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2026-07-10 - 18:50

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Fri Jul 10, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
786222830,3sleep07864-21tr07:15:270
2939221450,2sleep029391-21wc10:45:170
2444021240,3chrt24438-21memory08:20:190
242221240,4chrt2421-21/usr/sbin/munin11:05:260
881721200,3chrt8815-21df_inode07:20:130
835521180,3chrt8354-21sed11:30:010
329021130,3chrt3292-21latency_hist09:05:010
51392990,4sleep05143-21ntp_states07:05:200
219552970,2sleep021953-21open_files08:10:270
255132950,3sleep025527-21open_files12:35:230
273182940,3sleep027392-21grep08:30:310
202422880,3sleep020274-21netstat12:15:200
322092860,4sleep032247-21ntpq08:50:200
239552770,2sleep023956-21munin-plugin-st10:25:000
74472765,57sleep07487-21memory09:20:180
317122756,58sleep0288-21snmpd08:48:550
7952710,2sleep0796-21/usr/sbin/munin08:55:120
6054996620,14cyclictest288-21snmpd12:09:370
605499619,18cyclictest285-21sshd10:53:230
6054996114,19cyclictest6032-21df09:15:130
6054996033,17cyclictest18948-21/usr/sbin/munin12:10:160
605499598,17cyclictest5527-21seq09:12:230
605499598,17cyclictest4507-21/usr/sbin/munin11:15:100
6054995910,17cyclictest13108-21seq11:47:000
6054995910,16cyclictest11086-21df11:40:120
605499589,21cyclictest21473-21/usr/sbin/munin10:15:250
605499589,17cyclictest9965-21ntp_states11:35:210
605499589,16cyclictest11383-21df_inode07:30:140
6054995834,16cyclictest6443-21ntp_states07:10:220
6054995834,15cyclictest14231-21/usr/sbin/munin07:40:240
6054995810,16cyclictest6908-21sshd11:24:250
6054995810,14cyclictest32090-21ntp_states10:55:240
605499579,17cyclictest29673-21ntpq08:40:200
605499579,15cyclictest8397-21/usr/sbin/munin11:30:280
605499578,16cyclictest25859-21open_inodes08:25:260
6054995734,14cyclictest3920-21/usr/sbin/munin09:05:280
6054995734,14cyclictest20471-21/usr/sbin/munin10:10:210
6054995733,16cyclictest23665-21runrttasks08:16:320
6054995733,15cyclictest24470-21/usr/sbin/munin10:25:240
6054995732,16cyclictest21230-21runrttasks08:07:390
6054995713,13cyclictest26641-21cpu10:35:110
6054995711,18cyclictest21723-21processes12:20:230
6054995710,15cyclictest946-21ntpd09:35:200
605499569,17cyclictest17823-21df_inode07:55:140
605499569,16cyclictest17615-21/usr/sbin/munin10:00:140
605499568,15cyclictest3415-21memory11:10:180
6054995634,14cyclictest24074-21/usr/sbin/munin12:30:130
6054995634,14cyclictest18962-21/usr/sbin/munin10:05:110
6054995634,14cyclictest15481-21/usr/sbin/munin11:55:290
6054995632,15cyclictest15560-21/usr/sbin/munin09:50:290
6054995610,17cyclictest8846-21ntpq09:25:220
9152550,4sleep0916-21ntpq11:00:180
605499557,15cyclictest145482chrt09:47:090
6054995531,16cyclictest17410-21latency_hist12:05:000
6054995530,16cyclictest15612-21/usr/sbin/munin07:45:270
6054995528,15cyclictest28001-21/usr/sbin/munin10:40:100
605499549,14cyclictest16479-21/usr/sbin/munin07:50:170
605499548,15cyclictest19333-21ntpq08:00:190
605499548,15cyclictest10092-21seq07:25:140
605499548,14cyclictest9864-21/usr/sbin/munin09:30:260
605499548,13cyclictest12806-21ps09:40:250
605499547,15cyclictest13600-21/usr/sbin/munin11:50:280
6054995432,15cyclictest23614-21runrttasks12:28:270
6054995430,16cyclictest28150-21runrttasks08:35:120
6054995429,16cyclictest13664-21runrttasks07:39:170
605499538,15cyclictest25402-21grep10:30:100
6054995329,15cyclictest16635-21/usr/sbin/munin09:55:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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