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2026-07-12 - 05:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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: 100 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 rackeslot6s.osadl.org (updated Sun Jul 12, 2026 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
410765199941,69cyclictest0-21swapper/322:45:203
410765199901,58cyclictest0-21swapper/300:15:013
410765199901,58cyclictest0-21swapper/300:15:013
4107648998910,42cyclictest0-21swapper/119:10:181
410765199852,78cyclictest4127586-21http21:05:023
4107645997616,22cyclictest4127579-21apt-get21:05:020
4107649997025,36cyclictest0-21swapper/220:55:302
4107645997062,6cyclictest0-21swapper/000:00:010
4107649996926,37cyclictest0-21swapper/222:55:292
4107649996823,41cyclictest4108366-21grep19:10:292
410764899666,38cyclictest0-21swapper/122:45:211
4107649996516,6cyclictest0-21swapper/221:00:202
410764899658,29cyclictest0-21swapper/122:20:021
4107649996425,34cyclictest0-21swapper/222:25:292
4107649996423,32cyclictest0-21swapper/220:00:012
4107649996354,5cyclictest4141183-21munin-plugin-st22:25:002
4107648996317,21cyclictest0-21swapper/123:55:011
4107649996220,34cyclictest0-21swapper/221:15:332
4107648996221,16cyclictest0-21swapper/121:10:001
410764599627,37cyclictest12-21ksoftirqd/020:50:010
4107649996120,5cyclictest0-21swapper/222:50:292
4107649996028,27cyclictest0-21swapper/223:15:322
4107649996019,6cyclictest0-21swapper/221:45:192
4107649996019,6cyclictest0-21swapper/220:00:312
4107649996018,10cyclictest0-21swapper/222:50:012
4107649995922,9cyclictest1660-21snmpd19:20:182
410764999592,18cyclictest4163995-21grep00:35:312
4107648995937,10cyclictest0-21swapper/120:30:121
4107648995937,10cyclictest0-21swapper/120:30:121
410764899590,36cyclictest0-21swapper/121:05:011
4107649995836,16cyclictest4117261-21kworker/u8:0-ext4-rsv-conversion20:20:012
4107648995834,13cyclictest0-21swapper/120:25:151
410764899581,29cyclictest4122707-21/usr/sbin/munin20:35:191
4107645995847,8cyclictest0-21swapper/022:25:020
4107649995718,34cyclictest0-21swapper/219:35:202
4107648995741,11cyclictest0-21swapper/120:15:121
4107648995737,13cyclictest0-21swapper/122:35:121
4107648995734,9cyclictest0-21swapper/121:55:171
4107645995749,5cyclictest4142863-21munin-plugin-st22:35:010
4107645995749,5cyclictest4142863-21munin-plugin-st22:35:010
4107645995735,12cyclictest14-21rcu_preempt22:15:010
4107649995620,31cyclictest0-21swapper/223:35:002
4107649995615,6cyclictest0-21swapper/222:05:162
4107649995614,36cyclictest274-21systemd-journal20:45:002
4107648995645,9cyclictest0-21swapper/123:40:111
4107648995639,12cyclictest0-21swapper/121:15:171
4107648995638,12cyclictest0-21swapper/100:15:121
4107648995638,12cyclictest0-21swapper/100:15:121
4107648995636,7cyclictest0-21swapper/100:35:141
4107648995636,14cyclictest0-21swapper/123:35:151
4107648995636,14cyclictest0-21swapper/123:35:151
4107649995525,24cyclictest4152167-21grep23:25:292
4107649995519,9cyclictest0-21swapper/221:30:022
4107648995538,12cyclictest0-21swapper/120:40:131
4107648995534,14cyclictest4155332-21/usr/sbin/munin23:45:261
4107648995527,10cyclictest0-21swapper/100:10:121
4107649995419,5cyclictest0-21swapper/220:50:282
4107648995446,3cyclictest4135467-21apt-get21:50:111
4107648995446,3cyclictest4135467-21apt-get21:50:111
4107648995438,11cyclictest0-21swapper/123:30:121
4107648995436,9cyclictest4113691-21tail19:40:271
4107648995436,12cyclictest0-21swapper/122:25:141
4107648995434,12cyclictest4158766-21cut00:05:271
4107648995432,9cyclictest0-21swapper/122:50:131
410764599547,45cyclictest12-21ksoftirqd/000:00:180
410764599546,19cyclictest15-21rcuc/019:15:000
4107649995313,7cyclictest0-21swapper/220:30:302
4107649995313,7cyclictest0-21swapper/220:30:302
410764999531,27cyclictest0-21swapper/220:05:172
4107648995337,10cyclictest4150529-21sshd23:18:331
4107648995337,10cyclictest0-21swapper/119:50:141
4107648995334,13cyclictest4152000-21/usr/sbin/munin23:25:271
4107649995216,8cyclictest0-21swapper/220:35:292
4107648995238,8cyclictest4130771-21/usr/sbin/munin21:20:271
4107648995235,10cyclictest4126382-21/usr/sbin/munin20:55:261
4107648995234,12cyclictest4134926-21/usr/sbin/munin21:45:231
4107648995233,12cyclictest4129030-21/usr/sbin/munin21:10:271
4107648995233,12cyclictest4129030-21/usr/sbin/munin21:10:261
4107648995232,13cyclictest4124642-21/usr/sbin/munin20:45:231
4107648995229,8cyclictest4117261-21kworker/u8:0+flush-179:9620:20:051
4107648995135,12cyclictest4125311-21/usr/sbin/munin20:50:181
4107648995135,10cyclictest0-21swapper/123:00:101
4107648995135,10cyclictest0-21swapper/100:00:141
4107648995134,8cyclictest4156968-21/usr/sbin/munin23:55:261
4107648995134,12cyclictest4133495-21/usr/sbin/munin21:35:281
4107648995134,11cyclictest4148641-21/usr/sbin/munin23:05:281
4107648995134,10cyclictest4138076-21/usr/sbin/munin22:05:191
4107648995133,11cyclictest4144219-21/usr/sbin/munin22:40:251
4107648995132,12cyclictest4115692-21/usr/sbin/munin19:55:161
4107648995131,14cyclictest4137403-21/usr/sbin/munin22:00:231
4107648995131,13cyclictest4117812-21/usr/sbin/munin20:05:231
4107648995131,12cyclictest4138846-21/usr/sbin/munin22:10:141
4107648995131,10cyclictest0-21swapper/121:30:121
4107645995145,4cyclictest0-21swapper/021:30:120
4107645995142,4cyclictest4120834-21munin-plugin-st20:25:010
410764999504,16cyclictest4160131-21cut00:15:192
410764999504,16cyclictest4160131-21cut00:15:182
4107649995013,5cyclictest0-21swapper/221:55:232
4107649995011,10cyclictest0-21swapper/223:20:292
4107648995040,7cyclictest4142519-21/usr/sbin/munin22:30:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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