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2026-07-23 - 10:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 here to display the system's profile data or here to proceed to next system.
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 rack2slot7s.osadl.org (updated Thu Jul 23, 2026 00:43:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3929494996349,11cyclictest4033135-21grep23:05:010
3929496995839,16cyclictest3996118-21tr22:00:012
3929496995731,22cyclictest4068165-21unixbench-2d00:00:552
3929494995226,23cyclictest0-21swapper/022:25:510
3929494995224,17cyclictest12650irq/32-eth000:05:470
3929495995125,22cyclictest0-21swapper/100:25:521
3929494995143,5cyclictest4066519-21plymouth00:00:010
3929496995041,5cyclictest485-21in:imuxsock00:00:022
3929495995041,6cyclictest4008235-21ssh22:20:011
392949599503,7cyclictest4046349-21ssh23:25:441
3929494995042,5cyclictest0-21swapper/022:00:460
3929495994839,6cyclictest4066570-21cups-browsed00:00:021
3929495994836,8cyclictest421-21dbus-daemon22:00:011
3929494994830,11cyclictest0-21swapper/023:20:440
392949499473,35cyclictest4055570-21ssh23:40:500
392949499472,39cyclictest3969775-21ssh21:15:490
3929496994625,14cyclictest265-21systemd-journal19:55:472
3929494994637,6cyclictest4053105-21/usr/sbin/munin23:36:030
3929494994636,7cyclictest3986970-21ssh21:45:000
3929494994636,7cyclictest3986970-21ssh21:45:000
3929494994635,8cyclictest3965927-21/usr/sbin/munin21:10:560
3929495994537,5cyclictest4008840-21aten_r2power_vo22:20:361
3929495994535,6cyclictest0-21swapper/119:25:011
3929495994535,6cyclictest0-21swapper/119:25:011
3929495994524,18cyclictest0-21swapper/100:35:411
3929495994430,11cyclictest4011895-21cpu22:25:351
392949599442,7cyclictest3950010-21ntpq20:15:491
392949599442,14cyclictest3965088-21ps21:05:571
3929494994423,11cyclictest151ktimers/020:25:460
3929494994422,11cyclictest151ktimers/023:05:430
392949599433,8cyclictest3948437-21ntpq20:10:461
3929495994334,6cyclictest3987021-21latency_hist21:45:011
3929495994334,6cyclictest3987021-21latency_hist21:45:011
392949599432,6cyclictest4037376-21ssh23:10:491
392949599432,14cyclictest3978476-21diskstats21:30:391
3929494994331,9cyclictest427-21polkitd20:03:470
392949599421,10cyclictest4022193-21ntpq22:45:511
392949599414,6cyclictest4000248-21ssh22:05:461
392949599412,6cyclictest4084571-21ntpq00:30:421
392949599412,6cyclictest3945368-21ntpq20:00:451
392949599411,14cyclictest4031167-21ssh23:00:451
392949599411,11cyclictest3958880-21ntpq20:45:431
392949599411,10cyclictest3964010-21sshd21:01:471
392949599411,10cyclictest3955890-21ntpq20:35:451
392949599411,10cyclictest3940973-21ntpq19:45:531
3929494994133,5cyclictest4000425-21proc_pri22:05:530
3929494994132,7cyclictest4089618-21cat00:40:010
3929494994126,12cyclictest0-21swapper/022:25:010
3929496994032,5cyclictest4002195-21systemd-run22:10:012
3929496994031,6cyclictest4012318-21needreboot22:25:422
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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