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2026-05-28 - 06:17

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 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 May 28, 2026 00:42:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
538083995748,6cyclictest1-21systemd22:10:011
538083995543,8cyclictest635476-21cat22:25:551
538083995543,8cyclictest635476-21cat22:25:551
538083995142,6cyclictest1-21systemd21:35:011
538083995142,6cyclictest1-21systemd21:35:011
538083995129,19cyclictest562586-21fschecks_count20:30:531
538083995126,21cyclictest719453-21aten_r2power_cu00:10:481
538083995021,7cyclictest698589-21sh23:45:011
538084994940,5cyclictest0-21swapper/222:46:002
53808399491,20cyclictest583553-21ssh21:21:041
538082994939,6cyclictest151ktimers/020:41:030
53808399484,26cyclictest724245-21ssh00:16:031
53808499475,32cyclictest671910-21ssh23:11:042
53808499475,32cyclictest671910-21ssh23:11:042
538084994738,6cyclictest420-21avahi-daemon22:05:012
538084994737,6cyclictest600037-21unixbench_singl21:41:102
538083994725,18cyclictest0-21swapper/123:15:001
538083994725,18cyclictest0-21swapper/123:15:001
53808399472,21cyclictest687951-21ssh23:31:011
53808499464,33cyclictest623675-21rm22:11:022
538083994637,5cyclictest694535-21cron23:40:011
53808399463,36cyclictest683889-21ssh23:26:001
538083994621,3cyclictest0-21swapper/123:25:001
538083994621,2cyclictest0-21swapper/119:55:011
538082994615,25cyclictest724378-21ssh00:16:090
538084994537,3cyclictest0-21swapper/200:10:022
538084994535,7cyclictest586025-21cron21:25:012
538083994537,5cyclictest630254-21systemd-run22:20:021
538083994537,5cyclictest630254-21systemd-run22:20:021
53808399452,36cyclictest599553-21ssh21:41:041
538083994521,3cyclictest0-21swapper/100:25:531
53808399451,22cyclictest615670-21ssh22:01:031
538084994436,5cyclictest575043-21fschecks_time21:10:522
538084994436,5cyclictest261-21systemd-journal23:25:012
538084994435,4cyclictest0-21swapper/221:06:092
538084994431,9cyclictest2903711-21cups-browsed23:35:012
538084994430,10cyclictest643734-21ntp_offset22:36:022
53808499442,31cyclictest663816-21ssh23:01:022
538083994435,5cyclictest0-21swapper/123:00:011
538083994422,3cyclictest694806-21kworker/u8:6-xprtiod23:45:461
53808399432,30cyclictest643700-21ssh22:36:011
538082994324,15cyclictest0-21swapper/000:05:540
538082994322,12cyclictest574061-21diskmemload22:46:010
538084994235,3cyclictest0-21swapper/200:05:002
538084994234,5cyclictest670438-21systemd-run23:10:012
538084994231,7cyclictest421-21dbus-daemon20:45:012
538083994233,6cyclictest642282-21grep22:35:001
538083994233,6cyclictest634318-21latency_hist22:25:011
538083994233,6cyclictest634318-21latency_hist22:25:011
538083994233,6cyclictest420-21avahi-daemon20:05:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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