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2025-12-04 - 20:22

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 Thu Dec 04, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2747322450,2sleep027476-21mailstats10:50:270
3012021600,4chrt29721-21/usr/sbin/munin08:55:280
2061221410,3chrt20426-21/usr/sbin/munin12:30:190
2174121300,3chrt21744-21latency_hist10:30:010
1961621220,3sleep019614-21swap12:25:290
1681821130,3sleep016762-21/usr/sbin/munin08:05:150
671621100,2sleep06718-21ls11:35:280
80862980,4sleep08144-21grep09:35:310
180502920,2sleep018051-21/usr/sbin/munin10:15:150
112212900,4sleep011248-21wc11:55:000
324822870,4sleep032486-21sshd11:10:250
150827820,31sleep01514-21ntp_states07:05:210
142872770,3sleep014348-21ntp_kernel_pll_10:00:190
219212750,3sleep021922-21/usr/sbin/munin10:30:140
2437996630,27cyclictest28376-21/usr/sbin/munin10:55:160
19082643,6sleep00-21swapper11:17:490
2437996329,25cyclictest9320-21/usr/sbin/munin09:40:250
2437996234,16cyclictest4098-21/usr/sbin/munin07:15:230
2437996221,15cyclictest16622-21cron08:05:000
2437996210,16cyclictest2443-21/usr/sbin/munin09:15:250
243799618,17cyclictest16672-21/usr/sbin/munin10:10:270
2437996036,15cyclictest11581-21/usr/sbin/munin09:50:160
243799599,18cyclictest10601-21ntpq07:40:250
2437995934,15cyclictest2338-21/usr/sbin/munin11:20:150
2437995934,14cyclictest11663-21/usr/sbin/munin07:45:130
2437995933,16cyclictest22344-21/usr/sbin/munin08:25:250
2437995929,17cyclictest31321-21ntp_states09:00:250
2437995912,17cyclictest11545-21memory11:55:190
2437995910,17cyclictest5385-21/usr/sbin/munin11:30:290
188192593,8sleep00-21swapper08:11:510
243799589,17cyclictest8988-21/usr/sbin/munin07:35:280
243799589,15cyclictest13955-21munin-run10:00:010
243799588,16cyclictest5141-21/usr/sbin/munin07:20:260
243799587,19cyclictest15247-21/usr/sbin/munin12:10:310
2437995835,14cyclictest6682-21/usr/sbin/munin07:25:200
2437995810,16cyclictest3748-21/usr/sbin/munin11:25:160
2437995810,16cyclictest21722-21sshd08:24:210
2437995810,14cyclictest5049-21munin-node09:25:130
243799579,18cyclictest25867-21/usr/sbin/munin08:40:330
243799579,17cyclictest3762-21/usr/sbin/munin09:20:280
243799579,16cyclictest16531-21/usr/sbin/munin12:15:200
243799579,15cyclictest7503-21/usr/sbin/munin11:40:180
243799578,17cyclictest30351-21sshd11:01:310
243799578,17cyclictest1575-21chrt09:10:270
243799578,17cyclictest10213-21/usr/sbin/munin09:45:150
243799578,15cyclictest6334-21/usr/sbin/munin09:30:290
243799578,15cyclictest23526-21grep08:30:200
2437995710,18cyclictest24445-21/usr/sbin/munin10:40:190
95292563,5sleep00-21swapper11:46:380
243799569,15cyclictest24832-21ntp_states08:35:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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