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2026-07-11 - 00:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack9slot4s (updated Fri Jul 10, 2026 12:59:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
193552563518,31sleep10-21swapper/107:22:531
193662510462,32sleep00-21swapper/007:23:000
1961399131109,16cyclictest21492-21munin-run07:30:010
34652460,8sleep11961499cyclictest10:55:241
253562371,4sleep12695-21snmpd10:29:101
1961499365,5cyclictest40250irq/92-i91509:15:251
1961399368,15cyclictest0-21swapper/010:49:310
19613993612,5cyclictest11736-21ntp_states08:25:260
1961399353,19cyclictest0-21swapper/009:50:120
19613993510,20cyclictest9313-21df08:20:140
20862341,5sleep12144-21sed08:00:231
1961399349,21cyclictest0-21swapper/010:05:150
1961399343,15cyclictest20968-21python10:15:280
79352331,28sleep17961-21ntp_states08:15:271
244142331,28sleep124495-21df07:35:131
1961399338,10cyclictest23839-21fschecks_time11:50:160
19613993312,8cyclictest26751-21/usr/sbin/munin09:05:240
146212331,28sleep114779-21grep10:00:141
293412321,5sleep10-21swapper/109:12:511
1961399327,6cyclictest0-21swapper/011:40:350
1961399322,17cyclictest12701-21fgrep12:45:270
1961399321,19cyclictest6956-21proc_pri12:30:240
171402321,4sleep117147-21iostat_ios08:40:201
1961499318,5cyclictest40250irq/92-i91512:20:001
1961499315,4cyclictest81rcu_preempt12:49:511
1961499314,11cyclictest2422-21cpuspeed_turbos12:20:121
1961399314,14cyclictest0-21swapper/007:49:250
1961399312,24cyclictest5256-21/usr/sbin/munin08:10:130
19613993121,6cyclictest26142-40update-apt-xapi07:40:000
19613993110,8cyclictest32037-21fschecks_time09:20:160
114782311,5sleep00-21swapper/011:15:430
63102301,5sleep10-21swapper/109:36:531
49842301,5sleep10-21swapper/108:08:571
289762301,10sleep10-21swapper/110:37:491
239622301,5sleep00-21swapper/007:34:310
231462301,5sleep00-21swapper/011:49:290
216322301,5sleep00-21swapper/008:51:000
199982301,5sleep10-21swapper/108:48:301
1961499306,4cyclictest81rcu_preempt10:21:091
1961499305,5cyclictest81rcu_preempt11:30:281
1961499305,4cyclictest81rcu_preempt10:34:151
1961499303,4cyclictest81rcu_preempt12:14:491
19614993022,5cyclictest26255-21/usr/sbin/munin09:05:151
19614993015,9cyclictest4495-21diskstats12:25:161
1961499301,4cyclictest81rcu_preempt10:44:431
1961499301,24cyclictest24571-21fw_packets09:00:171
1961399308,6cyclictest2225-21dbus-daemon09:55:450
1961399303,4cyclictest81rcu_preempt12:54:230
1961399302,17cyclictest0-21swapper/011:10:180
1961399301,4cyclictest81rcu_preempt07:50:400
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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