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2023-06-02 - 20:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #7

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 Pentium G4400 @3300 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of shadow in rack #8, slot #7
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 rack8slot7s.osadl.org (updated Fri Jun 02, 2023 12:43:39)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
146362280,0sleep014639-21grep07:10:270
13886992221,1cyclictest24914-21apt-get10:35:370
13886992221,0cyclictest7917-21apt-get08:20:190
13887992121,0cyclictest0-21swapper/107:30:361
1388699202,17cyclictest1749-21kworker/0:011:17:280
13886992019,1cyclictest20637-21ntp_kernel_pll_11:50:270
13886992019,1cyclictest19983-21apt-get07:25:130
13886992018,1cyclictest23684-21apt-get07:35:150
13886992018,1cyclictest17054-21apt-get08:45:150
1388799190,19cyclictest0-21swapper/109:44:471
1388699198,7cyclictest19761-21munin-run11:50:000
13886991917,1cyclictest30440-21ls07:50:460
13886991917,1cyclictest25511-21apt-get07:40:150
13886991917,1cyclictest17572-21apt-get10:15:160
13886991914,4cyclictest28425-21ls07:45:310
13886991913,5cyclictest6591-21/usr/sbin/munin09:45:170
13886991912,5cyclictest31780-21cstates09:25:200
1388699185,10cyclictest6086-21apt-get08:15:170
13886991817,1cyclictest10412-21fschecks_count09:55:190
13886991816,1cyclictest4620-21lsb_release09:40:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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