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2025-07-12 - 11:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.

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 rackeslot4s.osadl.org (updated Sat Jul 12, 2025 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
880759994531,9cyclictest1208400-21apt-get00:25:140
880765994337,4cyclictest1130523-21base6423:10:012
880765994237,3cyclictest1021293-21kworker/u8:1+flush-259:021:50:202
880761994239,2cyclictest1131024-21kworker/u8:3+events_unbound23:10:251
880759994240,1cyclictest932289-21fwupd19:56:560
880765994137,3cyclictest870510-21kworker/u8:0+flush-259:019:20:142
880761994036,2cyclictest1171993-21kworker/u8:5+events_unbound00:10:171
880761993936,2cyclictest953940-21kworker/u8:2+events_unbound20:35:251
880761993936,2cyclictest1083132-21kworker/u8:1+flush-259:022:40:161
880761993935,3cyclictest927392-21kworker/u8:5+flush-259:020:50:161
880765993836,1cyclictest73-1kworker/2:1H+kblockd19:56:572
880761993734,2cyclictest891019-21kworker/u8:1+flush-259:019:35:231
880761993633,2cyclictest1120093-21kworker/u8:2+events_unbound23:00:141
880761993532,2cyclictest1120093-21kworker/u8:2+flush-259:023:05:241
880761993530,3cyclictest927392-21kworker/u8:5+flush-259:022:04:591
880765993429,3cyclictest1182366-21kworker/u8:1+events_unbound00:05:172
880761993430,2cyclictest927392-21kworker/u8:5+events_unbound21:05:221
880761993429,3cyclictest1042067-21kworker/u8:3+flush-259:022:20:251
880761993428,4cyclictest1036944-21/usr/sbin/munin21:40:151
880759993428,4cyclictest1208136-21latency_hist00:25:000
880769993328,3cyclictest1166836-21latency_hist23:45:003
880765993228,3cyclictest1182366-21kworker/u8:1+flush-259:000:30:182
880761993228,3cyclictest927392-21kworker/u8:5+events_unbound21:25:171
880761993227,3cyclictest927638-21apt-get19:55:151
880759993227,4cyclictest1030643-21ntpq21:30:210
880769993127,3cyclictest1203257-21/usr/sbin/munin00:20:143
880769993127,3cyclictest1115149-21/usr/sbin/munin22:55:163
880761993128,2cyclictest1042067-21kworker/u8:3+events_unbound22:35:241
880761993126,3cyclictest1010960-21kworker/u8:0+flush-259:021:15:201
880761993124,5cyclictest3754036-21systemd-journal19:21:581
880765993024,4cyclictest1176299-21ntpq23:50:232
880761993027,2cyclictest1042067-21kworker/u8:3+flush-259:021:45:251
880761993027,2cyclictest1021293-21kworker/u8:1+flush-259:021:55:201
880759993015,13cyclictest969263-21apt-get20:35:000
880765992926,2cyclictest843002-21kworker/u8:2+events_unbound19:15:172
880765992925,3cyclictest1011169-21kworker/u8:2+events_unbound21:40:242
880765992924,3cyclictest1083533-21diskstats22:25:132
880765992923,5cyclictest3754036-21systemd-journal23:35:252
880765992923,4cyclictest1092492-21ntpq22:30:212
880761992926,2cyclictest1161906-21kworker/u8:2+events_unbound23:45:181
880761992926,2cyclictest1104176-21kworker/u8:0+flush-259:023:15:251
880769992822,4cyclictest938006-21/usr/sbin/munin20:05:163
880761992825,2cyclictest1161698-21kworker/u8:0+flush-259:023:40:011
880761992824,3cyclictest912167-21kworker/u8:4+flush-259:019:40:311
880761992824,3cyclictest891019-21kworker/u8:1+flush-259:019:30:151
880761992824,3cyclictest1161906-21kworker/u8:2+events_unbound00:00:191
880759992823,4cyclictest979128-21ntpq20:40:240
880759992823,3cyclictest1182614-21apt-get00:00:130
880759992822,5cyclictest1140230-21ntpq23:15:240
880759992822,4cyclictest1000628-21latency_hist21:05:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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