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2025-08-30 - 00:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 20 highest latencies:
System rackeslot5s.osadl.org (updated Fri Aug 29, 2025 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17879992523,1cyclictest13-21ksoftirqd/009:55:010
17879992523,1cyclictest0-21swapper/008:44:480
1789399240,23cyclictest17443-21apt-get08:19:493
1789399240,23cyclictest14652-21basename11:30:003
1788599240,23cyclictest13402-21apt-get12:34:512
17883992423,1cyclictest11203-21apt-get10:19:491
17883992422,1cyclictest9827-21sendmail11:20:001
1788399240,23cyclictest25004-21idleruntime-cro10:45:001
17879992422,1cyclictest13-21ksoftirqd/010:40:000
1787999240,24cyclictest0-21swapper/008:29:490
17893992321,1cyclictest0-21swapper/310:05:013
1789399230,23cyclictest0-21swapper/310:29:523
1789399230,22cyclictest16541-21grep08:15:003
17885992323,0cyclictest0-21swapper/211:24:482
17885992320,2cyclictest19858-21apt-get08:20:022
1788399230,22cyclictest28433-21turbostat09:45:001
1788399230,22cyclictest15686-21apt-get11:34:481
1788399230,1cyclictest26065-21cron09:39:591
17879992321,2cyclictest13-21ksoftirqd/008:09:480
1787999230,22cyclictest7314-21munin-plugin-st11:15:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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