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2026-08-10 - 15:02

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 Mon Aug 10, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
56117223310,2sleep3575-21kworker/3:2+events07:22:523
58629421870,3sleep3575-21kworker/3:2-events07:47:523
74122021780,3sleep3575-21kworker/3:2+events10:22:523
5473489910285,15cyclictest0-21swapper/009:52:550
547353998178,1cyclictest0-21swapper/209:52:542
547350995954,4cyclictest669288-21kworker/u8:1+events_unbound09:43:011
547350994837,8cyclictest275-21systemd-journal10:25:001
547348994841,5cyclictest803060-21latency_hist11:25:010
547348994638,5cyclictest723739-21latency_hist10:05:010
547348994636,8cyclictest683368-21ntpq09:22:580
547348994636,8cyclictest683368-21ntpq09:22:580
6120912440,2chrt0-21swapper/208:12:552
547350994435,6cyclictest275-21systemd-journal09:10:081
547348994435,6cyclictest614147-21latency_hist08:15:010
5937962420,2sleep3471rcuc/307:53:023
547350994238,2cyclictest711655-21cut09:52:541
547350994028,9cyclictest275-21systemd-journal12:23:121
547350993927,9cyclictest275-21systemd-journal09:39:081
547348993833,3cyclictest629425-21latency_hist08:30:010
547348993831,5cyclictest275-21systemd-journal07:52:340
547353993729,6cyclictest639577-21base6408:40:012
547350993729,6cyclictest807323-21kworker/u8:2+events_unbound12:37:481
547350993729,6cyclictest547691-21/usr/sbin/munin07:12:571
6565812360,2sleep3575-21kworker/3:2+mm_percpu_wq08:57:543
547353993628,6cyclictest275-21systemd-journal07:35:002
547348993630,4cyclictest275-21systemd-journal12:00:000
547348993628,6cyclictest510439-21kworker/u8:2+flush-8:007:48:000
5426682363,8sleep10-21swapper/107:06:261
547350993428,4cyclictest663578-21ntpq09:03:001
547350993425,6cyclictest275-21systemd-journal07:28:421
547350993422,9cyclictest275-21systemd-journal10:33:071
547350993422,9cyclictest275-21systemd-journal10:33:071
547353993324,7cyclictest604026-21apt-get08:05:002
547350993328,3cyclictest772870-21unixbench_multi10:53:051
547348993325,6cyclictest807995-21latency_hist11:30:010
7541132320,10sleep0141ktimers/010:37:500
547353993223,6cyclictest728638-21cron10:10:002
547348993225,5cyclictest787975-21unixbench_multi11:08:040
547348993224,6cyclictest808696-21diskstats11:32:470
547353993121,8cyclictest778090-21apt-get11:00:002
547348993127,2cyclictest823323-21latency_hist11:45:000
547348993126,3cyclictest863486-21aten2_r5power_v12:27:470
547348993126,3cyclictest744132-21tr10:27:460
547348993126,3cyclictest0-21swapper/008:10:010
547348993126,2cyclictest568979-21sh07:30:000
547348993123,6cyclictest639160-21latency_hist08:40:010
547348993123,4cyclictest0-21swapper/008:02:590
547348993122,6cyclictest868599-21grep12:32:490
7014132300,2sleep3575-21kworker/3:2+events09:42:523
547353993022,6cyclictest847962-21gpgv12:10:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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