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2025-09-03 - 21:05

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 50 highest latencies:
System rackeslot5s.osadl.org (updated Wed Sep 03, 2025 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
630699250,24cyclictest30331-21sh12:25:003
630299251,23cyclictest30337-21idleruntime-cro12:25:002
630299240,23cyclictest4622-21latency_hist10:25:002
630199240,23cyclictest19434-21awk10:55:011
630199240,23cyclictest0-21swapper/110:40:001
630099240,23cyclictest0-21swapper/012:30:150
630699230,22cyclictest9447-21munin-plugin-st10:35:013
630699230,22cyclictest4623-21awk10:25:003
630699230,22cyclictest18347-21sendmail-msp12:00:003
6302992320,2cyclictest18682-21idleruntime-cro07:35:012
630299230,22cyclictest21204-21perf07:40:012
630299230,0cyclictest25560-21apt-get08:55:172
6301992321,1cyclictest30811-21perf07:59:591
6301992321,1cyclictest15689-21awk08:34:591
6301992310,12cyclictest22-21ksoftirqd/109:25:151
630199230,23cyclictest0-21swapper/112:25:161
630199230,22cyclictest5656-21apt08:15:011
630199230,22cyclictest5656-21apt08:15:011
630199230,22cyclictest29763-21perf10:10:001
630199230,22cyclictest11123-21perf11:45:001
6300992321,1cyclictest7353-21apt-get09:24:590
6306992222,0cyclictest23157-21apt-get08:50:143
6306992220,1cyclictest9434-21apt-get10:35:023
6306992220,1cyclictest313-21systemd-journal12:15:013
6306992220,1cyclictest313-21systemd-journal07:35:013
6306992220,1cyclictest22127-21apt-get11:00:113
630699220,21cyclictest8951-21apt-get07:15:123
630699220,21cyclictest15948-21apt-get08:35:143
630699220,21cyclictest13548-21apt-get08:30:143
630699220,21cyclictest0-21swapper/309:55:133
630699220,1cyclictest0-21swapper/309:05:003
6302992222,0cyclictest0-21swapper/208:50:142
6302992221,1cyclictest0-21swapper/212:35:022
6302992221,0cyclictest1129-21apt-get08:05:142
6302992220,1cyclictest25525-21ls12:15:002
6302992220,1cyclictest10096-21apt-get10:35:112
630299220,21cyclictest30110-21perf09:05:012
630299220,21cyclictest22830-21apt-get09:55:132
630299220,21cyclictest15245-21apt-get09:40:132
630299220,21cyclictest0-21swapper/210:35:002
630299220,1cyclictest18345-21awk12:00:002
630299220,1cyclictest12521-21apt-get10:40:132
6301992221,0cyclictest0-21swapper/107:25:131
6301992220,1cyclictest32509-21munin-run09:10:011
6301992220,1cyclictest17058-21munin-run10:50:011
6301992220,1cyclictest1493-21cron11:25:001
630199220,21cyclictest4948-21turbostat09:20:001
630199220,21cyclictest3458-21apt-get12:35:151
630199220,21cyclictest28422-21idleruntime-cro07:54:591
630199220,21cyclictest0-21swapper/110:19:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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