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2026-05-31 - 00:52

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Sat May 30, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
833822520,2sleep08334-21ps08:25:230
418922070,2sleep04185-21find12:20:250
980621300,3chrt9274-21/usr/sbin/munin08:30:270
1092321240,3chrt10910-21processes08:35:250
1027021210,4chrt10274-21sendmail10:40:000
2094621190,2sleep020949-21sort11:20:190
2249121180,4chrt22492-21mailstats11:25:250
1612021140,4chrt16117-21find08:55:250
1063421130,3chrt10637-21netstat10:40:190
308221090,2sleep03079-21grep08:05:210
291392990,4sleep029208-21/usr/sbin/munin09:45:280
160462880,4sleep016115-21/usr/sbin/munin11:00:270
188122866,66sleep018886-21cat09:05:280
51912845,9sleep05066-21/usr/sbin/munin12:25:170
26882830,3sleep02718-21latency_hist08:05:010
325702780,3sleep032630-21grep07:55:010
225822780,4sleep022624-21/usr/sbin/munin07:15:200
119832764,59sleep011984-21ntp_states10:45:230
1977127318,30sleep019824-21/usr/sbin/munin07:05:120
20974997227,15cyclictest16911-21/usr/sbin/munin11:05:120
15982710,3sleep01601-21mailstats12:10:260
20974996829,17cyclictest13054-21latency_hist08:45:020
281182660,2sleep028116-21vmstat07:35:280
70062613,5sleep00-21swapper08:20:240
2097499617,21cyclictest3384-21sshd10:11:330
20974996129,23cyclictest14933-21runrttasks10:56:030
2097499609,19cyclictest7630-21/usr/sbin/munin12:35:250
2097499609,16cyclictest31226-21/usr/sbin/munin09:55:250
20974996027,22cyclictest19835-21/usr/sbin/munin09:10:200
20974996011,16cyclictest15523-21sshd08:54:320
2097499599,17cyclictest32532-21/usr/sbin/munin10:00:150
20974995916,16cyclictest8096-21ntp_states10:30:190
177292593,9sleep00-21swapper09:01:140
2097499589,17cyclictest22222-21/usr/sbin/munin09:20:120
2097499587,16cyclictest27668-21ntp_states09:40:230
20974995833,17cyclictest4204-21/usr/sbin/munin08:10:150
20974995833,16cyclictest13663-21/usr/sbin/munin08:45:270
20974995831,16cyclictest5674-21/usr/sbin/munin08:15:200
20974995831,16cyclictest26197-21/usr/sbin/munin09:35:170
20974995810,17cyclictest626-21/usr/sbin/munin07:55:260
20974995810,17cyclictest307-21munin-node09:50:110
2097499579,16cyclictest27186-21/usr/sbin/munin11:45:260
2097499579,15cyclictest21263-21/usr/sbin/munin07:10:190
2097499578,16cyclictest24783-21/usr/sbin/munin09:30:260
20974995734,14cyclictest29461-21runrttasks11:53:400
20974995732,16cyclictest23648-21/usr/sbin/munin09:25:170
20974995731,16cyclictest25025-21/usr/sbin/munin07:25:140
20974995711,15cyclictest5773-21/usr/sbin/munin10:20:290
20974995711,14cyclictest20957-21df_inode09:15:150
20974995710,17cyclictest26385-21irqstats07:30:160
20974995710,17cyclictest23767-21/usr/sbin/munin07:20:160
20974995710,16cyclictest19520-21/usr/sbin/munin11:15:140
20974995710,15cyclictest6591-21df_inode10:25:130
2097499567,17cyclictest31349-21ntp_states12:00:190
2097499566,17cyclictest30116-21/usr/sbin/munin07:45:200
20974995633,15cyclictest25985-21/usr/sbin/munin11:40:140
20974995632,15cyclictest1835-21/usr/sbin/munin10:05:270
20974995632,14cyclictest32746-21/usr/sbin/munin12:05:240
20974995631,16cyclictest19375-21latency_hist11:15:020
20974995631,15cyclictest24846-21/usr/sbin/munin11:35:200
2097499559,17cyclictest13261-21ntp_states10:50:230
2097499558,17cyclictest30013-21grep11:55:190
2097499558,14cyclictest4046-21if_eth010:15:160
20974995512,14cyclictest6506-21sort12:30:160
2097499546,17cyclictest23363-21awk11:30:110
20974995431,15cyclictest29225-21/usr/sbin/munin07:40:230
20974995332,14cyclictest2785-21/usr/sbin/munin12:15:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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