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2025-04-03 - 15:43

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Thu Apr 03, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35359032226173,42sleep00-21swapper/007:05:410
35361392223186,24sleep40-21swapper/407:09:064
35361882222162,48sleep50-21swapper/507:09:475
35361812220162,19sleep70-21swapper/707:09:407
35360842216183,21sleep60-21swapper/607:08:206
35361282214162,16sleep20-21swapper/207:08:552
35359872207175,21sleep10-21swapper/107:06:531
35359152206179,17sleep30-21swapper/307:05:513
353667099260,22cyclictest0-21swapper/709:10:197
3536660992620,5cyclictest0-21swapper/508:55:015
353666099260,22cyclictest3684431-21apt-get12:10:085
353665599250,24cyclictest0-21swapper/410:10:094
353667099240,23cyclictest3696705-21sh12:35:007
353666499240,23cyclictest3639290-21awk10:30:016
353666099240,0cyclictest0-21swapper/509:20:135
353665199240,23cyclictest3619867-21munin-run09:45:003
353665199240,0cyclictest0-21swapper/307:15:143
3536644992422,1cyclictest3580214-21latency_hist08:25:002
3536641992423,1cyclictest0-21swapper/107:15:001
3536641992421,2cyclictest3667482-21sh11:30:001
353664199240,23cyclictest0-21swapper/112:15:001
3536635992422,1cyclictest0-21swapper/007:15:000
3536670992321,2cyclictest0-21swapper/710:20:127
3536670992319,3cyclictest3539433-21munin-run07:14:597
353667099230,23cyclictest0-21swapper/710:30:177
353667099230,22cyclictest0-21swapper/707:55:157
353667099230,22cyclictest0-21swapper/707:45:147
3536664992321,1cyclictest3539438-21perf07:15:006
3536660992321,1cyclictest2278910-21systemd-journal12:34:595
353666099230,22cyclictest3617004-21perf09:40:005
3536655992321,2cyclictest3648600-21awk10:50:004
353665599230,23cyclictest3617035-21awk09:40:004
3536651992321,1cyclictest3629929-21munin-run10:10:013
353665199230,22cyclictest650-21dbus-daemon11:20:003
353665199230,22cyclictest3610538-21idleruntime-cro09:25:013
353665199230,22cyclictest0-21swapper/309:00:123
353665199230,1cyclictest3569165-21apt-get08:05:113
3536644992319,3cyclictest3654546-21turbostat.cron11:00:002
353664499230,22cyclictest0-21swapper/212:20:122
3536641992321,1cyclictest0-21swapper/107:39:591
353664199230,22cyclictest0-21swapper/109:55:011
353664199230,22cyclictest0-21swapper/109:55:011
353664199230,22cyclictest0-21swapper/108:50:081
3536635992323,0cyclictest0-21swapper/012:15:010
3536635992321,1cyclictest3692850-21apt-get12:25:000
3536635992321,1cyclictest3673631-21apt-get11:40:140
3536635992321,1cyclictest3642536-21apt-get10:35:090
3536635992321,1cyclictest0-21swapper/011:00:000
3536635992320,2cyclictest3648582-21dump-pmu-power10:50:010
353663599230,22cyclictest3623470-21awk09:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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