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2026-06-29 - 03:18

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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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 Mon Jun 29, 2026 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35517842780,3chrt0-21swapper/223:30:322
3287229996155,4cyclictest3357920-21kworker/u8:0+flush-8:022:00:300
3287229995950,6cyclictest1704890-21systemd-journal00:30:260
3287232995450,3cyclictest3377826-21kworker/u8:2+flush-8:021:05:311
3287232995348,4cyclictest3377826-21kworker/u8:2+flush-8:022:15:301
3287229995346,5cyclictest3377826-21kworker/u8:2+events_unbound21:35:330
3287229995343,7cyclictest3312898-21ntpq19:30:260
3287232995248,3cyclictest3478410-21kworker/u8:1+flush-8:022:45:321
3287232995247,4cyclictest3308920-21kworker/u8:3+flush-8:020:15:321
35976892510,1chrt3597690-21/usr/sbin/munin00:20:162
3287229995047,2cyclictest3357920-21kworker/u8:0+events_unbound20:35:310
3287232994836,9cyclictest3382502-21ntpq20:40:251
3287232994743,3cyclictest3319034-21kworker/u8:1+flush-8:020:35:311
3287232994636,8cyclictest1704890-21systemd-journal19:45:271
3287232994535,7cyclictest1704890-21systemd-journal21:45:001
3287234994434,8cyclictest1704890-21systemd-journal20:40:012
3287232994440,3cyclictest2994733-21kworker/u8:2+flush-8:020:20:301
3287232994438,5cyclictest3143449-21kworker/u8:4+flush-8:019:10:281
3287232994436,6cyclictest3377826-21kworker/u8:2+flush-8:021:10:281
3287229994440,3cyclictest3319034-21kworker/u8:1+events_unbound20:12:280
32925012430,3chrt201rcuc/019:15:020
328723499438,18cyclictest3508180-21apt-get22:50:142
3287232994339,3cyclictest3601852-21kworker/u8:2+events_unbound00:25:321
3287232994339,3cyclictest3357920-21kworker/u8:0+flush-8:000:10:261
3287232994238,3cyclictest3357920-21kworker/u8:0+flush-8:022:40:311
3287232994235,5cyclictest3433052-21latency_hist21:35:001
3287229994233,6cyclictest3442994-21latency_hist21:45:000
3287232994132,6cyclictest1704890-21systemd-journal19:58:251
3287232994036,3cyclictest3377826-21kworker/u8:2+flush-8:022:30:311
3287232994028,9cyclictest3457090-21ntpq21:55:251
3287229994036,3cyclictest3377826-21kworker/u8:2+events_unbound21:22:540
3287232993931,5cyclictest1704890-21systemd-journal19:35:261
3287232993931,5cyclictest1704890-21systemd-journal19:35:251
3287229993935,3cyclictest3357920-21kworker/u8:0+events_unbound20:34:290
3287232993833,4cyclictest3388044-21kworker/u8:1+flush-8:020:55:321
3287232993832,4cyclictest2994733-21kworker/u8:2+events_unbound20:05:311
3287232993826,9cyclictest1704890-21systemd-journal21:39:271
3287229993834,3cyclictest3388044-21kworker/u8:1+events_unbound20:49:270
3287229993830,6cyclictest3552419-21latency_hist23:35:000
3287229993828,7cyclictest3337920-21ntpq19:55:260
3287232993732,4cyclictest3478410-21kworker/u8:1+flush-8:023:45:281
3287232993731,4cyclictest3552644-21kworker/u8:3+flush-8:000:00:261
3287229993731,4cyclictest1704890-21systemd-journal22:08:010
3287229993731,4cyclictest1704890-21systemd-journal22:08:010
3287229993727,7cyclictest3302983-21ntpq19:20:240
33889542360,3sleep3471rcuc/320:50:173
3287229993632,3cyclictest3478410-21kworker/u8:1+events_unbound22:54:390
3287232993530,4cyclictest2994733-21kworker/u8:2+events_unbound19:25:201
3287232993528,5cyclictest3602203-21latency_hist00:25:011
3287232993528,5cyclictest3319034-21kworker/u8:1+flush-8:020:10:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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