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2025-09-18 - 13:33

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 Thu Sep 18, 2025 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
34916692730,2chrt662-21kworker/3:2-events21:20:003
35898802640,5chrt0-21swapper/023:00:530
34467672590,6sleep20-21swapper/220:30:442
3364702995949,7cyclictest3566857-21latency_hist22:40:011
34444262520,3chrt662-21kworker/3:2+events20:25:513
3364702995243,7cyclictest3562125-21kworker/u8:2+flush-8:022:51:001
3364702995144,5cyclictest3451416-21kworker/u8:1+flush-8:020:51:031
3364702995143,6cyclictest3471463-21/usr/sbin/munin20:55:581
3364702995139,4cyclictest3611641-21kworker/u8:3+events_unbound00:05:501
3364702995040,3cyclictest3307827-21kworker/u8:1+events_unbound19:30:461
3364702994943,5cyclictest3451416-21kworker/u8:1+flush-8:022:06:011
3364702994843,4cyclictest3400909-21kworker/u8:2+flush-8:019:45:461
3364702994841,5cyclictest2521540-21kworker/u8:3+flush-8:020:40:591
3364702994641,4cyclictest3451416-21kworker/u8:1+events_unbound22:15:441
3364698994630,14cyclictest3411326-21sh19:55:000
3364698994626,18cyclictest3496552-21latency_hist21:25:010
3364702994540,4cyclictest2521540-21kworker/u8:3+events_unbound20:45:491
3364698994537,6cyclictest3385496-21ntpq19:25:520
3364698994527,16cyclictest3556521-21unixbench_multi22:26:000
3364702994440,3cyclictest2521540-21kworker/u8:3+events_unbound20:30:521
3364702994439,3cyclictest3486868-21kworker/u8:0+flush-8:021:40:511
3364698994431,11cyclictest3425308-21ntpq20:05:550
3364698994416,21cyclictest421rcuog/220:51:040
3364702994339,3cyclictest3616610-21kworker/u8:2+events_unbound23:41:001
3364702994337,5cyclictest3611641-21kworker/u8:3+events_unbound00:25:481
3364698994332,8cyclictest3461068-21apt-get20:45:010
3364702994237,4cyclictest3451416-21kworker/u8:1+events_unbound22:25:441
3364702994237,4cyclictest2521540-21kworker/u8:3+events_unbound21:30:501
3364702994236,5cyclictest3307827-21kworker/u8:1+flush-8:019:16:031
3364698994238,3cyclictest3451416-21kworker/u8:1+events_unbound22:15:480
3364698994225,15cyclictest3576352-21unixbench_multi22:46:010
336469899420,25cyclictest3369737-21install19:15:010
3364702994137,3cyclictest2521540-21kworker/u8:3+events_unbound19:25:461
3364702994135,5cyclictest2521540-21kworker/u8:3+events_unbound21:15:461
3364702994134,5cyclictest3461543-21kworker/u8:2+flush-8:021:10:521
3364698994129,10cyclictest3481977-21apt-get21:10:380
3364698994124,15cyclictest0-21swapper/020:00:470
3364698994124,15cyclictest0-21swapper/020:00:470
3364702994036,3cyclictest3426198-21kworker/u8:0+events_unbound20:20:011
3364702994034,4cyclictest3441099-21gpgv20:25:001
3364698994011,21cyclictest0-21swapper/000:18:400
3364705993933,4cyclictest3521522-21gpgv21:50:002
3364705993933,4cyclictest3521522-21gpgv21:50:002
3364702993934,4cyclictest3611641-21kworker/u8:3+flush-8:023:25:501
3364702993934,4cyclictest3572014-21kworker/u8:1+flush-8:000:15:591
3364702993934,4cyclictest3451416-21kworker/u8:1+events_unbound22:20:471
3364702993933,4cyclictest3451416-21kworker/u8:1+flush-8:022:11:001
3364702993933,4cyclictest2521540-21kworker/u8:3+flush-8:019:55:531
3364702993932,5cyclictest3616646-21apt-get23:30:381
3364698993923,14cyclictest3521498-21latency_hist21:50:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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