8:3+flush-8:020:31:070
2882584993430,3cyclictest3122546-21kworker/u8:1+events_unbound23:31:171
2882584993430,3cyclictest2908916-21kworker/u8:3+flush-8:021:06:211
2882584993428,4cyclictest2908916-21kworker/u8:3+flush-8:021:31:111
2882584993428,4cyclictest2041271-21kworker/u8:1+flush-8:019:21:061
2882584993424,7cyclictest2954635-21/usr/sbin/munin20:21:131
2882579993425,7cyclictest2928489-21ntpq19:51:150
2882579993424,8cyclictest3151849-21ntpq23:36:140
2882588993327,4cyclictest3013632-21kworker/u8:2+flush-8:021:31:172
2882584993327,4cyclictest2994221-21apt-get21:01:011
2882584993326,5cyclictest3083607-21kworker/u8:2+events_unbound22:46:081
2882584993325,6cyclictest3183457-21apt-get00:15:571
2882584993325,6cyclictest3147496-21kworker/u8:0+events_unbound00:01:191
2882579993329,3cyclictest2863033-21kworker/u8:0+flush-8:019:11:200
2882579993326,5cyclictest3157435-21kworker/u8:1+flush-8:000:26:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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