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2026-08-24 - 23:56

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 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 Mon Aug 24, 2026 12:42:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1556241995534,18cyclictest1577255-21systemd-run08:20:010
155624199524,20cyclictest12650irq/32-eth011:01:040
155624199522,27cyclictest1596531-21ssh09:16:060
1556242995041,6cyclictest1695346-21aten_r2power_vo12:00:531
1556243994839,6cyclictest1556252-21systemd-run07:10:012
1556243994712,5cyclictest171rcu_preempt11:36:082
1556241994629,9cyclictest12650irq/32-eth010:51:020
1556241994624,6cyclictest1574735-21fschecks_count08:10:550
1556243994537,5cyclictest1595290-21grep09:15:012
1556243994536,6cyclictest421-21dbus-daemon11:55:012
1556243994436,4cyclictest1000-21mta-sts-daemon09:35:132
1556241994433,8cyclictest1670615-21cron11:20:000
1556241994425,4cyclictest1684063-21mailstats11:41:100
1556242994334,6cyclictest1631223-21latency_hist10:15:031
1556242994334,6cyclictest1631223-21latency_hist10:15:031
1556242994234,5cyclictest1000-21mta-sts-daemon10:01:321
1556243994133,5cyclictest744038-21cups-browsed10:58:212
1556243994128,9cyclictest1565261-21systemd-run07:40:012
1556242994132,2cyclictest0-21swapper/111:26:041
1556241994134,4cyclictest1566756-21systemd-run07:45:010
1556243994031,5cyclictest1571212-21idleruntime-cro08:00:012
1556242994034,3cyclictest0-21swapper/107:30:011
1556242994032,5cyclictest1563837-21latency_hist07:35:021
1556242994032,5cyclictest1563837-21latency_hist07:35:021
1556242994031,6cyclictest744038-21cups-browsed09:32:481
1556242994031,6cyclictest744038-21cups-browsed09:32:481
1556242994031,6cyclictest1634239-21latency_hist10:20:021
1556243993932,4cyclictest1697696-21cron12:05:012
1556243993930,6cyclictest1702076-21processes12:11:092
1556242993932,4cyclictest1685648-21grep11:45:011
1556241993930,6cyclictest1675423-21unixbench_multi11:26:130
1556241993928,8cyclictest1559265-21kworker/u8:16-rpciod07:40:010
1556243993828,6cyclictest1611026-21fschecks_time09:40:562
1556243993828,6cyclictest1002-21mta-sts-daemon11:16:552
1556242993830,5cyclictest1664549-21systemd-run11:10:021
1556242993830,5cyclictest1659984-21switchtime11:01:121
1556241993822,12cyclictest12650irq/32-eth012:16:050
1556241993822,12cyclictest12650irq/32-eth012:16:050
1556241993818,10cyclictest151ktimers/008:51:030
1556243993728,5cyclictest1706744-21awk12:20:012
1556243993728,5cyclictest1706744-21awk12:20:012
1556242993730,4cyclictest1000-21mta-sts-daemon11:16:061
1556242993729,5cyclictest1667565-21cron11:15:011
1556242993727,7cyclictest744035-21cupsd12:06:081
1556242993726,8cyclictest1707805-21missed_timers12:20:581
1556242993726,8cyclictest1707805-21missed_timers12:20:581
1556242993726,6cyclictest0-21swapper/110:46:051
1556241993729,5cyclictest1595277-21ssh09:15:010
1556241993727,7cyclictest744038-21cups-browsed08:10:020
1556243993630,3cyclictest0-21swapper/209:35:012
1556243993630,3cyclictest0-21swapper/209:35:012
1556243993628,5cyclictest1624933-21cron10:05:012
1556243993627,6cyclictest1631964-21kernelversion10:15:542
1556243993626,6cyclictest744038-21cups-browsed09:56:112
1556243993622,10cyclictest421-21dbus-daemon10:31:002
1556242993630,3cyclictest0-21swapper/109:46:181
1556242993628,5cyclictest1693371-21unixbench-2d11:56:141
1556242993624,9cyclictest1656545-21ntp_kernel_pll_10:56:021
155624299362,24cyclictest1611437-21ssh09:41:051
1556241993630,4cyclictest1681569-21grep11:36:170
1556241993629,4cyclictest1592336-21latency_hist09:10:020
1556241993627,7cyclictest1634061-21munin-run10:20:010
1556241993615,15cyclictest1686833-21ssh11:46:010
155624399353,26cyclictest1653619-21ssh10:51:042
1556243993526,6cyclictest421-21dbus-daemon11:25:012
1556243993525,7cyclictest1637115-21sh10:25:012
1556243993523,9cyclictest1646728-21/usr/sbin/munin10:40:552
1556242993528,4cyclictest1673717-21latency_hist11:25:011
1556242993528,4cyclictest1590881-21latency_hist09:05:031
1556241993528,4cyclictest1679753-21cron11:35:010
1556241993525,7cyclictest1620161-21ntp_kernel_pll_09:56:060
1556241993523,5cyclictest1646215-21ssh10:40:010
155624399346,7cyclictest171rcu_preempt07:25:592
1556243993428,4cyclictest1556240-21cyclictest12:21:262
1556243993428,4cyclictest1556240-21cyclictest12:21:262
1556243993427,4cyclictest0-21swapper/209:00:012
1556243993426,5cyclictest1718780-21cron12:40:002
1556243993425,6cyclictest1684334-21unixbench-2d11:41:132
1556243993425,6cyclictest1586241-21true08:50:012
1556243993424,6cyclictest744038-21cups-browsed10:45:072
155624299343,21cyclictest1690011-21rm11:51:081
1556242993428,4cyclictest1556240-21cyclictest08:25:011
1556242993426,5cyclictest1649310-21systemd-run10:45:011
1556242993426,5cyclictest1610235-21sendmail09:40:011
1556242993425,6cyclictest421-21dbus-daemon11:46:001
1556242993424,7cyclictest1626527-21timerandwakeup10:06:121
1556242993423,8cyclictest1584134-21ntp_kernel_pll_08:41:011
1556242993423,8cyclictest1584134-21ntp_kernel_pll_08:41:011
1556242993422,5cyclictest0-21swapper/111:35:481
155624199343,18cyclictest1647477-21ssh10:41:050
1556241993428,4cyclictest1718776-21ssh12:40:000
1556241993426,5cyclictest421-21dbus-daemon12:05:020
1556241993425,5cyclictest744038-21cups-browsed09:51:470
1556241993424,7cyclictest1692446-21sh11:55:560
1556243993323,6cyclictest1674781-21needreboot11:25:582
1556242993327,3cyclictest0-21swapper/108:30:011
1556242993325,5cyclictest1711486-21grep12:26:131
1556242993325,5cyclictest1711486-21grep12:26:131
1556242993325,5cyclictest1595281-21cron09:15:011
1556242993321,7cyclictest0-21swapper/110:26:081
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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