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2026-01-12 - 14:37

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackfslot4s.osadl.org (updated Mon Jan 12, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2488221370,2sleep024883-21seq23:29:140
1804921280,3chrt18035-21ntp_states21:42:080
3177321190,2chrt31774-21runrttasks20:21:390
2139421190,2sleep021395-21sh23:23:500
3164521170,3chrt31643-21ntpq22:02:210
1867921170,3chrt18676-21ntpq20:00:530
2654521140,2chrt26544-21/usr/sbin/munin21:05:480
2597821140,2chrt25976-21ld22:41:360
1096421140,1sleep010965-21runrttasks22:20:100
337821130,2chrt3379-21seq00:33:300
515621100,3chrt5155-21sshd21:22:450
374621100,2chrt3747-21collect222:57:070
2797121090,3chrt27972-21sleep22:45:200
2512321090,1sleep025125-21processes00:17:150
2049621090,2chrt20494-21sshd19:12:550
1156821090,2chrt11569-21sleep20:41:300
1731221080,3chrt17313-21runrttasks22:29:240
875321070,2chrt8754-21sleep20:37:010
760721070,1sleep07608-21runrttasks22:15:090
2617621070,1sleep026177-21runrttasks21:54:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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