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2021-10-17 - 14:15

Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz, Linux 5.10.17-rt32 (Profile)

Latency plot of system in rack #0, slot #5
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 rack0slot5.osadl.org (updated Sun Oct 17, 2021 00:43:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2651299436436,0cyclictest1325-21snmpd21:22:3311
2651299412412,0cyclictest0-21swapper/520:54:4611
260912404393,6sleep110-21swapper/1119:05:173
260912404393,6sleep110-21swapper/1119:05:173
2655399394393,1cyclictest122611-21kworker/u32:521:06:477
2655399393392,1cyclictest0-21swapper/1522:30:347
2655399393392,1cyclictest0-21swapper/1521:20:337
2655399392392,0cyclictest0-21swapper/1523:55:067
2655399392392,0cyclictest0-21swapper/1523:46:487
2655399392392,0cyclictest0-21swapper/1523:27:377
2655399392392,0cyclictest0-21swapper/1523:04:487
2655399392392,0cyclictest0-21swapper/1522:42:147
2655399392392,0cyclictest0-21swapper/1522:16:037
2655399392392,0cyclictest0-21swapper/1521:28:487
2655399392392,0cyclictest0-21swapper/1521:26:027
2655399392392,0cyclictest0-21swapper/1519:32:567
2655399392391,1cyclictest0-21swapper/1523:14:227
2655399392391,1cyclictest0-21swapper/1522:50:067
2655399391391,0cyclictest0-21swapper/1522:34:147
2655399391391,0cyclictest0-21swapper/1522:07:347
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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