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2023-02-06 - 13:53

x86 Intel Xeon E5620 @2400 MHz, Linux 4.19.127-rt55 (Profile)

Latency plot of system in rack #c, slot #0
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 -Up99 -i200 -h400 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackcslot0.osadl.org (updated Mon Feb 06, 2023 00:43:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125422200,11sleep10-21swapper/119:19:241
1980621850,6sleep8182799cyclictest00:09:1414
518821090,1sleep6651ktimersoftd/622:25:5612
1215821080,1sleep50-21swapper/500:35:0811
1056210882,18sleep20-21swapper/219:16:458
1009210882,18sleep130-21swapper/1319:16:085
2996221050,1sleep120-21swapper/1200:17:364
1317210285,10sleep110-21swapper/1119:19:353
1311221010,7sleep11183299cyclictest00:27:443
1023121010,0sleep130-21swapper/1323:08:515
1023121010,0sleep130-21swapper/1323:08:515
52221000,2sleep90-21swapper/922:32:4015
2102921000,1sleep20-21swapper/223:34:218
19832990,1sleep120-21swapper/1222:29:314
204992980,1sleep140-21swapper/1423:34:176
183792980,1sleep20-21swapper/221:35:188
243832970,1sleep90-21swapper/921:53:2115
201092970,0sleep60-21swapper/621:28:2512
123029779,11sleep150-21swapper/1519:19:077
173062960,5sleep9182899cyclictest22:51:5615
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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