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2026-05-20 - 08:03

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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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 Wed May 20, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
45742241162,25sleep00-21swapper/019:08:020
44602238162,24sleep10-21swapper/119:06:351
45542203166,24sleep20-21swapper/219:07:492
45872201164,24sleep30-21swapper/319:08:153
197521470,3sleep2482399cyclictest21:25:532
854921460,4sleep1481899cyclictest00:10:151
4823991101,107cyclictest0-21swapper/219:57:592
171092540,2sleep317113-21if_enp2s023:15:193
118172540,4sleep0481199cyclictest00:15:230
75442470,2sleep339-21rcuc/320:25:233
482399393,22cyclictest87550irq/128-enp1s0-20:15:242
482399374,19cyclictest30499-21missed_timers23:45:202
482399371,32cyclictest26609-21grep23:35:252
482399371,26cyclictest19843-21chrt22:09:252
482399371,26cyclictest19843-21chrt22:09:252
482399371,25cyclictest0-21swapper/222:15:152
4811993711,12cyclictest29311-21munin-run23:45:020
482399361,21cyclictest6701-21latency_hist21:40:022
481199368,14cyclictest8305-21basename20:30:000
482399356,20cyclictest12050irq/123-ahci[0000:15:002
482399352,29cyclictest24959-40dnf19:51:232
4811993510,12cyclictest24914-21munin-run23:35:020
168782350,4sleep1481899cyclictest00:30:021
482399343,21cyclictest28283-21latency_hist21:15:012
481199347,12cyclictest27466-21perf20:00:010
482399335,16cyclictest12050irq/123-ahci[0000:20:022
482399332,27cyclictest22048-21diskstats21:00:132
482399332,26cyclictest32181-21ntp_states22:35:222
482399331,3cyclictest25889-21perf21:10:012
482399331,3cyclictest0-21swapper/222:30:262
482399331,22cyclictest4114-21/usr/sbin/munin20:20:152
482399331,19cyclictest27397-21/usr/sbin/munin22:25:162
482399322,27cyclictest31025-21head20:05:232
482399322,26cyclictest28748-21ntp_states20:00:222
482399322,26cyclictest16369-21smart_sda20:45:232
482399321,6cyclictest9989-21latency21:45:212
482399321,22cyclictest22939-21/usr/sbin/munin23:30:142
482399321,22cyclictest14343-21irqstats21:55:182
482399312,25cyclictest13854-21smart_sda00:20:262
482399311,18cyclictest6425-21ntp_states22:50:252
482399311,18cyclictest16992-21smartctl22:00:272
4823993110,18cyclictest11734-21pluginstate23:05:002
482399310,22cyclictest87350irq/126-enp1s0-20:30:232
481199318,11cyclictest4519-21perf21:35:020
481199311,14cyclictest24295-21munin-run22:20:010
482399305,13cyclictest87550irq/128-enp1s0-00:30:162
482399301,25cyclictest378-21/usr/sbin/munin20:10:192
482399301,17cyclictest11958-21/usr/sbin/munin23:05:182
482399301,15cyclictest0-21swapper/223:25:182
481199304,13cyclictest13305-21munin-run21:55:000
482999299,9cyclictest39-21rcuc/322:25:243
482999291,3cyclictest39-21rcuc/323:20:173
482999291,3cyclictest39-21rcuc/323:20:173
482399295,21cyclictest22129-21ntp_kernel_pll_19:45:212
482399292,24cyclictest909-21sssd_nss20:55:142
482399292,24cyclictest909-21sssd_nss20:55:142
482399292,23cyclictest19948-21ntp_states19:40:212
482399292,23cyclictest11779-21ntp_states20:35:202
482399291,5cyclictest0-21swapper/223:20:062
482399291,5cyclictest0-21swapper/223:20:062
482399291,4cyclictest5891-21/usr/sbin/munin19:10:212
482399291,3cyclictest87550irq/128-enp1s0-19:30:212
482399291,3cyclictest87350irq/126-enp1s0-22:10:042
482399291,3cyclictest31774-21/usr/sbin/munin21:20:242
482399291,3cyclictest15213-21/usr/sbin/munin23:10:192
482399291,25cyclictest909-21sssd_nss23:40:212
482399291,24cyclictest19526-21diskstats00:35:152
482399291,24cyclictest12397-21ntp_states21:50:222
4823992910,16cyclictest7552-21/usr/sbin/munin22:55:162
4823992910,16cyclictest26637-21sort22:25:022
482399290,19cyclictest0-21swapper/221:20:012
481199290,22cyclictest18114-21kworker/0:023:29:050
482399289,17cyclictest6346-21cpu20:25:112
482399289,16cyclictest10354-21expr19:20:112
482399282,23cyclictest763-21dbus-daemon22:40:062
482399282,23cyclictest17975-21hddtemp_smartct20:50:152
482399281,3cyclictest12912-21/usr/sbin/munin20:40:222
482399281,24cyclictest827-21runrttasks23:57:042
482399281,24cyclictest4304-21fschecks_time00:00:162
482399281,23cyclictest9373-21grep19:15:252
482399281,23cyclictest6121-21cpuspeed_turbos00:05:172
482399281,23cyclictest2930-21cut21:30:152
482399281,23cyclictest17087-21cut19:35:162
482399281,23cyclictest16770-21fschecks_count23:15:162
482399281,23cyclictest14876-21cpuspeed_turbos00:25:132
482399281,23cyclictest14280-21basename19:30:012
482399271,3cyclictest7614-21hddtemp_smartct21:40:162
482399271,3cyclictest3147-21/usr/sbin/munin22:45:122
482399271,2cyclictest31730-21/usr/sbin/munin23:50:172
481199279,10cyclictest0-21swapper/021:20:270
481199270,12cyclictest18672-21idleruntime-cro19:40:000
481899267,12cyclictest0-21swapper/122:36:321
481899265,6cyclictest7084-40dnf22:52:081
482999251,12cyclictest1229-21memory21:25:173
481899259,13cyclictest0-21swapper/123:35:221
481899251,16cyclictest0-21swapper/122:42:211
4818992510,13cyclictest12327-21kworker/u8:221:02:041
482999248,3cyclictest5107-21cat22:49:563
482999241,12cyclictest839-21lldpd23:12:113
482999241,11cyclictest5931-21memory19:10:223
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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