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2026-08-14 - 14:29

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 Fri Aug 14, 2026 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3829528997322,25cyclictest3846297-21/usr/sbin/munin20:45:211
3829528997217,30cyclictest0-21swapper/120:05:011
3829528997120,27cyclictest0-21swapper/119:20:001
382952899673,15cyclictest3845458-21/usr/sbin/munin20:40:181
382952899673,15cyclictest3845458-21/usr/sbin/munin20:40:181
382952899641,37cyclictest0-21swapper/123:00:011
3829530996254,4cyclictest3881827-21munin-plugin-st00:15:002
382952899621,31cyclictest0-21swapper/123:45:011
3829530996145,11cyclictest0-21swapper/219:35:012
3829530996118,9cyclictest3848837-21/usr/sbin/munin21:00:172
3829530995734,18cyclictest311ktimers/222:30:012
3829528995730,15cyclictest0-21swapper/122:20:151
3829528995730,15cyclictest0-21swapper/122:20:151
3829528995631,14cyclictest0-21swapper/100:25:151
3829528995615,33cyclictest3875897-21sshd23:39:261
3829528995615,33cyclictest3875897-21sshd23:39:261
382952899555,11cyclictest0-21swapper/121:25:011
382952899555,11cyclictest0-21swapper/121:25:001
3829528995332,13cyclictest0-21swapper/119:45:131
3829528995316,31cyclictest0-21swapper/121:25:251
3829528995314,36cyclictest0-21swapper/119:10:011
3829528995235,11cyclictest3841993-21apt-get20:20:161
3829528995233,13cyclictest0-21swapper/120:30:121
3829528995134,9cyclictest3843024-21ssh20:25:211
3829528995134,9cyclictest3843024-21ssh20:25:211
3829528995125,13cyclictest0-21swapper/120:15:151
3829528995031,9cyclictest3845126-21grep20:35:281
3829528995030,11cyclictest0-21swapper/119:50:291
3829527995019,28cyclictest14-21rcu_preempt20:40:280
3829527995019,28cyclictest14-21rcu_preempt20:40:280
3829528994935,9cyclictest3880346-21apt-get00:05:191
3829528994931,12cyclictest0-21swapper/122:40:121
3829528994929,13cyclictest0-21swapper/100:30:151
3829528994929,13cyclictest0-21swapper/100:30:141
3829528994831,10cyclictest3857515-21dropbear21:50:191
3829528994829,7cyclictest0-21swapper/122:05:301
3829528994823,16cyclictest3869897-21tail23:00:281
3829528994821,19cyclictest3874147-21grep23:25:291
3829528994819,18cyclictest3848504-21grep20:55:271
382952799484,8cyclictest0-21swapper/021:15:020
3829527994838,7cyclictest3871689-21munin-plugin-st23:15:000
3829528994728,13cyclictest0-21swapper/123:15:141
3829528994726,10cyclictest0-21swapper/122:15:141
3829528994726,10cyclictest0-21swapper/119:30:121
3829528994721,13cyclictest0-21swapper/123:30:121
3829528994719,18cyclictest3881706-21grep00:10:281
382952799478,28cyclictest14-21rcu_preempt20:25:010
3829527994743,2cyclictest0-21swapper/019:35:110
3829527994743,2cyclictest0-21swapper/019:35:110
3829527994731,7cyclictest3882603-21grep00:15:320
3829527994731,7cyclictest3882603-21grep00:15:320
3829528994635,6cyclictest3880091-21grep00:00:321
3829528994633,6cyclictest0-21swapper/119:25:291
3829528994629,11cyclictest3882272-21/usr/sbin/munin00:15:231
3829528994629,11cyclictest3882272-21/usr/sbin/munin00:15:231
3829528994628,11cyclictest0-21swapper/120:50:121
3829528994627,14cyclictest0-21swapper/122:50:141
3829528994627,11cyclictest3829884-21grep19:10:201
3829527994639,5cyclictest3836623-21grep19:50:000
3829527994633,8cyclictest0-21swapper/021:50:320
3829528994535,7cyclictest3835141-21/usr/sbin/munin19:40:111
3829528994533,8cyclictest3871638-21grep23:10:301
3829528994531,9cyclictest3855685-21apt-get21:40:161
3829528994529,10cyclictest0-21swapper/122:10:121
3829528994529,10cyclictest0-21swapper/122:10:121
3829528994528,9cyclictest3840551-21phc2sys-jitter20:10:261
3829528994522,14cyclictest3885509-21munin-node00:35:121
3829527994514,3cyclictest0-21swapper/021:20:280
3829527994514,3cyclictest0-21swapper/021:20:280
382952799451,42cyclictest0-21swapper/000:10:110
3829530994428,10cyclictest0-21swapper/223:30:292
3829528994436,4cyclictest3837736-21/usr/sbin/munin19:55:171
3829528994435,4cyclictest3870209-21/usr/sbin/munin23:05:301
3829528994434,7cyclictest3851134-21sshd21:11:201
3829528994433,7cyclictest3865053-21apt-get22:35:151
3829528994431,7cyclictest3864291-21/usr/sbin/munin22:30:191
3829528994428,9cyclictest3877287-21/usr/sbin/munin23:45:281
3829528994427,9cyclictest3834448-21lsblk19:35:211
3829528994427,9cyclictest3834448-21lsblk19:35:211
3829528994425,9cyclictest3848906-21/usr/sbin/munin21:00:151
3829528994424,12cyclictest3850017-21/usr/sbin/munin21:05:271
382952799444,36cyclictest0-21swapper/000:30:210
382952799444,36cyclictest0-21swapper/000:30:210
3829527994437,4cyclictest20650irq/252-8000000.ethernet00:00:330
3829527994435,5cyclictest0-21swapper/020:20:000
3829527994431,8cyclictest0-21swapper/019:40:280
3829527994428,12cyclictest0-21swapper/022:25:280
3829528994329,9cyclictest3863993-21sshd22:27:261
3829528994325,11cyclictest3854952-21/usr/sbin/munin21:35:211
3829528994325,11cyclictest3854952-21/usr/sbin/munin21:35:211
3829528994323,8cyclictest3872750-21/usr/sbin/munin23:20:111
3829527994335,4cyclictest0-21swapper/020:00:120
382952799432,5cyclictest3832781-21irqstats19:25:230
382952799431,39cyclictest3840491-21kernelversion20:10:230
3829528994235,4cyclictest3858296-21apt-get21:55:141
3829528994232,8cyclictest3853694-21apt-get21:30:041
3829528994229,11cyclictest3839431-21/usr/sbin/munin20:05:151
3829528994228,7cyclictest3882887-21apt-get00:20:151
3829528994226,11cyclictest3866836-21munin-node22:45:121
3829528994225,12cyclictest3851461-21/usr/sbin/munin21:15:201
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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