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2022-12-02 - 09:01

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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ARM Broadcom BCM2711 @1500 MHz, Linux 5.10.52-rt47-v7l (Profile)

Latency plot of shadow in rack #7, slot #4
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 -n -a0-2 -p99 -i200 -h400 -t3 -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 rack7slot4s.osadl.org (updated Fri Dec 02, 2022 00:43:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3426997418,31cyclictest12-21ksoftirqd/00
342699688,7cyclictest131rcu_preempt0
341099682,7cyclictest0-21swapper/00
341099662,50cyclictest26463-21ssh0
342699653,29cyclictest0-21swapper/00
3426996510,24cyclictest12-21ksoftirqd/00
342699647,6cyclictest131rcu_preempt0
342699612,5cyclictest131rcu_preempt0
342699562,31cyclictest31236-21ssh0
3426995514,16cyclictest12-21ksoftirqd/00
342699538,22cyclictest12-21ksoftirqd/00
342699532,26cyclictest12-21ksoftirqd/00
341099532,9cyclictest0-21swapper/00
341099524,36cyclictest12-21ksoftirqd/00
341099521,5cyclictest32467-21ssh0
341099520,6cyclictest2436-21ssh0
340399474,23cyclictest22731-21ssh0
342699463,28cyclictest13503-21ssh0
3426994621,6cyclictest0-21swapper/00
340399469,23cyclictest12-21ksoftirqd/00
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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