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2025-12-13 - 19:59

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 Fri Dec 12, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
368821180,2chrt3689-21sh20:54:390
2054321170,2chrt20009-21/usr/sbin/munin21:25:550
1512221170,2chrt15118-21aten2.4-expect00:11:190
1902921140,3chrt19030-21sleep22:20:540
2369721110,2chrt23698-21sleep23:27:170
1772821050,2chrt17729-21sleep22:18:150
126321050,2chrt1261-21/usr/sbin/munin23:45:560
1090521040,2chrt10906-21sleep00:02:440
736121000,2chrt7362-21sleep19:56:440
111062990,3chrt11107-21sh21:08:550
101672990,3chrt10168-21sh20:02:480
241672920,2sleep024168-21cat21:31:540
70042880,2sleep07002-21sendmail_mailtr22:57:150
255692860,2sleep025574-21cut23:31:020
136132737,53sleep013623-21ntpq19:05:390
126032700,2sleep012606-21wc21:11:200
211842680,2sleep021185-21sort20:25:030
240852593,8sleep024094-21ntpq19:25:560
144612584,43sleep014521-21memory20:10:490
285052563,42sleep028565-21perl19:35:350
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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