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2026-06-23 - 21:21

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 Tue Jun 23, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
280402239166,21sleep20-21swapper/207:09:112
280492204166,25sleep10-21swapper/107:09:191
279112203167,23sleep30-21swapper/307:07:353
277712199162,25sleep00-21swapper/007:05:440
3140121830,4sleep32820899cyclictest09:40:213
2820199104101,2cyclictest0-21swapper/209:54:432
28201999389,3cyclictest0-21swapper/209:23:282
167022600,4sleep30-21swapper/311:35:153
77032540,2sleep20-21swapper/210:00:192
315672520,1sleep20-21swapper/207:15:132
265052520,5sleep126508-21unixbench_multi11:55:231
9932510,2sleep20-21swapper/209:45:182
283982490,2sleep00-21swapper/009:35:130
260662480,2sleep10-21swapper/109:30:121
317612470,2sleep20-21swapper/208:30:022
296992470,2sleep00-21swapper/012:05:140
2820899442,32cyclictest23104-21/usr/sbin/munin08:10:243
28201993917,3cyclictest0-21swapper/210:38:182
28201993917,3cyclictest0-21swapper/210:38:182
2820899385,4cyclictest12050irq/123-ahci[0009:05:013
2820899385,3cyclictest87650irq/129-enp1s0-10:50:233
2820899371,6cyclictest20293-21/usr/sbin/munin10:30:153
28208993712,22cyclictest32512-21/usr/sbin/munin09:45:143
2820899364,5cyclictest22785-40dnf08:09:053
2820899361,3cyclictest194622cpuspeed_turbos09:15:123
2820899361,10cyclictest7706-21/usr/sbin/munin07:35:163
2820899359,3cyclictest25301-21/usr/sbin/munin08:15:113
2820899355,3cyclictest87650irq/129-enp1s0-11:40:233
2820899351,7cyclictest3749-21cpuspeed_turbos12:20:153
2820899351,6cyclictest24042-21expr09:25:143
2820899351,6cyclictest24042-21expr09:25:143
2819199359,12cyclictest26308-21munin-run10:45:000
100472350,1sleep10-21swapper/107:40:121
2820899349,3cyclictest16498-21/usr/sbin/munin07:55:233
2820899344,3cyclictest23488-21crond09:25:013
2820899337,2cyclictest0-21swapper/310:27:473
2820899331,7cyclictest0-21swapper/310:59:103
2820899331,5cyclictest7190-21ntp_states08:45:223
2820899331,4cyclictest6825-21sort07:30:253
2820899331,4cyclictest18193-21ntp_states09:10:223
2820899331,29cyclictest20598-21/usr/sbin/munin11:45:243
28208993310,20cyclictest6744-21/usr/sbin/munin10:00:133
2820199331,20cyclictest0-21swapper/208:45:042
2819599331,4cyclictest0-21swapper/110:42:391
2819199337,13cyclictest9686-21munin-run07:40:020
2820899329,2cyclictest11487-21df10:10:133
2820899323,6cyclictest5806-21smart_sda09:55:233
2820899321,6cyclictest26335-21timerandwakeup11:55:233
28208993216,13cyclictest29227-21ls09:35:223
2820899321,28cyclictest839-21lldpd09:33:263
28208993212,17cyclictest31896-21/usr/sbin/munin08:30:153
2820899321,10cyclictest87350irq/126-enp1s0-10:35:153
2820899321,10cyclictest87350irq/126-enp1s0-10:35:153
28208993210,19cyclictest5449-21unixbench_multi08:40:253
2820199321,19cyclictest0-21swapper/211:43:172
2820199321,19cyclictest0-21swapper/207:20:092
2820899316,4cyclictest9197-21/usr/sbin/munin08:50:183
2820899314,3cyclictest87350irq/126-enp1s0-09:10:013
2820899313,5cyclictest30663-21smart_sda12:05:263
2820899312,26cyclictest1097-21/usr/sbin/munin07:20:243
2820899312,25cyclictest10953-21ntpq07:40:203
28208993117,12cyclictest3419-21awk12:20:013
2820899311,5cyclictest16898-21diskmemload12:35:113
2820899311,4cyclictest6384-21perl12:25:153
28208993110,18cyclictest827-21runrttasks08:22:273
28208993110,18cyclictest827-21runrttasks08:22:273
28208993110,18cyclictest827-21runrttasks07:45:473
2820899310,9cyclictest0-21swapper/310:15:153
28201993127,3cyclictest0-21swapper/207:12:152
2820199311,14cyclictest0-21swapper/210:59:422
2820899308,4cyclictest0-21swapper/311:50:223
2820899308,3cyclictest2973-21/usr/sbin/munin11:05:143
2820899307,3cyclictest1819-21awk11:00:213
2820899306,13cyclictest87350irq/126-enp1s0-07:30:023
2820899305,3cyclictest87350irq/126-enp1s0-12:35:003
2820899302,4cyclictest27536-21diskstats12:00:143
2820899301,4cyclictest11785-21/usr/sbin/munin11:25:133
2820899301,26cyclictest16898-21diskmemload10:45:203
28208993010,17cyclictest2663-21sort08:35:213
28201993016,9cyclictest0-21swapper/212:07:492
2820199301,13cyclictest0-21swapper/208:16:282
2820199301,12cyclictest0-21swapper/211:28:012
28201993010,2cyclictest0-21swapper/207:55:252
2819599301,20cyclictest0-21swapper/111:37:361
2820899299,3cyclictest25578-21sendmail_mailst10:40:223
2820899297,4cyclictest763-21dbus-daemon09:50:203
2820899293,5cyclictest15372-21ntp_states07:50:213
2820899292,8cyclictest32415-21head07:15:233
2820899292,6cyclictest28390-21/usr/sbin/munin07:10:283
2820899291,5cyclictest14350-21diskstats11:30:143
2820899291,4cyclictest0-21swapper/311:10:173
2820899291,13cyclictest0-21swapper/308:02:393
28208992911,15cyclictest10003-21ntp_offset10:05:203
2820199291,19cyclictest0-21swapper/212:25:572
2820199291,12cyclictest0-21swapper/209:38:492
2820199291,11cyclictest0-21swapper/210:13:002
2820899289,3cyclictest10521-21acpi08:55:113
2820899289,2cyclictest827-21runrttasks11:24:563
2820899288,3cyclictest87350irq/126-enp1s0-11:15:173
2820899284,4cyclictest0-21swapper/312:10:213
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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