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2019-07-24 - 00:25

Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, Linux 4.16.15-rt7 (Profile)

Latency plot of system in rack #c, 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 -Up99 -i200 -h400 --smi -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 1.40 times 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 rackcslot0.osadl.org (updated Tue Jul 23, 2019 12:43:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2593921780,5sleep03226499cyclictest12:24:570
660921300,0sleep20-21swapper/211:07:088
660921300,0sleep20-21swapper/211:07:088
317492128103,21sleep60-21swapper/607:08:0412
317492128103,21sleep60-21swapper/607:08:0412
801521270,1sleep1231rcuc/109:50:201
235921240,1sleep40-21swapper/412:30:0610
31835212292,26sleep100-21swapper/1007:09:132
31835212292,26sleep100-21swapper/1007:09:132
1434221220,3sleep133228399cyclictest11:37:175
2199621210,6sleep103228099cyclictest11:55:102
2441221200,7sleep83227799cyclictest09:32:3214
737421190,5sleep143228699cyclictest09:22:446
318222117104,8sleep140-21swapper/1407:09:006
318222117104,8sleep140-21swapper/1407:09:006
2703721160,0sleep10-21swapper/110:04:471
1927621150,1sleep80-21swapper/811:21:0914
1927621150,1sleep80-21swapper/811:21:0914
894021140,1sleep130-21swapper/1309:34:455
1173121140,1sleep50-21swapper/511:40:5411
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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