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2026-04-22 - 21:49

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 Wed Apr 22, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15451699541,44cyclictest30-21rcuc/209:05:012
15451699541,36cyclictest0-21swapper/209:20:012
154514995410,28cyclictest22-21rcuc/107:45:011
154514995410,28cyclictest22-21rcuc/107:45:011
154512995414,3cyclictest180952-21memory09:40:240
154512995243,5cyclictest167350irq/118-8000000.ethernet-tx010:50:160
15451699516,11cyclictest191424-21apt-get10:45:022
154512995144,4cyclictest184690-21latency_hist10:05:010
154512995144,4cyclictest167350irq/118-8000000.ethernet-tx007:20:180
154512995143,4cyclictest167350irq/118-8000000.ethernet-tx008:45:240
154512995119,5cyclictest205727-21/usr/sbin/munin12:05:260
154514995042,5cyclictest190582-21munin-plugin-st10:40:001
154512995043,4cyclictest194038-21munin-plugin-st11:00:000
154512995042,4cyclictest167350irq/118-8000000.ethernet-tx008:00:290
154514994937,9cyclictest177056-21run-parts09:20:001
15451299497,39cyclictest208790-21sh12:25:190
15451499488,12cyclictest14-21rcu_preempt12:20:001
154514994836,8cyclictest0-21swapper/110:20:011
15451499482,20cyclictest22-21rcuc/111:20:011
154512994837,6cyclictest0-21swapper/009:20:250
154512994830,15cyclictest167350irq/118-8000000.ethernet-tx008:55:180
15451299482,44cyclictest0-21swapper/012:10:250
15451299482,44cyclictest0-21swapper/012:10:250
15451299482,22cyclictest0-21swapper/007:15:010
15451499472,15cyclictest0-21swapper/111:35:011
15451499472,15cyclictest0-21swapper/111:35:011
154512994740,5cyclictest170214-21munin-plugin-st08:40:000
154512994740,4cyclictest167350irq/118-8000000.ethernet-tx010:35:280
154512994735,8cyclictest156654-21grep07:20:010
154516994633,7cyclictest0-21swapper/207:15:012
154516994632,9cyclictest0-21swapper/207:40:272
154516994632,9cyclictest0-21swapper/207:40:262
15451299465,8cyclictest0-21swapper/009:05:010
154516994532,8cyclictest0-21swapper/211:25:282
154516994530,7cyclictest0-21swapper/210:20:202
154514994534,8cyclictest194037-21run-parts11:00:001
154514994531,9cyclictest0-21swapper/109:45:001
154512994538,4cyclictest167350irq/118-8000000.ethernet-tx009:50:230
154512994536,4cyclictest202572-21munin-plugin-st11:50:000
15451299452,5cyclictest196071-21df11:10:150
154512994523,19cyclictest20650irq/252-8000000.ethernet09:10:240
154512994517,3cyclictest186610-21df10:15:160
154516994438,4cyclictest311ktimers/210:15:112
154516994434,4cyclictest0-21swapper/211:05:012
154514994430,8cyclictest0-21swapper/110:10:261
154514994417,17cyclictest231ktimers/111:20:111
154512994438,3cyclictest167350irq/118-8000000.ethernet-tx008:40:170
154512994437,4cyclictest167350irq/118-8000000.ethernet-tx010:25:270
15451699433,22cyclictest0-21swapper/211:15:012
154516994327,12cyclictest0-21swapper/210:15:012
154516994323,11cyclictest0-21swapper/209:55:192
154514994326,11cyclictest231ktimers/108:30:171
15451299437,7cyclictest176960-21grep09:15:290
15451299435,7cyclictest0-21swapper/012:40:010
15451299433,5cyclictest164578-21diskstats08:05:170
154512994335,5cyclictest199760-21proc_pri11:30:260
154512994335,5cyclictest199760-21proc_pri11:30:260
154512994310,8cyclictest194887-21apt-get11:05:030
154516994230,6cyclictest157347-21grep07:20:292
15451499426,4cyclictest0-21swapper/112:05:011
154514994232,6cyclictest0-21swapper/109:20:261
15451299424,6cyclictest189856-21cat10:35:010
154512994235,4cyclictest167350irq/118-8000000.ethernet-tx010:40:150
154512994232,6cyclictest19750irq/27-20000000.i2c11:20:280
154516994132,5cyclictest0-21swapper/210:45:162
154516994125,6cyclictest0-21swapper/211:10:202
154514994133,4cyclictest0-21swapper/111:10:001
154514994127,10cyclictest1283-21cron12:35:001
154514994124,10cyclictest0-21swapper/108:00:201
154514994119,11cyclictest191524-21cat10:45:011
154516994025,8cyclictest204196-21grep11:55:292
154516994023,10cyclictest0-21swapper/212:20:272
154516994011,24cyclictest0-21swapper/211:30:222
154516994011,24cyclictest0-21swapper/211:30:222
15451499408,21cyclictest22-21rcuc/112:05:101
154514994021,12cyclictest231ktimers/108:25:161
154512994033,4cyclictest20650irq/252-8000000.ethernet07:45:160
154512994033,4cyclictest20650irq/252-8000000.ethernet07:35:100
154512994032,4cyclictest0-21swapper/008:15:270
154512994032,4cyclictest0-21swapper/008:15:270
154512994028,6cyclictest185447-21grep10:05:280
154512994027,10cyclictest0-21swapper/010:10:250
15451299401,37cyclictest160273-21diskstats07:40:170
15451299401,37cyclictest160273-21diskstats07:40:170
15451699399,24cyclictest2-21kthreadd07:58:232
154516993936,2cyclictest0-21swapper/208:25:012
154516993910,18cyclictest172000-21cmp08:50:012
15451499393,3cyclictest0-21swapper/107:20:011
154514993930,5cyclictest201734-21munin-plugin-st11:45:001
154514993928,5cyclictest0-21swapper/111:50:281
154514993927,7cyclictest0-21swapper/108:55:291
154514993925,7cyclictest14-21rcu_preempt11:10:281
154514993923,9cyclictest0-21swapper/112:40:001
15451299398,4cyclictest162138-21/usr/sbin/munin07:50:210
154512993933,4cyclictest0-21swapper/012:30:200
154512993933,3cyclictest0-21swapper/009:30:010
154512993929,7cyclictest187942-21grep10:20:280
154512993925,9cyclictest183753-21grep09:55:290
15451299391,36cyclictest0-21swapper/012:00:220
15451299391,36cyclictest0-21swapper/011:00:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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