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2023-02-04 - 19:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #8

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 Atom E3940 @1600 MHz, Linux 5.10.41-rt42 (Profile)

Latency plot of shadow in rack #a, slot #8
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 rackaslot8s.osadl.org (updated Sat Feb 04, 2023 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8924218293,14sleep20-21swapper/207:06:542
1757021760,1sleep20-21swapper/212:18:212
256521630,1sleep00-21swapper/008:05:270
88382159107,28sleep30-21swapper/307:05:473
91072157104,27sleep10-21swapper/107:09:191
90962155101,29sleep00-21swapper/007:09:090
230522770,4sleep123050-21ssh10:00:221
24722590,2sleep0131rcuc/010:10:250
24352520,3sleep10-21swapper/112:05:171
24352520,3sleep10-21swapper/112:05:161
300862500,1sleep30-21swapper/311:03:573
153562490,2sleep00-21swapper/011:19:490
153562490,2sleep00-21swapper/011:19:480
63132480,1sleep20-21swapper/212:08:312
63132480,1sleep20-21swapper/212:08:302
274772430,2sleep20-21swapper/211:30:142
201472430,2sleep334-21ksoftirqd/310:25:533
201472430,2sleep334-21ksoftirqd/310:25:523
49902420,2sleep20-21swapper/210:13:162
201762420,1sleep20-21swapper/211:51:372
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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