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2019-07-23 - 11:44

Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #c, slot #6
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
The worst-case latency is about 1.09 times higher under extreme CPU load.
Results of all systems under extreme CPU load are combined on this summary graph.
The worst-case latency is about 1.22 times higher under graphics load.
Results of all systems with accelerated graphics are combined on this summary graph.
Characteristics of the 20 highest latencies:
System rackcslot6.osadl.org (updated Tue Jul 23, 2019 00:43:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
328114429388,2sleep20-21swapper/219:05:132
328044027165,3sleep60-21swapper/619:05:096
328231827039,11sleep00-21swapper/019:06:160
328234026140,10sleep40-21swapper/419:06:364
328249925844,10sleep50-21swapper/519:08:455
328238125641,10sleep70-21swapper/719:07:117
328231025641,11sleep10-21swapper/119:06:091
328227425635,10sleep30-21swapper/319:05:383
33870642450,1sleep43387068-21sendmail_mailqu22:10:174
34573722400,0sleep00-21swapper/000:15:090
328286499210,0cyclictest0-21swapper/600:16:336
328284099170,17cyclictest0-21swapper/223:02:322
3282858991616,0cyclictest0-21swapper/523:25:105
3282858991615,1cyclictest57-21ksoftirqd/522:45:125
3282858991615,1cyclictest57-21ksoftirqd/522:45:125
3282858991615,1cyclictest57-21ksoftirqd/522:35:105
3282858991515,0cyclictest57-21ksoftirqd/523:05:175
3282858991515,0cyclictest0-21swapper/500:16:335
328286499140,5cyclictest567-21systemd-journal00:20:486
328286499140,14cyclictest0-21swapper/623:40:076
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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