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2026-03-28 - 21:00

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 Sat Mar 28, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7471299563,38cyclictest243861-21ssh11:50:271
74713995326,20cyclictest421-21dbus-daemon10:00:272
74711994835,11cyclictest280181-21aten_r2power_cu12:35:170
74711994732,12cyclictest101730-21systemd-run08:40:020
74711994620,21cyclictest247979-21ssh11:55:280
74713994537,5cyclictest213934-21sh11:15:012
74713994537,5cyclictest1-21systemd07:55:012
74713994534,7cyclictest421-21dbus-daemon11:45:442
74711994537,5cyclictest439-21systemd-logind11:40:010
74711994516,24cyclictest268571-21ssh12:20:290
74711994516,24cyclictest268571-21ssh12:20:290
7471399443,34cyclictest173981-21ssh10:25:332
74713994335,5cyclictest101740-21latency_hist08:40:022
74713994334,6cyclictest85205-21debian-sa107:45:012
7471399432,35cyclictest192398-21ssh10:48:172
74712994334,6cyclictest92721-21systemd-run08:10:011
74711994334,5cyclictest174048-21mailstats10:25:340
74713994234,5cyclictest259664-21aten_r2power_fr12:10:162
74713994230,8cyclictest420-21avahi-daemon09:21:542
7471299421,37cyclictest239765-21ssh11:45:291
74711994231,9cyclictest201567-21munin-run11:00:010
74711994216,21cyclictest210933-21ssh11:10:270
74711994212,26cyclictest124387-21rm09:25:300
74711994212,26cyclictest124387-21rm09:25:300
74713994135,3cyclictest114864-21kworker/u8:0-xprtiod11:40:002
74713994133,5cyclictest104719-21systemd-run08:50:022
74713994131,7cyclictest136030-21aten_r2power_fr09:40:182
74712994133,5cyclictest250933-21idleruntime-cro12:00:011
74712994131,7cyclictest421-21dbus-daemon11:45:011
7471299412,31cyclictest264376-21ssh12:15:271
7471299412,31cyclictest264376-21ssh12:15:271
7471199414,34cyclictest169824-21ssh10:20:340
7471199414,34cyclictest169824-21ssh10:20:340
74711994135,3cyclictest12350irq/32-eth012:10:260
74711994132,6cyclictest420-21avahi-daemon10:45:220
74711994127,11cyclictest185138-21latency_hist10:40:020
74713994034,3cyclictest0-21swapper/210:00:012
74713994031,7cyclictest259221-21sh12:10:022
74712994033,4cyclictest0-21swapper/110:50:161
74712994033,4cyclictest0-21swapper/108:20:011
74712994031,6cyclictest112295-21timerwakeupswit09:10:381
74712994031,5cyclictest135524-21cron09:40:001
74711994031,7cyclictest206707-21needreboot11:05:250
74711994030,7cyclictest0-21swapper/009:20:010
74713993933,3cyclictest0-21swapper/212:20:012
74713993933,3cyclictest0-21swapper/212:20:012
74713993930,5cyclictest185063-21basename10:40:012
74712993932,4cyclictest222863-21fschecks_time11:25:201
74712993932,4cyclictest172725-21kworker/u8:8-xprtiod10:40:011
74712993931,5cyclictest97227-21systemd-run08:25:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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