You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2019-07-24 - 00:13

Intel(R) Xeon(R) CPU E3-1220L V2 @ 2.30GHz, Linux 4.9.47-rt37 (Profile)

Latency plot of system in rack #a, slot #0
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.
Characteristics of the 20 highest latencies:
System rackaslot0.osadl.org (updated Tue Jul 23, 2019 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1914626543,9sleep10-21swapper/107:09:581
1914526228,19sleep00-21swapper/007:09:570
1882025936,19sleep30-21swapper/307:05:593
69092570,0sleep00-21swapper/009:20:330
1897125431,19sleep20-21swapper/207:07:502
322632530,0sleep31781-21runrttasks12:03:353
322632530,0sleep31781-21runrttasks12:03:353
223442530,0sleep00-21swapper/010:44:420
19393995331,16cyclictest15028-21kworker/3:209:13:143
240312520,0sleep30-21swapper/310:45:003
19393995214,23cyclictest24020-21kworker/3:211:47:003
112352520,1sleep21781-21runrttasks09:33:572
19393995014,30cyclictest2699-21kworker/3:109:30:483
19393994918,24cyclictest0-21swapper/310:54:483
63842470,0sleep20-21swapper/211:32:512
19393994730,17cyclictest39-21ksoftirqd/309:24:383
19393994729,13cyclictest4202-21kworker/3:010:17:203
19393994728,19cyclictest31018-21kworker/3:112:39:223
19393994727,14cyclictest2254-21sshd09:38:203
19393994714,22cyclictest39-21ksoftirqd/311:43:063
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional