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2026-03-11 - 05:37

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 Wed Mar 11, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
84962523050,3sleep375-21kworker/3:1-events21:31:463
96235821810,3sleep375-21kworker/3:1+events23:26:453
9222032680,2sleep375-21kworker/3:1+events22:46:413
706078996762,3cyclictest553443-21kworker/u8:0+events_unbound19:15:022
9800592620,6sleep20-21swapper/223:41:532
8957612590,5sleep30-21swapper/322:16:473
706073995746,8cyclictest1020861-21latency_hist00:25:010
7600172550,2sleep30-21swapper/320:01:463
706073995444,7cyclictest876948-21latency_hist22:00:010
706076995348,3cyclictest280-21systemd-journal22:31:441
7402412520,2chrt75-21kworker/3:1+events19:41:483
706078995140,8cyclictest280-21systemd-journal19:35:012
706073995133,15cyclictest965935-21latency_hist23:30:020
706073995041,6cyclictest742850-21latency_hist19:45:010
706076994937,8cyclictest280-21systemd-journal22:46:421
706076994738,7cyclictest713143-21kworker/u8:1+flush-8:019:21:491
706076994633,9cyclictest280-21systemd-journal20:56:441
706073994335,5cyclictest1035695-21latency_hist00:40:010
706073994325,16cyclictest817521-21apt-get21:01:370
706073994321,20cyclictest758015-21/usr/sbin/munin20:01:540
706073994236,4cyclictest3503926-21kworker/u8:4+flush-8:020:36:580
706073994223,16cyclictest786482-21ntpq20:26:520
706076994136,3cyclictest713143-21kworker/u8:1+events_unbound20:05:001
706076994133,6cyclictest3503926-21kworker/u8:4+flush-8:019:36:541
706076994133,6cyclictest176940-21kworker/u8:2+flush-8:019:16:551
706076994131,6cyclictest280-21systemd-journal23:16:431
706073994124,15cyclictest732600-21unixbench_multi19:31:580
706073994123,16cyclictest882801-21sort22:06:440
706073994123,16cyclictest865939-21needreboot21:46:490
7052482394,10sleep20-21swapper/219:06:572
706073993821,16cyclictest975054-21ntp_kernel_pll_23:36:490
706073993821,15cyclictest280-21systemd-journal20:15:010
706073993816,7cyclictest926391-21latency_hist22:50:000
706078993732,4cyclictest767531-21kworker/u8:0+events_unbound20:11:502
706076993731,4cyclictest872011-21latency_hist21:55:011
706076993731,4cyclictest176940-21kworker/u8:2+flush-8:020:41:561
706076993730,5cyclictest886602-21kworker/u8:2+flush-8:023:56:471
706076993730,4cyclictest1005784-21latency_hist00:10:001
706076993728,6cyclictest280-21systemd-journal21:25:011
706073993728,7cyclictest931975-21diskstats22:56:430
706073993723,13cyclictest611-21sshd00:32:430
706073993715,6cyclictest920685-21ntpq22:41:500
706073993715,6cyclictest920685-21ntpq22:41:500
9645112360,4sleep1281rcuc/123:26:471
70607399362,21cyclictest0-21swapper/023:46:550
706078993528,5cyclictest866918-21cp21:50:022
706076993528,3cyclictest0-21swapper/120:46:461
706073993417,3cyclictest1021285-21aten2_r5power_e00:26:400
706073993413,7cyclictest722215-21ntpq19:21:490
706076993328,3cyclictest897864-21irqrtprio22:21:461
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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