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2026-09-06 - 18:17

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 Sun Sep 06, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1778821330,5chrt17789-21mailstats08:30:260
832321220,2sleep08322-21processes12:05:250
1194021210,2sleep011939-21idleruntime12:20:140
1520321200,3sleep015202-21users10:25:270
968121160,2sleep09684-21mailstats12:10:250
435921160,3sleep04358-21tr11:50:200
326921070,3sleep03268-21tr09:40:200
53121007,14sleep0599-21ps11:35:250
1265321000,3sleep012713-21cat08:10:270
150462990,3sleep015073-21/usr/sbin/munin08:20:210
96152956,13sleep09665-21df08:00:110
9322950,2sleep0934-21timerandwakeup09:30:280
84942890,4sleep08511-21/usr/sbin/munin07:55:190
82982856,65sleep08323-21latency10:00:180
18212840,4sleep01850-21awk11:40:260
144732836,62sleep014508-21cut10:25:000
289732805,61sleep029025-21df09:15:120
34072740,3sleep03408-21ntpq07:35:210
2790827320,31sleep027914-21df_inode07:05:110
55282690,3sleep05527-21latency_hist09:50:020
301892654,50sleep0288-21snmpd07:14:040
2905599629,17cyclictest1979-21ntp_states09:35:240
2905599619,18cyclictest31122-21sshd07:16:070
29055996136,16cyclictest22596-21/usr/sbin/munin08:50:140
29055996121,14cyclictest6079-21seq11:56:200
29055996032,16cyclictest16086-21/usr/sbin/munin10:30:180
29055996030,21cyclictest18957-21/usr/sbin/munin08:35:260
29055996020,13cyclictest27834-21/usr/sbin/munin09:10:170
29055996010,16cyclictest17764-21users10:35:300
2905599599,17cyclictest28680-21munin-run11:20:000
2905599598,17cyclictest24935-21/usr/sbin/munin11:05:270
2905599597,19cyclictest30300-21/usr/sbin/munin09:20:140
2905599597,18cyclictest10904-21/usr/sbin/munin08:05:240
29055995934,16cyclictest23881-21/usr/sbin/munin08:55:160
29055995924,13cyclictest1023-21sendmail_mailtr07:25:260
29055995910,19cyclictest2005-21irqstats07:30:150
2905599589,15cyclictest30103-21/usr/sbin/munin11:25:180
2905599578,15cyclictest26217-21/usr/sbin/munin11:10:140
2905599577,17cyclictest11719-21modprobe12:20:010
29055995733,15cyclictest22597-21/usr/sbin/munin10:55:200
29055995732,15cyclictest20600-21runrttasks10:47:220
29055995732,15cyclictest20023-21/usr/sbin/munin08:40:140
29055995731,17cyclictest11313-21/usr/sbin/munin10:10:300
29055995731,16cyclictest23903-21/usr/sbin/munin11:00:210
29055995710,15cyclictest16915-21date12:40:020
2905599569,16cyclictest5740-21/usr/sbin/munin07:45:110
2905599568,17cyclictest13522-21chrt08:15:110
2905599568,15cyclictest2802-21/usr/sbin/munin11:45:180
2905599567,16cyclictest28822-21/usr/sbin/munin11:20:160
2905599567,15cyclictest21050-21/usr/sbin/munin10:50:110
2905599567,14cyclictest12007-21/usr/sbin/munin10:15:150
29055995631,16cyclictest32072-21runrttasks11:31:080
29055995631,16cyclictest16139-21/usr/sbin/munin08:25:140
29055995613,12cyclictest31761-21/usr/sbin/munin07:20:260
29055995611,15cyclictest26154-21sshd09:04:070
29055995610,15cyclictest5049-21users07:40:290
2905599559,15cyclictest21292-21df_inode08:45:130
2905599558,15cyclictest31576-21/usr/sbin/munin09:25:130
2905599558,14cyclictest6987-21irqstats09:55:160
2905599558,14cyclictest6680-21/usr/sbin/munin12:00:150
2905599558,14cyclictest13569-21mailstats12:25:260
29055995510,17cyclictest8178-21sh07:55:000
2905599548,15cyclictest14419-21/usr/sbin/munin12:30:140
29055995432,13cyclictest19019-21/usr/sbin/munin10:40:280
29055995431,14cyclictest26689-21ntp_states09:05:230
29055995430,16cyclictest6526-21runrttasks09:53:290
29055995410,16cyclictest9571-21/usr/sbin/munin10:05:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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