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2024-02-28 - 01:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #6

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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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 rackbslot6s.osadl.org (updated Tue Feb 27, 2024 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32725911870,5ptp4l241ktimersoftd/111:53:371
29692996917,13cyclictest30743-21apt-get15:08:101
284212680,5sleep0111rcuc/015:48:360
29692996513,15cyclictest9970-21needreboot12:23:201
2969299637,18cyclictest20525-21users15:38:371
2969299626,16cyclictest14658-21uname14:43:241
29692996211,17cyclictest31527-21sh16:37:301
2969299617,18cyclictest5071-21grep14:28:081
2969299615,16cyclictest24208-21fschecks_count14:58:201
2969299606,16cyclictest8782-21timerwakeupswit16:48:371
2969299605,16cyclictest15475-21fschecks_time16:58:171
2969299605,15cyclictest24382-21fschecks_count12:58:101
29692996010,16cyclictest5477-21sh16:02:181
2969299596,16cyclictest21166-21rm17:05:031
2969299596,16cyclictest17098-21unixbench_singl13:53:351
2969299595,17cyclictest26840-21apt-get15:48:101
2969299595,17cyclictest21823-21taskset12:53:061
2969299595,15cyclictest4989-21latency_hist15:17:491
2969299595,15cyclictest15254-21latency_hist12:37:471
2969299594,17cyclictest23638-21cat17:08:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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