You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2022-05-26 - 19:59

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 Mar 07, 2022 12:46:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
616623150,4sleep20-21swapper/207:05:262
7670999683,7cyclictest25-21ksoftirqd/107:25:181
723029676,9sleep30-21swapper/307:08:033
70852765,18sleep10-21swapper/107:06:111
297532760,3sleep10-21swapper/107:35:191
72672752,18sleep00-21swapper/007:08:320
211752730,3sleep00-21swapper/012:05:140
7670997158,8cyclictest25-21ksoftirqd/108:50:191
260242660,3sleep10-21swapper/109:30:211
260242660,3sleep10-21swapper/109:30:211
7669996427,7cyclictest9-21ksoftirqd/011:20:000
7670996146,7cyclictest25-21ksoftirqd/109:35:191
7669996125,5cyclictest9-21ksoftirqd/012:15:140
766999597,10cyclictest9-21ksoftirqd/011:45:080
7669995928,5cyclictest9-21ksoftirqd/007:15:120
7669995927,5cyclictest9-21ksoftirqd/010:50:130
7669995927,5cyclictest9-21ksoftirqd/010:50:130
7669995925,10cyclictest9-21ksoftirqd/008:50:220
7670995849,4cyclictest25-21ksoftirqd/108:40:191
7670995843,8cyclictest25-21ksoftirqd/109:05:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional