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2026-06-08 - 00:56

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 rack2slot7s.osadl.org (updated Sun Jun 07, 2026 12:42:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3312772996150,7cyclictest420-21avahi-daemon11:41:060
3312772996150,7cyclictest420-21avahi-daemon11:41:060
3312772995950,6cyclictest439-21systemd-logind12:35:020
3312774995848,5cyclictest3445921-21kworker/u8:7-writeback11:45:062
3312774995848,5cyclictest3445921-21kworker/u8:7-writeback11:45:062
3312774995645,7cyclictest3379935-21awk10:00:012
331277499484,31cyclictest3471949-21ssh12:26:042
331277499473,35cyclictest3348761-21diskmemload10:06:042
3312772994740,3cyclictest0-21swapper/011:50:010
3312772994740,3cyclictest0-21swapper/011:50:010
3312772994736,8cyclictest3364361-21basename09:35:010
3312772994733,11cyclictest3462551-21missed_timers12:11:050
331277499462,37cyclictest3457345-21ssh12:02:002
331277399464,34cyclictest3371911-21ssh09:46:081
3312772994637,5cyclictest420-21avahi-daemon10:21:040
3312772994637,5cyclictest420-21avahi-daemon10:21:040
3312774994436,5cyclictest0-21swapper/208:40:012
331277399442,30cyclictest3459690-21ssh12:06:101
3312772994335,5cyclictest3417130-21getprofile11:00:000
3312774994234,5cyclictest3442765-21ssh11:40:002
3312774994234,5cyclictest3442765-21ssh11:40:002
3312774994232,6cyclictest3402265-21aten_r2power_vo10:35:562
3312774994232,6cyclictest3402265-21aten_r2power_vo10:35:562
3312773994233,6cyclictest3339718-21/usr/sbin/munin08:36:171
3312774994134,3cyclictest0-21swapper/208:30:012
3312774994133,5cyclictest3330764-21cut08:10:012
3312773994133,4cyclictest0-21swapper/112:26:081
3312773994129,9cyclictest3477860-21kernelversion12:36:001
3312773994124,14cyclictest271ktimers/111:11:041
3312772994134,4cyclictest3410925-21systemd-run10:50:010
3312772994134,4cyclictest3410925-21systemd-run10:50:010
3312774994027,5cyclictest0-21swapper/209:16:072
3312773994031,5cyclictest3390732-21cut10:16:171
3312773994031,5cyclictest3390732-21cut10:16:171
3312773994030,6cyclictest2524656-21cups-browsed10:08:321
3312772994033,5cyclictest3312832-21latency_hist07:10:010
3312772994032,5cyclictest3456633-21proc_pri12:01:140
3312772994026,10cyclictest3332269-21sh08:15:010
3312774993931,5cyclictest3467632-21cut12:20:012
3312774993931,5cyclictest0-21swapper/211:45:022
3312774993931,5cyclictest0-21swapper/211:45:022
331277499392,32cyclictest3387469-21ssh10:11:082
3312773993933,3cyclictest0-21swapper/112:01:031
3312773993931,4cyclictest0-21swapper/110:01:021
3312773993930,6cyclictest420-21avahi-daemon09:21:021
3312772993930,6cyclictest2524652-21cupsd11:15:580
3312774993829,6cyclictest3430378-21sendmail11:20:012
3312774993829,4cyclictest0-21swapper/209:35:022
331277499381,30cyclictest3412078-21ssh10:51:032
331277499381,30cyclictest3412078-21ssh10:51:032
3312773993832,3cyclictest0-21swapper/110:35:001
3312773993832,3cyclictest0-21swapper/110:35:001
3312773993832,3cyclictest0-21swapper/110:00:011
3312773993830,5cyclictest3444015-21ntp_kernel_pll_11:41:041
3312773993830,5cyclictest3444015-21ntp_kernel_pll_11:41:041
3312772993831,4cyclictest3373731-21systemd-run09:50:010
3312772993829,5cyclictest3437975-21proc_pri11:31:120
3312772993829,5cyclictest3437975-21proc_pri11:31:120
3312774993729,5cyclictest3476872-21cron12:35:012
3312774993729,3cyclictest0-21swapper/209:41:022
3312774993728,4cyclictest0-21swapper/209:30:012
3312774993727,7cyclictest2524656-21cups-browsed12:08:042
3312774993726,7cyclictest2524656-21cups-browsed09:22:292
3312773993732,2cyclictest0-21swapper/111:20:011
3312773993729,5cyclictest3335787-21fschecks_count08:25:561
3312773993728,6cyclictest3326243-21cron07:55:001
3312773993728,6cyclictest2524656-21cups-browsed11:36:091
3312773993728,6cyclictest2524656-21cups-browsed11:36:091
3312773993727,4cyclictest0-21swapper/110:41:071
3312773993711,20cyclictest3434656-21ssh11:26:021
331277299373,29cyclictest3359458-21ssh09:26:080
3312772993729,5cyclictest421-21dbus-daemon10:55:010
3312772993729,5cyclictest421-21dbus-daemon10:55:010
3312772993728,6cyclictest2524656-21cups-browsed08:16:160
3312772993727,7cyclictest3355627-21aten_r2power_fr09:20:530
3312774993629,3cyclictest0-21swapper/211:55:012
3312774993629,3cyclictest0-21swapper/211:55:012
3312774993628,5cyclictest3431233-21fschecks_time11:20:592
3312774993628,5cyclictest3431233-21fschecks_time11:20:592
3312774993628,5cyclictest0-21swapper/207:31:062
3312774993624,7cyclictest3415231-21sh10:56:052
3312773993629,3cyclictest0-21swapper/110:55:011
3312773993629,3cyclictest0-21swapper/110:55:011
3312773993627,6cyclictest261-21systemd-journal11:00:441
3312773993623,9cyclictest3467624-21idleruntime-cro12:20:011
3312772993630,4cyclictest3381723-21tail10:01:160
331277299362,31cyclictest3419302-21sh11:01:100
331277299361,15cyclictest3350982-21kworker/u8:3+rpciod09:41:020
3312774993527,5cyclictest3406547-21unixbench_singl10:41:172
3312774993527,5cyclictest3348772-21ssh09:10:012
3312774993527,5cyclictest1055-21mta-sts-daemon11:25:462
3312774993527,3cyclictest0-21swapper/211:11:122
3312774993526,6cyclictest3409542-21unixbench-2d10:46:172
3312774993526,6cyclictest3409542-21unixbench-2d10:46:172
3312773993527,5cyclictest3410901-21/usr/sbin/munin10:50:011
3312773993527,5cyclictest3410901-21/usr/sbin/munin10:50:011
331277399352,23cyclictest3365791-21ssh09:36:121
3312773993521,8cyclictest0-21swapper/110:21:101
3312773993521,8cyclictest0-21swapper/110:21:101
3312772993529,4cyclictest3335293-21kworker/u8:11-rpciod09:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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