You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2021-10-24 - 02:25

Intel(R) Xeon(R) CPU E3-1578L v5 @ 2.00GHz, Linux 4.19.1-rt3 (Profile)

Latency plot of system in rack #5, slot #3
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 rack5slot3.osadl.org (updated Sun Oct 24, 2021 00:50:04)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27855992218,3cyclictest5076-21ptp4l21:20:216
27852992222,0cyclictest0-21swapper/323:14:583
27851992222,0cyclictest0-21swapper/222:00:042
27851992219,3cyclictest1639-21lldpd21:59:442
27850992119,2cyclictest0-21swapper/123:19:561
27849992010,0cyclictest0-21swapper/000:11:550
27854991919,0cyclictest0-21swapper/523:27:065
27853991814,1cyclictest5965-21nscd00:16:024
27849991818,0cyclictest0-21swapper/022:33:400
27849991810,0cyclictest0-21swapper/021:55:290
27855991716,1cyclictest10216-21ssh00:05:136
27853991713,4cyclictest24056-21sh22:02:204
27850991710,7cyclictest0-21swapper/121:25:211
27850991710,7cyclictest0-21swapper/100:02:111
27849991710,7cyclictest0-21swapper/023:47:550
27849991710,3cyclictest0-21swapper/021:19:590
27862991615,1cyclictest23484-21ssh00:12:187
27862991614,1cyclictest671-21nscd00:37:347
27862991610,6cyclictest0-21swapper/720:06:287
27862991610,6cyclictest0-21swapper/720:06:287
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional