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2026-06-29 - 04:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot6s.osadl.org (updated Mon Jun 29, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2392322600,2sleep023925-21mailstats21:55:260
337522400,2sleep03377-21uptime20:35:280
3130121610,2sleep031302-21latency_hist20:20:010
253721450,2sleep02538-21sh22:40:000
1209521180,4chrt12096-21processes23:15:260
3003321160,2sleep030032-21sort20:15:020
3255521130,2sleep032556-21modprobe20:24:590
2749921070,3sleep027527-21irqstats22:10:160
141742925,11sleep014203-21ls23:25:010
288172880,4sleep028864-21grep00:20:240
159132877,12sleep015961-21df19:20:130
314152820,3sleep031273-21/usr/sbin/munin22:25:180
221812797,58sleep022220-21memory23:55:180
108392786,61sleep010843-21ntp_states21:05:230
265082760,3sleep026567-21basename22:05:280
310142750,2sleep031011-21cat00:30:010
1206427521,30sleep012075-21/usr/sbin/munin19:05:140
263502710,2sleep026351-21cat20:00:150
13201996824,16cyclictest26097-21sendmail20:00:000
258642660,3sleep025862-21grep00:10:020
94512640,2sleep09450-21open_files23:05:240
13201996330,23cyclictest26486-21/usr/sbin/munin00:10:290
1320199629,20cyclictest2950-21ntpq22:40:200
13201996119,11cyclictest0-21swapper20:05:190
1320199608,17cyclictest29987-21/usr/sbin/munin22:20:310
13201996035,15cyclictest17181-21/usr/sbin/munin21:30:180
13201996034,17cyclictest31676-21/usr/sbin/munin00:30:280
13201996034,16cyclictest19538-21/usr/sbin/munin23:45:140
13201996010,17cyclictest1-21systemd19:13:260
1320199598,17cyclictest14452-21/usr/sbin/munin21:20:220
1320199598,16cyclictest32370-21/usr/sbin/munin00:35:260
13201995934,15cyclictest20930-21runrttasks19:40:000
13201995912,16cyclictest18701-21awk23:40:270
1320199589,14cyclictest491-21/usr/sbin/munin20:25:210
13201995832,16cyclictest6616-21/usr/sbin/munin22:55:130
13201995832,16cyclictest1023-21runrttasks22:33:110
13201995831,17cyclictest23898-21/usr/sbin/munin19:50:210
13201995831,17cyclictest14452-21/usr/sbin/munin23:25:160
13201995820,16cyclictest10017-21runrttasks21:01:420
13201995820,14cyclictest13109-21runrttasks21:15:020
1320199579,18cyclictest21160-21sshd23:50:260
1320199579,17cyclictest18472-21/usr/sbin/munin19:30:150
1320199579,16cyclictest25142-21/usr/sbin/munin22:00:250
1320199578,18cyclictest17290-21/usr/sbin/munin23:35:280
1320199578,17cyclictest5251-21/usr/sbin/munin22:50:290
1320199578,17cyclictest4436-21grep22:45:260
1320199578,15cyclictest28670-21/usr/sbin/munin22:15:150
1320199577,17cyclictest6667-21/usr/sbin/munin20:50:120
13201995734,15cyclictest20174-21/usr/sbin/munin21:40:290
13201995734,15cyclictest1697-21/usr/sbin/munin20:30:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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