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2023-03-29 - 00:17

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 Tue Mar 28, 2023 12:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
189302221197,16sleep30-21swapper/307:07:203
189392163102,46sleep20-21swapper/207:07:272
191092161108,30sleep10-21swapper/107:09:391
172312161103,29sleep00-21swapper/007:05:040
325392740,4sleep032526-21munin-run12:20:000
251062620,2chrt0-21swapper/012:12:580
192072600,2sleep3331rcuc/312:07:443
192072600,2sleep3331rcuc/312:07:433
84862510,1sleep00-21swapper/009:10:280
323342510,2sleep20-21swapper/210:27:162
323342510,2sleep20-21swapper/210:27:162
269252510,1sleep20-21swapper/212:15:002
122232510,2sleep30-21swapper/311:05:313
117142490,1sleep30-21swapper/311:33:313
58472470,2sleep30-21swapper/310:32:273
237262400,1sleep10-21swapper/112:11:151
212062400,1sleep30-21swapper/309:50:173
195362380,1sleep20-21swapper/211:11:512
19408993617,11cyclictest55250irq/141-enp3s0-10:35:140
100132320,1sleep00-21swapper/011:31:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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