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2025-07-01 - 05:27

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 Tue Jul 01, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1998821250,3chrt18899-21/usr/sbin/munin22:36:220
2415221220,2chrt24151-21/usr/sbin/munin21:46:100
1804421210,2chrt18040-21ntpq00:31:200
1447821170,2chrt14481-21wc20:26:270
3176821150,2sleep031769-21cat23:56:000
358821130,2chrt3589-21sleep22:07:140
2792921090,3chrt27930-21sleep20:54:310
2182621070,2chrt21827-21sh23:37:270
603129112,60sleep06032-21ntpq19:06:080
92332810,1sleep09236-21wc22:17:180
235312800,2sleep023532-21/usr/sbin/munin23:41:070
7435907714,54cyclictest30080-21ssh22:55:170
743590767,20cyclictest30637-21diskstats19:55:330
743590765,21cyclictest13142-21munin-run22:25:020
743590757,10cyclictest21743-21ntpq20:41:060
161252750,2sleep016123-21swap23:27:140
743590746,17cyclictest22995-21sleep21:44:240
743590746,11cyclictest7836-21cpuspeed19:10:270
743590745,20cyclictest335-21memory22:01:140
743590745,19cyclictest28795-21munin-run21:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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