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2019-07-24 - 00:27

Intel(R) Core(TM) i7 CPU X 990 @ 3.47GHz, Linux 4.9.47-rt37 (Profile)

Latency plot of system in rack #c, 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
The worst-case latency is NOT 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 1.84 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 rackcslot1.osadl.org (updated Tue Jul 23, 2019 12:48:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4335991410,132rtkit-daemon0-21swapper/207:09:344
16924210089,7sleep110-21swapper/1107:05:073
433599900,85rtkit-daemon0-21swapper/807:05:2910
1745327158,6sleep30-21swapper/307:05:105
1838226858,7sleep50-21swapper/507:06:257
1845726545,6sleep00-21swapper/007:07:330
1829026455,6sleep90-21swapper/907:05:1711
1862126052,6sleep40-21swapper/407:09:496
1859725850,6sleep60-21swapper/607:09:268
1842625748,7sleep100-21swapper/1007:07:062
1836925546,7sleep70-21swapper/707:06:159
1836325546,7sleep10-21swapper/107:06:091
1904799325,19cyclictest0-21swapper/011:20:000
1904799276,15cyclictest0-21swapper/008:10:000
1908799264,16cyclictest0-21swapper/712:30:009
1905399266,14cyclictest0-21swapper/111:20:011
1905399266,14cyclictest0-21swapper/111:20:001
1910699254,14cyclictest0-21swapper/1011:20:002
1910699254,14cyclictest0-21swapper/1011:20:002
19098992521,3cyclictest0-21swapper/910:15:0011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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