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2023-03-22 - 04:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 Xeon E3-1220L V2 @2300 MHz, Linux 4.4.229-rt200 (Profile)

Latency plot of shadow in rack #1, 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 -n -a -t3 -p99 -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 rack1slot2s.osadl.org (updated Wed Mar 22, 2023 00:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2680823829,0sleep30-21swapper/318:55:363
2620023623,0sleep00-21swapper/018:51:400
2679623425,0sleep10-21swapper/118:55:261
2647723127,0sleep20-21swapper/218:51:462
8225060,0irq/24-0000:00:21558-21turbostat.cron00:11:132
339960,0migration/36841-21sh21:03:143
339960,0migration/36841-21sh21:03:143
339960,0migration/332164-21sh21:19:153
339960,0migration/312980-21sh23:44:013
339960,0migration/312905-21sh00:25:143
339960,0migration/31236-21sh21:58:043
28855060,0irq/27-eth0-tx-22710-21munin-node20:06:360
269399966,0cyclictest0-21swapper/123:58:531
269399960,0cyclictest23918-21diskmemload22:58:401
269399960,0cyclictest23918-21diskmemload22:44:571
269379963,0cyclictest5571-21munin-run23:01:140
269379960,0cyclictest0-21swapper/020:59:230
149960,0migration/05538-21sh23:40:480
149960,0migration/026581-21sh22:31:440
149960,0migration/025002-21sh21:34:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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