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2026-07-04 - 23:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 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 rack4slot6s.osadl.org (updated Sat Jul 04, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1077922550,2sleep010780-21wc09:55:110
1385022490,3sleep013851-21awk10:05:270
1863422410,2sleep018633-21sort08:20:020
2451122370,2sleep024512-21sshd08:40:430
1506022280,2sleep015057-21grep10:10:250
2387121450,3sleep023870-21wc10:45:180
2285721140,2sleep022856-21sendmail_mailtr10:40:270
92421120,3chrt925-21awk07:10:250
229821090,2sleep02355-21users09:20:290
1765921080,3sleep017658-21wc10:20:250
3095821020,4sleep0285-21sshd09:05:430
1658121020,2sleep016584-21cut08:10:260
749521000,4sleep07513-21users09:40:280
126532920,3sleep012719-21switchtime07:55:280
175212915,10sleep017587-21/usr/sbin/munin12:25:290
71752900,4sleep07232-21switchtime11:45:270
190002827,63sleep019006-21ntp_states08:20:220
46627520,31sleep0492-21munin-run07:10:010
35732756,57sleep03636-21which07:20:250
45102745,57sleep04557-21cpu07:25:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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