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2023-06-04 - 22:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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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x86 Intel Atom E3825 @1333 MHz, Linux 4.9.47-rt37 (Profile)

Latency plot of shadow in rack #9, 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 -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 rack9slot4s.osadl.org (updated Sun Jun 04, 2023 12:59:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
71859912411211,25cyclictest11614-21munin-run07:35:001
70492564518,32sleep00-21swapper/007:24:090
70252563518,30sleep10-21swapper/107:23:561
718499197174,19cyclictest11634-21apt-get07:35:000
584321240,8sleep1718599cyclictest11:35:191
225642860,5sleep122560-21timerwakeupswit08:00:391
83792540,2sleep18378-21cat07:25:371
26092440,4sleep1211ktimersoftd/110:00:291
718499393,10cyclictest81rcu_preempt08:35:020
718499372,22cyclictest18490-21/usr/sbin/munin07:50:320
145522361,31sleep014560-21/usr/sbin/munin07:40:370
718599352,4cyclictest81rcu_preempt08:05:291
718499345,26cyclictest1573-21cron11:25:000
718499345,16cyclictest0-21swapper/011:28:480
718499344,9cyclictest13187-21apt-get11:55:190
718499341,18cyclictest22686-21cron10:55:000
718599335,4cyclictest81rcu_preempt08:18:591
718599335,25cyclictest25069-21diskstats11:00:221
718499336,4cyclictest81rcu_preempt12:30:060
718499333,15cyclictest21211-21apt-get09:25:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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