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2025-03-12 - 22:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot3s.osadl.org (updated Wed Mar 12, 2025 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3333646992926,2cyclictest3515991-21apt-get12:00:010
333364999287,17cyclictest3446969-21ntpq10:40:491
3333652992723,3cyclictest3345421-21tracker-extract07:39:382
3333656992623,2cyclictest3382932-21sh09:20:003
3333656992622,2cyclictest712-21tpm2-abrmd12:05:013
3333652992622,2cyclictest3460835-21sendmail11:00:012
3333652992621,3cyclictest3465124-21munin-plugin-st11:05:002
3333656992521,2cyclictest0-21swapper/308:35:013
333365299255,5cyclictest3397095-21sh09:37:292
3333652992522,2cyclictest3515966-21apt-get12:00:002
3333649992521,2cyclictest0-21swapper/112:10:001
3333646992521,2cyclictest715-21in:imuxsock11:00:000
333364999247,3cyclictest3374695-21diskmemload10:24:041
3333656992320,2cyclictest3414210-21sendmail10:00:003
3333656992316,4cyclictest3539344-21sh12:20:543
3333656992315,6cyclictest3345421-40tracker-extract07:39:403
3333656992315,5cyclictest3445451-21cron10:40:013
3333652992318,3cyclictest0-21swapper/211:19:592
333365299231,18cyclictest3540963-21ssh12:22:532
3333649992319,2cyclictest0-21swapper/112:05:001
333364999231,8cyclictest3509920-21sh11:54:221
3333646992319,2cyclictest3394728-21cpuspeed_turbos09:35:140
3333646992311,8cyclictest3532675-21ntp_192.168.11412:15:170
3333656992218,2cyclictest3495187-21turbostat11:40:003
3333656992217,3cyclictest3495658-21cpuspeed_turbos11:40:143
3333656992217,3cyclictest3346963-21pmu-power07:40:203
3333656992213,6cyclictest262-21systemd-journal11:48:133
3333656992212,6cyclictest3424626-21sh10:13:023
3333652992218,2cyclictest3548428-21switchtime12:30:182
3333652992217,4cyclictest3505318-21/usr/sbin/munin11:50:122
333365299221,18cyclictest3449009-21ssh10:43:322
3333649992219,2cyclictest0-21swapper/110:40:011
3333649992218,2cyclictest3351978-21/usr/sbin/munin07:55:121
333364999221,7cyclictest3381819-21ssh09:17:581
3333649992211,8cyclictest726-21gdbus08:55:001
3333649992210,6cyclictest3359860-21strings08:20:141
3333646992219,2cyclictest3362894-21cron08:30:010
3333646992219,2cyclictest3362894-21cron08:30:000
3333646992218,2cyclictest3337530-21sh07:19:590
3333646992217,3cyclictest3488176-21sh11:33:060
3333646992217,3cyclictest3418881-21sh10:05:060
3333646992217,3cyclictest0-21swapper/012:10:010
3333646992212,7cyclictest942-21snmpd11:42:340
333364699220,19cyclictest3440086-21taskset10:32:430
333365699214,4cyclictest3467645-21sh11:09:153
333365699211,7cyclictest3463325-21ssh11:01:493
3333656992114,5cyclictest3361928-21ldconfig08:25:503
3333656992114,5cyclictest3361928-21ldconfig08:25:493
333365699211,18cyclictest3532551-21ssh12:15:153
333365299211,7cyclictest3532354-21smartctl12:15:132
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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