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2025-11-27 - 13:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Thu Nov 27, 2025 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6996332920,5chrt0-21swapper/321:21:193
8895142600,3sleep00-21swapper/000:36:150
573235995746,8cyclictest873144-21ntpq00:16:210
573240995647,6cyclictest649580-21latency_hist20:25:011
573235995342,8cyclictest838578-21ntpq23:41:190
573240995147,3cyclictest563296-21kworker/u8:3+flush-8:021:31:241
7975802500,2sleep1291ktimers/123:01:171
573240995046,3cyclictest685875-21kworker/u8:4+flush-8:021:11:261
573240995045,4cyclictest720549-21kworker/u8:1+flush-8:021:51:251
573240994843,4cyclictest531737-21kworker/u8:2+flush-8:019:46:241
573240994841,5cyclictest765253-21kworker/u8:2+flush-8:023:21:201
573242994722,8cyclictest735539-21cat22:00:012
573240994743,3cyclictest563296-21kworker/u8:3+flush-8:021:06:131
573240994742,4cyclictest661155-21kworker/u8:1+flush-8:020:51:231
573240994740,5cyclictest809758-21kworker/u8:0+events_unbound00:36:241
573235994741,4cyclictest563296-21kworker/u8:3+flush-8:020:51:120
573240994639,5cyclictest854510-21kworker/u8:1+flush-8:000:11:221
573240994638,6cyclictest720632-21apt-get21:46:071
573240994540,4cyclictest715569-21kworker/u8:0+events_unbound22:01:161
573240994540,4cyclictest531737-21kworker/u8:2+flush-8:019:56:271
573240994539,4cyclictest715569-21kworker/u8:0+flush-8:022:21:211
573235994540,4cyclictest720549-21kworker/u8:1+flush-8:021:56:240
573235994538,5cyclictest282-21systemd-journal23:56:150
573235994537,6cyclictest573073-21kworker/u8:1+flush-8:020:11:140
573235994436,6cyclictest282-21systemd-journal21:10:000
573235994435,7cyclictest705452-21latency_hist21:30:010
573235994435,6cyclictest755463-21/usr/sbin/munin22:21:200
573240994338,3cyclictest765253-21kworker/u8:2+events_unbound23:46:201
573240994338,3cyclictest715569-21kworker/u8:0+flush-8:022:11:241
573240994337,5cyclictest720549-21kworker/u8:1+flush-8:022:31:271
573240994337,4cyclictest765253-21kworker/u8:2+events_unbound23:31:271
573240994337,4cyclictest765253-21kworker/u8:2+events_unbound23:31:271
573240994336,5cyclictest720549-21kworker/u8:1+flush-8:022:46:241
573235994332,8cyclictest805420-21diskstats23:11:110
573240994237,3cyclictest715569-21kworker/u8:0+events_unbound22:06:231
573240994234,3cyclictest715569-21kworker/u8:0+events_unbound22:26:151
573240994228,5cyclictest809758-21kworker/u8:0+events_unbound23:51:291
573235994233,7cyclictest879591-21diskstats00:26:150
573242994127,3cyclictest815082-21aten2_r5power_c23:21:092
573242994118,8cyclictest609240-21ntpq19:41:212
573240994136,3cyclictest790032-21kworker/u8:3+flush-8:023:11:171
573240994135,4cyclictest573073-21kworker/u8:1+events_unbound20:20:001
573235994132,7cyclictest690956-21/usr/sbin/munin21:16:180
573235994130,8cyclictest584178-21ntpq19:16:210
573242994031,7cyclictest282-21systemd-journal21:30:012
573240994035,3cyclictest720549-21kworker/u8:1+events_unbound21:56:271
573235994036,3cyclictest765253-21kworker/u8:2+flush-8:023:46:150
573235994035,4cyclictest715569-21kworker/u8:0+flush-8:022:11:260
573235994032,5cyclictest615006-21latency_hist19:50:010
573240993934,4cyclictest573073-21kworker/u8:1+flush-8:020:11:291
573240993934,3cyclictest809758-21kworker/u8:0+events_unbound23:20:011
573240993927,8cyclictest282-21systemd-journal23:36:141
573235993932,5cyclictest282-21systemd-journal22:42:540
573240993834,3cyclictest563296-21kworker/u8:3+flush-8:019:31:161
573240993833,4cyclictest715569-21kworker/u8:0+flush-8:022:16:231
573235993833,3cyclictest720549-21kworker/u8:1+flush-8:021:46:230
573240993733,3cyclictest563296-21kworker/u8:3+flush-8:020:56:241
573240993733,3cyclictest531737-21kworker/u8:2+events_unbound19:16:261
573240993732,3cyclictest765253-21kworker/u8:2+events_unbound22:36:231
573240993729,6cyclictest700519-21latency_hist21:25:011
573240993729,5cyclictest794749-21latency_hist23:00:011
573235993733,3cyclictest685874-21kworker/u8:0+flush-8:021:21:240
573235993729,6cyclictest282-21systemd-journal20:05:000
573240993631,4cyclictest531737-21kworker/u8:2+events_unbound19:41:201
573240993631,3cyclictest765253-21kworker/u8:2+flush-8:023:41:161
573240993630,5cyclictest661155-21kworker/u8:1+flush-8:021:01:221
573235993632,3cyclictest531737-21kworker/u8:2+flush-8:020:06:250
573235993629,5cyclictest563296-21kworker/u8:3+events_unbound20:56:200
573235993627,6cyclictest282-21systemd-journal23:21:140
573240993531,2cyclictest602398-21kthreadcore19:36:181
573240993530,4cyclictest685874-21kworker/u8:0+events_unbound21:16:251
573240993530,3cyclictest563296-21kworker/u8:3+flush-8:019:21:261
573240993529,4cyclictest819967-21apt-get23:26:101
573240993529,4cyclictest765253-21kworker/u8:2+flush-8:000:20:311
573240993528,5cyclictest790032-21kworker/u8:3+flush-8:023:06:201
573240993527,6cyclictest765253-21kworker/u8:2+flush-8:000:06:201
573235993527,6cyclictest858385-21ntpq00:01:220
573240993430,3cyclictest854510-21kworker/u8:1+events_unbound00:01:261
573240993430,3cyclictest809758-21kworker/u8:0+flush-8:000:31:271
573240993430,2cyclictest712866-21kthreadcore21:36:161
573240993429,3cyclictest563296-21kworker/u8:3+events_unbound21:41:091
573240993429,3cyclictest531737-21kworker/u8:2+events_unbound19:11:151
573240993428,4cyclictest685875-21kworker/u8:4+events_unbound21:26:201
573240993426,6cyclictest282-21systemd-journal00:15:251
573240993425,6cyclictest619938-21latency_hist19:55:011
573235993428,4cyclictest720549-21kworker/u8:1+flush-8:022:06:180
573235993428,4cyclictest655744-21latency_hist20:40:000
573235993428,4cyclictest655744-21latency_hist20:40:000
573235993427,5cyclictest719417-21ntpq21:41:190
573235993424,8cyclictest282-21systemd-journal19:55:000
573235993422,10cyclictest715332-21systemctl21:40:000
573242993326,5cyclictest805029-21cp23:10:012
573242993323,8cyclictest844344-21cat23:50:012
573240993329,3cyclictest874276-21kworker/u8:3+events_unbound00:26:201
573240993327,4cyclictest531737-21kworker/u8:2+flush-8:019:26:211
573235993327,4cyclictest854510-21kworker/u8:1+flush-8:000:11:160
573235993323,8cyclictest282-21systemd-journal22:05:000
573240993228,2cyclictest563296-21kworker/u8:3+events_unbound20:31:101
573240993227,4cyclictest765253-21kworker/u8:2+flush-8:023:56:251
573240993226,5cyclictest563296-21kworker/u8:3+flush-8:020:46:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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