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2026-04-15 - 02:00

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 50 highest latencies:
System rack2slot7s.osadl.org (updated Wed Apr 15, 2026 00:43:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3465425996150,7cyclictest0-21swapper/123:50:391
346542499614,42cyclictest3535294-21ssh21:50:360
3465424995441,10cyclictest1550375-21cups-browsed23:25:360
3465426994942,4cyclictest1051-21mta-sts-daemon00:06:452
3465426994941,5cyclictest421-21dbus-daemon21:45:012
3465425994937,8cyclictest3535480-21sh21:50:431
3465426994842,3cyclictest3498378-21kworker/u8:0-xprtiod22:35:012
3465426994839,5cyclictest0-21swapper/221:35:352
3465424994841,4cyclictest3659976-21systemd-run00:25:010
3465424994835,7cyclictest151ktimers/020:05:360
3465426994741,3cyclictest0-21swapper/222:00:452
3465424994739,6cyclictest420-21avahi-daemon20:20:010
3465426994637,5cyclictest3663995-21cron00:30:002
3465425994638,5cyclictest3492437-21systemd-run20:40:021
3465424994637,6cyclictest3559498-21/usr/sbin/munin22:20:300
3465426994537,5cyclictest3660113-21latency_hist00:25:022
3465426994537,5cyclictest3639732-21idleruntime-cro00:00:012
3465426994536,6cyclictest3627666-21systemd-run23:45:012
3465426994536,6cyclictest3627666-21systemd-run23:45:012
3465425994537,5cyclictest3639794-21systemd-run00:00:011
3465424994536,5cyclictest0-21swapper/000:20:000
3465426994437,4cyclictest3495424-21systemd-run20:50:012
3465425994436,4cyclictest0-21swapper/122:20:421
3465425994435,6cyclictest3513659-21munin-run21:25:011
3465424994435,6cyclictest421-21dbus-daemon22:00:010
3465424994434,4cyclictest0-21swapper/019:45:390
3465424994433,7cyclictest151ktimers/019:15:410
3465426994335,5cyclictest3655910-21awk00:20:002
3465426994335,5cyclictest3643807-21ssh00:05:012
3465424994337,3cyclictest0-21swapper/021:10:280
3465424994336,5cyclictest421-21dbus-daemon20:45:010
3465424994335,5cyclictest3556445-21sed22:15:490
3465424994335,4cyclictest0-21swapper/021:50:010
3465426994233,6cyclictest3572104-21ntp_kernel_err22:35:352
3465426994232,6cyclictest1550368-21cupsd23:16:372
3465424994233,3cyclictest0-21swapper/000:05:420
346542499423,31cyclictest3628974-21ssh23:45:440
3465424994231,8cyclictest1055-21mta-sts-daemon22:00:410
3465424994219,6cyclictest3640955-21ntpq00:00:380
3465426994132,5cyclictest1-21systemd23:15:012
3465426994128,6cyclictest440-21thd23:22:002
3465424994132,7cyclictest1-21systemd23:25:010
3465424994132,6cyclictest3666263-21kworker/u8:7+xprtiod00:35:360
3465426994028,9cyclictest3566872-21grep22:30:012
3465425994032,5cyclictest3552306-21/usr/sbin/munin22:10:461
3465425994032,5cyclictest3552306-21/usr/sbin/munin22:10:461
3465425994028,9cyclictest3502509-21needreboot21:10:351
3465424994031,6cyclictest1550375-21cups-browsed22:34:260
3465424994031,6cyclictest1-21systemd19:10:010
3465424994030,7cyclictest3551774-21collect222:10:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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