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2026-06-01 - 19:56

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 Jun 01, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2802814995929,18cyclictest3028269-21apt-get10:55:002
2802810995547,6cyclictest2894178-21kworker/u8:1+flush-8:009:30:561
2802810995243,7cyclictest2814888-21/usr/sbin/munin07:20:561
2802810995147,3cyclictest2894178-21kworker/u8:1+flush-8:009:20:531
2802810995039,9cyclictest2806905-21ntpq07:10:521
2802810994942,5cyclictest2988848-21kworker/u8:3+flush-8:011:20:501
2802810994940,7cyclictest3103002-21cp12:09:591
2802810994938,8cyclictest2987503-21ntpq10:10:481
2802810994842,4cyclictest3102923-21http12:10:011
2802810994839,6cyclictest2988848-21kworker/u8:3+flush-8:010:15:521
2802806994738,7cyclictest2983727-21/usr/sbin/munin10:10:530
2802810994636,8cyclictest3027393-21ntpq10:50:501
2802810994541,3cyclictest2758011-21kworker/u8:2+flush-8:007:25:531
280280699451,24cyclictest1704814-21sshd11:03:480
2802806994434,7cyclictest2888926-21latency_hist08:35:000
2802810994338,4cyclictest2758011-21kworker/u8:2+flush-8:007:35:411
2802810994332,8cyclictest2952435-21ntpq09:35:491
2802810994331,8cyclictest1704890-21systemd-journal07:31:081
2802806994337,4cyclictest2889224-21apt-get08:35:360
2802806994335,5cyclictest2839293-21latency_hist07:45:000
2802806994334,6cyclictest2948357-21latency_hist09:35:010
2802810994237,4cyclictest2894178-21kworker/u8:1+flush-8:009:45:411
2802810994237,3cyclictest2998781-21kworker/u8:1+flush-8:010:40:411
2802810994231,8cyclictest1704890-21systemd-journal11:00:001
2802806994232,8cyclictest2922692-21ntpq09:05:500
2802814994125,14cyclictest2874709-21fschecks_count08:20:412
2802814994120,18cyclictest3068793-21fschecks_count11:35:402
2802810994135,5cyclictest2843904-21kworker/u8:1+events_unbound08:05:021
2802810994134,5cyclictest2843347-21ntpq07:45:501
2802806994121,17cyclictest0-21swapper/008:45:440
2802814994026,12cyclictest3029077-21fschecks_count10:55:402
2802814994026,12cyclictest2864823-21fschecks_time08:10:442
2802814994021,17cyclictest2859922-21fschecks_time08:05:402
2802810994034,4cyclictest2758011-21kworker/u8:2+flush-8:009:25:451
2802810994033,5cyclictest2758011-21kworker/u8:2+flush-8:009:00:531
2802810994031,6cyclictest1704890-21systemd-journal10:34:471
2802806994032,5cyclictest2992645-21ntpq10:15:460
2802806994022,16cyclictest2853714-21unixbench_singl07:55:550
2802814993933,4cyclictest2983464-21munin-plugin-st10:10:002
2802814993923,14cyclictest2879667-21fschecks_count08:25:412
2802810993931,6cyclictest3127543-21kworker/u8:0+flush-8:012:35:501
280280699397,20cyclictest0-21swapper/007:32:370
2802806993925,12cyclictest2848291-21ntpq07:50:500
2802806993924,13cyclictest2897898-21needreboot08:40:480
2802806993921,16cyclictest2963475-21cron09:50:010
2802814993823,13cyclictest3083685-21fschecks_count11:50:392
2802814993823,13cyclictest3048881-21fschecks_count11:15:402
2802810993831,5cyclictest2894178-21kworker/u8:1+events_unbound08:45:491
2802810993831,4cyclictest2998518-21latency_hist10:25:011
2802810993830,6cyclictest2868829-21kworker/u8:0+flush-8:008:30:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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