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2023-01-31 - 05:02

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 
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x86 Intel Core i7-4960X @3600 MHz, Linux 6.0.12-100.fc35.x86_64 (Profile)

Latency plot of shadow in rack #0, slot #4
Note that this system runs a non-RT kernel.
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
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 rack0slot4s.osadl.org (updated Fri Oct 21, 2022 00:45:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37928742378358,12sleep140-21swapper/1419:06:096
37931512363326,12sleep40-21swapper/419:09:2710
37931402363326,12sleep110-21swapper/1119:09:183
37931722355329,21sleep70-21swapper/719:09:4613
37929052355335,12sleep60-21swapper/619:06:3212
37931472354333,13sleep10-21swapper/119:09:241
37931192354345,5sleep100-21swapper/1019:09:012
37928942354333,13sleep150-21swapper/1519:06:267
37929602352333,12sleep20-21swapper/219:07:178
37931062350330,12sleep50-21swapper/519:08:5611
37930602350330,12sleep90-21swapper/919:08:2915
37929112350330,12sleep120-21swapper/1219:06:384
37930062349328,12sleep80-21swapper/819:07:5514
37928572347327,13sleep30-21swapper/319:05:589
37929122344324,12sleep130-21swapper/1319:06:405
37930722340320,13sleep00-21swapper/019:08:360
3793653994118,13cyclictest1941-21/usr/sbin/httpd22:52:463
379365399316,0cyclictest3968422-21ssh22:08:503
3793622993118,1cyclictest0-21swapper/222:40:248
3793622993015,0cyclictest141rcu_preempt00:07:248
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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