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2026-07-30 - 19:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 100 highest latencies:
System rack5slot3s.osadl.org (updated Thu Jul 30, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
87832238165,24sleep20-21swapper/207:07:252
87252234163,58sleep10-21swapper/107:06:401
87492204169,23sleep00-21swapper/007:07:000
86922204167,25sleep30-21swapper/307:06:153
1745921560,5sleep3908699cyclictest12:20:143
9081998683,2cyclictest0-21swapper/211:22:002
9081997668,7cyclictest0-21swapper/209:21:542
67332750,2sleep10-21swapper/108:15:151
156802500,4sleep121-21rcuc/109:50:021
907199478,11cyclictest0-21swapper/009:55:010
907199461,13cyclictest30994-21munin-run10:25:000
907199461,13cyclictest30994-21munin-run10:25:000
312202460,2sleep30-21swapper/309:10:193
312202460,2sleep30-21swapper/309:10:193
907199436,12cyclictest20638-21perf11:15:010
908699411,29cyclictest9622-21perf10:50:023
9081994138,2cyclictest0-21swapper/208:11:422
908699403,24cyclictest31417-21cstates10:25:103
908699398,22cyclictest18646-21/usr/sbin/munin11:10:163
908699391,30cyclictest19303-21/usr/sbin/munin12:25:153
908699391,24cyclictest27534-21cpuspeed_turbos11:30:123
908699391,24cyclictest27534-21cpuspeed_turbos11:30:123
908699384,17cyclictest12050irq/123-ahci[0009:45:013
908699381,24cyclictest3918-21/usr/sbin/munin11:50:183
908699379,20cyclictest9267-21/usr/sbin/munin07:10:103
908699371,26cyclictest14406-21irqstats09:45:203
908699371,25cyclictest6700-21latency_hist09:30:013
908699370,29cyclictest0-21swapper/310:55:133
907199379,14cyclictest15563-21munin-run09:50:020
908699361,26cyclictest14971-21/usr/sbin/munin08:35:143
908699361,24cyclictest30131-21diskmemload11:41:513
908699361,24cyclictest0-21swapper/310:05:183
908699361,21cyclictest1533-21latency_hist08:05:013
908699361,21cyclictest1533-21latency_hist08:05:013
908699355,23cyclictest0-21swapper/311:05:243
908699351,31cyclictest29737-21/usr/sbin/munin07:55:183
908699351,21cyclictest25342-21/usr/sbin/munin07:45:243
908699345,21cyclictest7110-21missed_timers08:15:183
908699345,20cyclictest87350irq/126-enp1s0-11:25:233
908699341,23cyclictest7578-21unixbench-2d11:55:243
908699341,21cyclictest29355-21df10:20:123
908699341,21cyclictest29355-21df10:20:123
908699341,21cyclictest22256-21expr11:15:243
908699341,20cyclictest4383-21kworker/u8:009:30:213
908699341,20cyclictest1781-21/usr/sbin/munin08:05:233
908699331,18cyclictest11120-21seq09:39:413
908699330,21cyclictest0-21swapper/308:30:253
907199334,13cyclictest23526-21idleruntime-cro08:55:000
908699325,16cyclictest87350irq/126-enp1s0-12:35:123
908699322,26cyclictest27167-21diskstats10:15:123
908699321,24cyclictest16413-21gltestperf09:50:153
908699321,24cyclictest14981-21cat11:00:163
908699321,22cyclictest21567-21sshd08:50:123
908699321,18cyclictest87650irq/129-enp1s0-10:30:263
908699321,18cyclictest4636-21latency_hist09:25:023
908699321,18cyclictest0-21swapper/310:35:233
908699321,15cyclictest0-21swapper/310:10:123
908699320,23cyclictest0-21swapper/310:50:133
9071993219,5cyclictest14677-21kworker/0:112:17:090
908699313,17cyclictest774-21avahi-daemon10:01:063
908699312,25cyclictest15620-21smart_sda07:20:243
908699311,27cyclictest29631-21/usr/sbin/munin11:35:183
908699311,26cyclictest20632-21smart_sda08:45:263
908699311,17cyclictest19992-21latency_hist10:00:003
908699311,17cyclictest17394-21expr08:40:143
9086993110,18cyclictest12673-21latency_hist12:10:013
908699310,20cyclictest0-21swapper/312:15:013
908699310,20cyclictest0-21swapper/309:15:173
908699310,17cyclictest25654-21sshd08:59:133
907199312,11cyclictest13799-21kworker/0:311:05:140
9071993112,7cyclictest16847-21kworker/0:008:42:570
9071993112,3cyclictest3567-21kworker/0:108:12:250
908699302,25cyclictest13424-21smart_sda07:15:233
908699302,18cyclictest87650irq/129-enp1s0-07:30:123
908699301,26cyclictest6545-21/usr/sbin/munin10:40:203
908699301,26cyclictest20946-21/usr/sbin/munin07:35:143
908699301,17cyclictest22755-21/usr/sbin/munin12:30:243
9086993010,17cyclictest10915-21df_inode08:25:123
9081993015,3cyclictest0-21swapper/212:05:002
9071993018,4cyclictest21011-21kworker/0:109:01:140
9071993017,3cyclictest18976-21kworker/0:207:35:220
219152300,5sleep0907199cyclictest11:15:210
908699298,18cyclictest27540-21acpi07:50:093
908699291,25cyclictest9128-21irqstats12:00:183
908699291,25cyclictest8372-21/usr/sbin/munin08:20:133
908699291,25cyclictest5242-21smart_sda08:10:233
908699291,25cyclictest28164-21/usr/sbin/munin09:05:243
908699291,25cyclictest25953-21/usr/sbin/munin09:00:173
908699291,25cyclictest2338-21/usr/sbin/munin11:45:133
908699291,25cyclictest23140-21/usr/sbin/munin07:40:243
908699291,25cyclictest23039-21/usr/sbin/munin11:20:103
908699291,25cyclictest17624-21/usr/sbin/munin07:25:213
908699291,25cyclictest15095-21cstates12:15:123
9071992912,9cyclictest14677-21kworker/0:112:29:050
907199286,9cyclictest6640-21kworker/0:208:29:250
907199285,2cyclictest14072-21kworker/0:107:27:410
9071992812,8cyclictest29208-21kworker/0:007:54:220
907199273,5cyclictest29208-21kworker/0:007:59:540
9071992712,8cyclictest29208-21kworker/0:008:02:100
9071992712,8cyclictest29208-21kworker/0:008:02:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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