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2021-04-12 - 09:11

AMD Eng Sample: ZM277192H4468_36/27/15/06_130C, Linux 4.9.47-rt37 (Profile)

Latency plot of system in rack #4, slot #1
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 rack4slot1.osadl.org (updated Wed Jul 22, 2020 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
170002258118,93sleep20-21swapper/218:21:012
166982226118,97sleep30-21swapper/318:17:213
166532153118,26sleep00-21swapper/018:16:460
167992151119,23sleep10-21swapper/118:18:231
1148321110,2sleep30-21swapper/321:32:493
2252421070,2sleep01726099cyclictest18:31:250
312292920,2sleep20-21swapper/218:51:232
286812890,2sleep10-21swapper/123:34:221
296022880,2sleep10-21swapper/121:51:441
17260998073,5cyclictest942-21snmpd21:18:220
29512790,1sleep10-21swapper/123:41:231
17279997975,2cyclictest0-21swapper/319:43:013
1727099790,76cyclictest23996-21cat21:46:282
17279997874,2cyclictest18487-21ssh20:31:353
17279997874,2cyclictest18487-21ssh20:31:353
17279997874,2cyclictest0-21swapper/323:48:593
17260997872,1cyclictest942-21snmpd19:33:040
17260997865,7cyclictest942-21snmpd18:53:180
17260997865,7cyclictest942-21snmpd18:53:180
17279997774,2cyclictest0-21swapper/322:31:423
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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