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2022-10-04 - 02:51

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, 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 -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
Characteristics of the 20 highest latencies:
System rackdslot2.osadl.org (updated Mon Oct 03, 2022 12:46:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2890121760,7sleep33228099cyclictest11:40:043
554981740,11rtkit-daemon553-21rtkit-daemon07:08:171
133891130108,9phc2sys0-21swapper/307:05:023
31843211089,10sleep00-21swapper/007:08:090
32279997564,5cyclictest33-21ksoftirqd/210:10:162
32279997126,10cyclictest33-21ksoftirqd/210:45:362
286352700,3sleep10-21swapper/108:10:211
32279996929,11cyclictest33-21ksoftirqd/209:50:402
32279996730,7cyclictest33-21ksoftirqd/210:15:312
32279996727,10cyclictest33-21ksoftirqd/208:20:322
32279996654,6cyclictest33-21ksoftirqd/209:15:152
32279996621,8cyclictest33-21ksoftirqd/212:35:372
32279996530,5cyclictest33-21ksoftirqd/212:10:232
32279996530,10cyclictest33-21ksoftirqd/208:25:182
32279996529,7cyclictest33-21ksoftirqd/212:20:192
32279996529,7cyclictest33-21ksoftirqd/207:30:182
32279996529,5cyclictest33-21ksoftirqd/209:33:422
32279996529,11cyclictest33-21ksoftirqd/211:13:262
32279996528,7cyclictest33-21ksoftirqd/209:55:332
32279996528,6cyclictest33-21ksoftirqd/207:25:292
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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