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2024-07-13 - 20:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 20 highest latencies:
System rack5slot3s.osadl.org (updated Sat Jul 13, 2024 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
306212240165,24sleep30-21swapper/307:08:543
306202239163,24sleep20-21swapper/207:08:532
303792238162,24sleep00-21swapper/007:05:450
304402237163,21sleep10-21swapper/107:06:361
1692621270,2sleep33081999cyclictest09:00:373
30813991081,3cyclictest0-21swapper/211:27:162
209882570,1sleep20-21swapper/211:40:012
261312560,1sleep30-21swapper/310:35:273
318412540,3sleep23081399cyclictest10:50:152
136672500,2sleep10-21swapper/108:55:171
30802993610,13cyclictest2622-21munin-run09:45:020
3080799341,23cyclictest17843-21ntpq11:30:271
3080299348,10cyclictest3945-21grep11:00:160
3080299347,17cyclictest27145-21/usr/sbin/munin10:40:390
30802993411,13cyclictest0-21swapper/012:30:030
3080299336,10cyclictest30936-21cpuspeed_turbos09:35:150
3080299335,13cyclictest7012-21munin-run09:55:020
3080299334,13cyclictest14974-21munin-run12:40:020
30802993312,12cyclictest28873-21diskstats09:30:140
3080299327,16cyclictest16535-21seq11:30:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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