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2026-08-25 - 14:02

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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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 50 highest latencies:
System rackeslot6s.osadl.org (updated Tue Aug 25, 2026 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
92453399945,21cyclictest972035-21apt-get23:55:021
92453399945,21cyclictest972035-21apt-get23:55:021
924532998981,6cyclictest0-21swapper/023:40:020
92453399589,7cyclictest928155-21apt-get19:30:011
92453299562,47cyclictest0-21swapper/020:10:020
92453599552,23cyclictest0-21swapper/221:50:022
924535995343,6cyclictest927211-21grep19:20:292
92453599526,17cyclictest0-21swapper/219:45:002
92453599521,42cyclictest0-21swapper/221:00:012
92453599521,42cyclictest0-21swapper/221:00:012
92453399515,15cyclictest14-21rcu_preempt00:20:011
92453599501,25cyclictest0-21swapper/222:15:022
92453599501,25cyclictest0-21swapper/222:15:022
924533995043,4cyclictest938473-21munin-plugin-st20:30:011
924533995042,5cyclictest972039-21munin-plugin-st23:55:001
924532995042,5cyclictest969722-21grep23:30:280
924535994937,9cyclictest926473-21sendmail19:20:002
924533994933,12cyclictest231ktimers/121:45:181
924533994930,12cyclictest0-21swapper/100:10:311
924532994941,4cyclictest167350irq/118-8000000.ethernet-tx020:10:160
924532994941,4cyclictest0-21swapper/019:10:010
924532994925,20cyclictest20650irq/252-8000000.ethernet22:30:300
924532994841,4cyclictest167350irq/118-8000000.ethernet-tx019:34:590
924532994832,12cyclictest946920-21sendmail21:20:000
924532994824,20cyclictest20650irq/252-8000000.ethernet20:15:010
92453299481,10cyclictest0-21swapper/000:10:010
924533994736,6cyclictest933190-21grep19:55:291
924533994733,8cyclictest231ktimers/123:25:151
924532994740,4cyclictest131ktimers/019:25:010
924535994631,11cyclictest0-21swapper/220:25:002
92453599461,24cyclictest0-21swapper/222:40:002
924532994639,4cyclictest20650irq/252-8000000.ethernet22:05:310
924532994638,4cyclictest167350irq/118-8000000.ethernet-tx022:10:220
924532994638,4cyclictest167350irq/118-8000000.ethernet-tx022:10:220
924532994631,8cyclictest972886-21grep23:57:150
924532994631,8cyclictest972886-21grep23:57:150
924532994624,16cyclictest15-21rcuc/021:05:000
92453599451,30cyclictest0-21swapper/220:20:022
924533994530,9cyclictest0-21swapper/119:15:011
924532994539,3cyclictest167350irq/118-8000000.ethernet-tx023:40:300
924532994538,4cyclictest167350irq/118-8000000.ethernet-tx019:25:240
924532994536,6cyclictest933257-21unixbench_singl19:55:300
92453299451,42cyclictest0-21swapper/019:45:190
92453299451,41cyclictest0-21swapper/021:05:220
924532994437,3cyclictest0-21swapper/000:30:230
92453299443,5cyclictest953359-21/usr/sbin/munin21:55:240
924532994429,13cyclictest167350irq/118-8000000.ethernet-tx020:20:150
924532994426,10cyclictest0-21swapper/021:40:290
924533994327,11cyclictest0-21swapper/123:10:291
924532994336,4cyclictest167350irq/118-8000000.ethernet-tx023:15:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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