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2026-05-21 - 00:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackfslot4s.osadl.org (updated Wed May 20, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1680421310,2sleep016805-21seq09:59:280
1190221240,2chrt11899-21ntpq08:10:500
73721210,2chrt736-21/usr/sbin/munin09:35:370
1869321200,3chrt17322-21/usr/sbin/munin08:21:210
1833821200,4chrt18337-21seq10:50:130
1492221200,2chrt14917-21apt-get10:45:110
496721190,2chrt4968-21chrt11:18:310
1808321180,3chrt18081-21ssh11:38:060
1225921180,3chrt12257-21ld09:52:060
651121160,3chrt6512-21runrttasks08:02:020
443321150,2sleep04432-21seq10:29:260
392421150,3chrt3879-21apt-get09:40:160
2162421150,2chrt21623-21seq07:35:210
2317721140,3chrt23178-21runrttasks12:34:470
2466621120,3chrt24664-21nfs4_client12:36:150
1715321120,2chrt17152-21/usr/sbin/munin12:25:350
2525821110,3chrt25259-21ld10:11:340
885921100,2chrt8860-21chrt11:24:510
3002821060,2chrt30029-21awk11:07:150
1260621050,3chrt12607-21sleep09:04:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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