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2022-05-23 - 03:58

x86 Intel Xeon E3-1220L V2 @2300 MHz, Linux 4.4.229-rt200 (Profile)

Latency plot of system in rack #1, slot #2
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 -n -a -t3 -p99 -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 rack1slot2.osadl.org (updated Mon May 23, 2022 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
932123827,0sleep30-21swapper/318:55:543
942123525,0sleep20-21swapper/218:57:052
917723425,0sleep10-21swapper/118:54:151
943423127,0sleep00-21swapper/018:57:150
95379988,0cyclictest3346-21snmpd22:33:580
95389975,0cyclictest0-21swapper/119:07:391
95379970,0cyclictest0-21swapper/022:59:080
329970,0watchdog/319329-21ssh23:49:403
95399960,0cyclictest0-21swapper/219:52:542
95389960,0cyclictest0-21swapper/122:14:091
339960,0migration/331942-21if_eth020:42:533
339960,0migration/329070-21sh22:46:293
339960,0migration/328367-21sh21:36:253
339960,0migration/324311-21sh23:00:543
339960,0migration/322121-21sh21:13:203
339960,0migration/315745-21sh23:31:573
339960,0migration/310065-21sh00:20:063
28005060,0irq/28-eth0-rx-3115-21pmu-power21:38:063
28005060,0irq/28-eth0-rx-29509-21cut21:52:553
28005060,0irq/28-eth0-rx-29509-21cut21:52:553
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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