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2026-04-23 - 23:39

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 Apr 23, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
43002232160,59sleep00-21swapper/007:07:290
41932203166,24sleep30-21swapper/307:06:073
41972202164,25sleep20-21swapper/207:06:102
41612202166,23sleep10-21swapper/107:05:411
67221800,3sleep1458799cyclictest09:25:151
4593991330,116cyclictest0-21swapper/209:09:472
4593991171,114cyclictest0-21swapper/210:01:482
4593991171,114cyclictest0-21swapper/210:01:482
299822520,2sleep30-21swapper/310:30:223
62622510,7sleep232-21ksoftirqd/208:25:122
70472480,2sleep30-21swapper/309:40:143
460099432,35cyclictest3288-40dnf11:59:263
4593994340,2cyclictest0-21swapper/212:33:342
460099423,33cyclictest21021-40dnf08:57:243
460099421,30cyclictest28006-21latency11:40:183
167902410,1sleep10-21swapper/112:30:121
460099376,17cyclictest808-21snmpd10:08:283
460099373,22cyclictest87350irq/126-enp1s0-12:15:203
460099371,28cyclictest5794-21/usr/sbin/munin12:05:143
460099371,27cyclictest5362-21fschecks_time07:10:143
460099371,27cyclictest24351-21hddtemp_smartct09:05:163
460099371,18cyclictest27218-21dump-pmu-power08:00:013
460099361,25cyclictest24914-21latency_hist11:35:023
460099361,25cyclictest24102-21latency_hist10:20:023
460099358,19cyclictest808-21snmpd12:03:343
460099356,16cyclictest31542-21/usr/sbin/munin11:50:263
460099353,21cyclictest87550irq/128-enp1s0-08:05:263
460099351,26cyclictest808-21snmpd09:19:283
458399358,13cyclictest11-21rcuc/011:50:010
4583993510,12cyclictest9642-21munin-run07:20:010
460099340,24cyclictest0-21swapper/307:45:253
460099339,16cyclictest16455-21/usr/sbin/munin07:35:233
460099332,3cyclictest12050irq/123-ahci[0008:50:013
460099331,3cyclictest87350irq/126-enp1s0-09:55:143
460099330,24cyclictest0-21swapper/307:40:133
460099330,24cyclictest0-21swapper/307:40:133
458399338,12cyclictest4278-21munin-run09:35:020
460099325,15cyclictest12378-21/usr/sbin/munin12:20:193
460099325,15cyclictest12378-21/usr/sbin/munin12:20:183
460099321,5cyclictest0-21swapper/310:25:213
460099321,27cyclictest808-21snmpd09:23:033
458399327,11cyclictest0-21swapper/008:10:010
460099311,6cyclictest0-21swapper/311:25:163
460099311,4cyclictest27131-21smart_sda09:10:213
460099311,26cyclictest14609-21diskstats07:30:143
460099311,22cyclictest16246-21sshd12:26:173
458799311,27cyclictest21196-21dnf07:45:121
458799311,27cyclictest10537-21diskstats12:15:151
460099306,21cyclictest3353-21ntpq09:30:213
460099304,14cyclictest23563-21cut07:50:153
460099302,5cyclictest7094-21diskstats07:15:033
460099302,25cyclictest9202-40dnf10:58:273
460099301,6cyclictest26708-21sshd11:37:263
460099301,3cyclictest20979-21ntp_states10:10:203
460099301,25cyclictest12410-21diskstats07:25:143
460099301,22cyclictest808-21snmpd12:38:413
4600993012,15cyclictest2359-21vmstat10:40:253
460099301,17cyclictest8119-21cpuspeed_turbos12:10:113
460099300,5cyclictest0-21swapper/308:10:143
460099300,5cyclictest0-21swapper/308:00:243
458799306,7cyclictest0-21swapper/110:47:461
460099296,20cyclictest11896-21interrupts09:50:183
460099296,12cyclictest87350irq/126-enp1s0-08:15:143
460099294,13cyclictest87350irq/126-enp1s0-09:35:153
460099293,15cyclictest87350irq/126-enp1s0-08:50:143
460099292,24cyclictest7282-21ls10:55:003
460099291,7cyclictest1565-21unixbench-2d09:25:243
460099291,5cyclictest0-21swapper/310:03:023
460099291,5cyclictest0-21swapper/310:03:023
460099291,17cyclictest30714-21timerandwakeup11:45:263
460099291,13cyclictest5912-21latency_hist08:25:013
460099290,3cyclictest87350irq/126-enp1s0-08:40:123
458799291,25cyclictest25644-21diskmemload09:19:191
458799290,18cyclictest0-21swapper/107:59:591
460099287,18cyclictest11773-21/usr/sbin/munin11:05:253
460099284,20cyclictest10155-21grep11:00:153
460099284,13cyclictest87350irq/126-enp1s0-08:35:173
460099283,21cyclictest8951-21cut08:30:143
460099281,6cyclictest0-21swapper/311:23:523
460099281,6cyclictest0-21swapper/310:45:143
460099281,5cyclictest25644-21diskmemload10:20:103
460099281,4cyclictest9954-21ntp_offset09:45:213
460099281,3cyclictest7624-21/usr/sbin/munin08:25:253
460099281,3cyclictest16901-21/usr/sbin/munin11:15:173
460099281,3cyclictest16901-21/usr/sbin/munin11:15:173
460099281,3cyclictest15032-21/usr/sbin/munin11:10:203
4600992813,12cyclictest21578-21tr09:00:123
459399288,11cyclictest0-21swapper/212:10:202
458799288,3cyclictest21243-21munin-run09:00:011
458799281,12cyclictest8070-21awk08:30:011
458799281,11cyclictest13967-21users12:20:251
458799281,11cyclictest13967-21users12:20:251
460099271,3cyclictest30927-21/usr/sbin/munin10:35:263
460099271,3cyclictest10573-21/usr/sbin/munin07:20:163
460099271,2cyclictest16774-21/usr/sbin/munin12:30:203
4593992724,2cyclictest0-21swapper/208:45:372
458399270,20cyclictest0-21swapper/010:14:250
459399261,10cyclictest0-21swapper/209:21:572
458799261,2cyclictest0-21swapper/112:06:081
458799261,2cyclictest0-21swapper/111:12:331
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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