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2026-06-06 - 04:15

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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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Sat Jun 06, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
5662921840,2sleep3481ktimers/323:55:013
3965376996153,6cyclictest36528-21/usr/sbin/munin23:35:501
3965379995751,4cyclictest4119222-21kworker/u8:1+events_unbound23:00:452
3965379995652,3cyclictest4056833-21kworker/u8:1+events_unbound21:10:512
3965372995441,10cyclictest4171419-21diskstats22:35:370
3965372995343,7cyclictest4055918-21ntpq20:35:450
3965376995140,8cyclictest1704890-21systemd-journal20:00:021
41677442490,5chrt0-21swapper/222:30:412
3965376994942,6cyclictest3960308-21kworker/u8:3+flush-8:019:20:451
3965376994842,5cyclictest4086787-21kworker/u8:0+flush-8:021:15:471
3965376994839,7cyclictest4065853-21ntpq20:45:471
3965376994839,7cyclictest4050931-21ntpq20:30:451
3965372994736,8cyclictest4067255-21diskstats20:50:340
3965379994641,4cyclictest4119222-21kworker/u8:1+events_unbound22:20:492
3965376994640,4cyclictest4006813-21kworker/u8:2+flush-8:020:05:371
3965376994636,8cyclictest4030936-21ntpq20:10:461
3965376994535,8cyclictest35349-21ntpq23:30:441
3965372994440,3cyclictest61562-21kworker/u8:3+events_unbound00:10:510
3965376994235,4cyclictest4006813-21kworker/u8:2+flush-8:019:55:371
3965372994236,4cyclictest4032099-21apt-get20:15:330
40156872410,5sleep3451irq_work/319:55:433
3965379994137,3cyclictest4119222-21kworker/u8:1+events_unbound21:50:002
3965376994136,3cyclictest11513-21kworker/u8:2+events_unbound00:05:331
3965376994131,8cyclictest4161250-21/usr/sbin/munin22:25:501
3965376994034,4cyclictest4006813-21kworker/u8:2+flush-8:019:50:501
396537299402,37cyclictest4086563-21kworker/0:0+events00:18:530
3965379993935,3cyclictest3933392-21kworker/u8:1+flush-8:019:15:502
3965379993929,8cyclictest46510-21apt-get23:45:012
3965376993934,3cyclictest96433-21apt-get00:35:321
3965379993834,3cyclictest11513-21kworker/u8:2+flush-8:023:45:362
3965376993830,6cyclictest1704890-21systemd-journal22:15:491
3965376993830,6cyclictest1704890-21systemd-journal20:21:491
3965376993828,8cyclictest4121707-21diskstats21:45:351
3965376993731,4cyclictest80478-21ntpq00:15:471
3965372993729,6cyclictest4051828-21latency_hist20:35:010
3965376993632,3cyclictest4036755-21munin-run20:20:011
3965376993631,3cyclictest4116523-21apt-get21:40:301
3965376993628,6cyclictest1912-21apt-get23:00:321
3965376993530,3cyclictest4119222-21kworker/u8:1+flush-8:021:55:421
3965376993529,4cyclictest4006813-21kworker/u8:2+flush-8:020:55:481
3965376993529,4cyclictest3945595-21kworker/u8:0+flush-8:019:45:361
3965376993528,6cyclictest4119222-21kworker/u8:1+flush-8:022:40:481
3965376993527,6cyclictest90823-21grep00:25:501
396537299352,31cyclictest4086563-21kworker/0:0+events21:43:210
396537299352,28cyclictest3970448-21kworker/0:0+events19:40:130
396537299352,28cyclictest3970448-21kworker/0:0+events19:40:130
396490323521,9sleep10-21swapper/119:06:301
69382340,2sleep3471rcuc/323:05:333
69382340,2sleep3471rcuc/323:05:323
3965379993430,3cyclictest4051585-21kworker/u8:0+events_unbound20:45:432
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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