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2026-04-29 - 11:36

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 here to display the system's profile data or here to proceed to next system.
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 Wed Apr 29, 2026 00:43:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1722864996844,20cyclictest1-21systemd00:30:012
1722862996658,5cyclictest1815701-21munin-run22:20:000
172286299554,45cyclictest1873057-21ssh23:30:450
1722863995243,6cyclictest421-21dbus-daemon21:50:011
1722864995140,7cyclictest4122572-21cups-browsed21:50:582
1722864995040,6cyclictest1-21systemd23:25:012
1722864994943,3cyclictest0-21swapper/223:00:532
1722863994940,5cyclictest1905614-21grep00:10:561
1722864994840,5cyclictest1827849-21systemd-run22:35:012
1722864994839,5cyclictest4122572-21cups-browsed00:00:002
1722862994840,5cyclictest1831779-21ssh22:40:010
1722864994739,5cyclictest1750026-21sendmail20:40:012
1722863994734,9cyclictest1787498-21/usr/sbin/munin21:45:011
1722863994638,5cyclictest1903867-21latency_hist00:10:021
1722863994635,8cyclictest1849055-21ssh23:00:451
1722862994617,22cyclictest12350irq/32-eth020:20:460
1722864994534,7cyclictest4122572-21cups-browsed22:50:502
1722862994532,10cyclictest1847814-21sendmail-msp23:00:010
1722862994528,14cyclictest1803611-21cron22:05:010
1722862994528,14cyclictest1803611-21cron22:05:010
1722864994438,3cyclictest0-21swapper/221:35:022
1722864994433,8cyclictest1733344-21systemd19:44:472
1722863994438,3cyclictest0-21swapper/122:20:011
1722863994335,5cyclictest1807675-21systemd-run22:10:011
1722863994335,5cyclictest1807675-21systemd-run22:10:011
1722863994335,5cyclictest1799660-21latency_hist22:00:021
1722862994335,5cyclictest1887872-21systemd-run23:50:010
1722862994335,5cyclictest1887872-21systemd-run23:50:010
1722862994328,11cyclictest0-21swapper/022:00:010
1722862994325,15cyclictest1808962-21sh22:10:460
1722864994234,5cyclictest1823830-21latency_hist22:30:022
1722862994231,8cyclictest1787529-21sh21:45:010
172286499414,30cyclictest1760239-21ssh21:10:452
1722864994132,6cyclictest421-21dbus-daemon22:45:022
1722864994132,5cyclictest1913404-21unixbench_singl00:20:562
1722863994132,6cyclictest421-21dbus-daemon21:15:011
1722863994131,7cyclictest1837505-21timerandwakeup22:46:021
1722863994131,7cyclictest1837505-21timerandwakeup22:46:021
1722863994130,6cyclictest0-21swapper/100:25:491
1722863994125,3cyclictest171rcu_preempt23:25:451
172286299413,31cyclictest1825174-21ssh22:30:510
1722862994129,8cyclictest0-21swapper/020:05:480
1722862994128,9cyclictest1900903-21missed_timers00:05:410
172286299412,32cyclictest1877064-21ssh23:35:460
1722864994033,4cyclictest0-21swapper/223:00:012
1722863994032,5cyclictest1739498-21systemd-run20:05:011
1722863994032,4cyclictest0-21swapper/121:50:541
1722862994032,5cyclictest1760604-21mailstats21:10:560
172286299402,30cyclictest4122567-21cupsd21:45:500
1722862994020,2cyclictest0-21swapper/019:25:470
1722862994020,2cyclictest0-21swapper/019:25:470
1722863993932,2cyclictest0-21swapper/121:15:541
1722863993923,8cyclictest171rcu_preempt22:40:521
1722862993933,4cyclictest1922672-21cron00:35:010
1722864993831,4cyclictest1863816-21systemd-run23:20:012
1722864993829,5cyclictest421-21dbus-daemon19:30:012
1722864993829,5cyclictest421-21dbus-daemon19:30:012
1722864993828,6cyclictest1-21systemd21:20:022
1722864993826,9cyclictest1772207-21kernelversion21:25:402
1722863993829,4cyclictest0-21swapper/100:00:011
1722863993828,5cyclictest0-21swapper/123:35:581
172286499379,22cyclictest1905059-21ssh00:10:462
172286499374,26cyclictest1784802-21ssh21:40:492
1722864993731,3cyclictest0-21swapper/200:35:012
1722863993730,3cyclictest0-21swapper/121:30:441
1722863993729,5cyclictest1-21systemd22:15:011
1722863993729,5cyclictest1054-21mta-sts-daemon23:05:431
172286399371,33cyclictest1841160-21ssh22:50:541
1722862993729,5cyclictest597-21gdbus20:01:490
1722862993729,5cyclictest1835920-21kworker/u8:16-xprtiod23:40:500
1722862993729,5cyclictest1835920-21kworker/u8:16-xprtiod23:40:500
1722862993728,7cyclictest1816540-21fschecks_count22:20:380
172286299372,19cyclictest1833018-21ssh22:40:450
1722862993721,11cyclictest12350irq/32-eth021:35:450
1722864993630,3cyclictest0-21swapper/222:40:012
1722864993627,6cyclictest1869700-21head23:25:592
1722864993624,9cyclictest1909443-21timerwakeupswit00:15:562
1722864993624,9cyclictest1909443-21timerwakeupswit00:15:562
1722864993624,8cyclictest1812915-21ntp_kernel_err22:15:492
1722863993628,5cyclictest0-21swapper/100:40:011
1722863993627,7cyclictest1864404-21aten_r2power_po23:20:321
1722863993626,6cyclictest420-21avahi-daemon21:29:521
1722863993625,7cyclictest420-21avahi-daemon21:38:081
1722863993612,3cyclictest171rcu_preempt19:15:461
1722862993630,4cyclictest421-21dbus-daemon00:15:010
1722862993630,3cyclictest0-21swapper/019:40:000
1722862993630,2cyclictest0-21swapper/022:25:400
1722862993628,6cyclictest1-21systemd23:15:020
1722862993622,11cyclictest1863755-21sh23:20:000
1722862993616,13cyclictest151ktimers/019:10:470
172286299361,28cyclictest1776577-21rm21:30:480
172286499353,24cyclictest1837028-21ssh22:45:472
172286499353,24cyclictest1837028-21ssh22:45:472
1722864993529,3cyclictest0-21swapper/221:20:412
1722864993527,4cyclictest0-21swapper/223:30:352
1722864993525,6cyclictest4122572-21cups-browsed21:37:352
1722864993523,5cyclictest0-21swapper/222:05:322
1722864993523,5cyclictest0-21swapper/222:05:322
172286399353,24cyclictest1768365-21ssh21:20:431
1722863993528,3cyclictest0-21swapper/123:55:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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