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2026-08-10 - 08:15

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 10, 2026 00:43:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3652921996053,4cyclictest1002-21mta-sts-daemon20:26:000
3652922995232,6cyclictest3777630-21latency23:35:501
3652923994736,8cyclictest3761684-21sh23:10:022
3652922994738,5cyclictest3791870-21ssh00:00:021
3652922994738,5cyclictest3791870-21ssh00:00:021
3652921994739,5cyclictest421-21dbus-daemon00:25:010
3652921994739,5cyclictest421-21dbus-daemon00:25:010
3652921994735,7cyclictest12650irq/32-eth023:35:550
3652921994537,5cyclictest3816040-21systemctl00:40:010
3652921994535,7cyclictest421-21dbus-daemon20:15:020
3652921994531,9cyclictest12650irq/32-eth000:06:050
3652921994527,13cyclictest0-21swapper/023:20:520
3652922994436,5cyclictest3770774-21latency_hist23:25:021
3652923994335,5cyclictest3746592-21systemd22:45:012
3652923994335,5cyclictest3746592-21systemd22:45:012
3652923994331,9cyclictest3777501-21idleruntime23:35:482
3652922994338,2cyclictest0-21swapper/119:20:011
3652921994333,7cyclictest3685892-21munin-plugin-st21:00:010
3652922994235,4cyclictest3803961-21sendmail00:20:011
3652922994235,4cyclictest3803961-21sendmail00:20:011
3652923994133,3cyclictest0-21swapper/200:20:452
3652923994133,3cyclictest0-21swapper/200:20:452
3652922994132,6cyclictest420-21avahi-daemon23:46:041
3652921994129,8cyclictest3687640-21kworker/u8:4-xprtiod21:11:120
3652921994128,10cyclictest3760002-21sendmail_mailst23:06:010
365292199412,32cyclictest3808210-21sh00:26:000
365292199412,32cyclictest3808210-21sh00:26:000
365292399402,30cyclictest3783945-21ssh23:45:542
365292299403,30cyclictest3787081-21ssh23:51:001
3652921994032,4cyclictest0-21swapper/023:55:530
3652921994032,4cyclictest0-21swapper/023:55:530
3652921994028,8cyclictest420-21avahi-daemon21:29:580
3652921994026,11cyclictest421-21dbus-daemon23:00:010
365292399393,29cyclictest3774858-21ssh23:30:582
3652923993930,6cyclictest3695096-21ssh21:20:022
3652922993931,5cyclictest3759611-21memory23:05:501
3652921993932,4cyclictest1003-21mta-sts-daemon21:05:540
365292199392,29cyclictest3711427-21ssh21:45:540
3652923993830,5cyclictest3660430-21systemd-run19:35:012
3652923993829,6cyclictest3679820-21head20:36:062
3652923993828,6cyclictest3754101-21timerandwakeup22:56:062
3652922993832,3cyclictest0-21swapper/121:55:011
3652922993831,3cyclictest0-21swapper/122:40:591
3652922993831,3cyclictest0-21swapper/122:40:591
3652922993830,5cyclictest3741265-21fschecks_time22:35:461
3652922993830,5cyclictest3725420-21systemd-run22:10:011
3652922993830,5cyclictest3663936-21fschecks_count19:45:471
3652922993830,4cyclictest3676916-21basename20:30:011
3652922993828,7cyclictest1002-21mta-sts-daemon22:02:121
3652922993822,3cyclictest171rcu_preempt22:55:011
365292199383,28cyclictest443-21gpm23:30:560
3652921993831,4cyclictest3739211-21grep22:31:040
3652921993829,6cyclictest439-21systemd-logind20:05:010
3652923993730,3cyclictest0-21swapper/222:05:542
3652923993729,5cyclictest3682930-21systemd-run20:50:012
3652923993729,5cyclictest3667894-21latency_hist20:00:012
3652923993729,5cyclictest3657439-21sh19:25:012
3652923993729,5cyclictest3657439-21sh19:25:012
3652922993731,3cyclictest0-21swapper/100:10:011
3652922993729,5cyclictest3707374-21ssh21:40:021
365292199372,28cyclictest3741792-21ssh22:36:000
3652923993627,5cyclictest0-21swapper/219:40:012
365292399361,28cyclictest3717574-21ssh21:55:572
3652922993629,4cyclictest3732819-21sendmail_mailqu22:21:041
3652922993628,5cyclictest3810726-21fschecks_count00:30:471
3652922993628,5cyclictest3773783-21latency_hist23:30:021
3652922993628,5cyclictest3755581-21grep23:00:011
3652921993626,7cyclictest3675435-21sh20:25:010
3652921993622,11cyclictest265-21systemd-journal23:55:010
3652921993619,15cyclictest1000-21mta-sts-daemon19:50:560
3652923993528,4cyclictest3767695-21cron23:20:012
3652923993528,3cyclictest0-21swapper/223:45:012
3652923993527,5cyclictest3690684-21unixbench_singl21:11:122
3652923993526,5cyclictest3795026-21latency_hist00:05:032
3652922993527,5cyclictest3667935-21systemd-run20:00:011
3652921993528,3cyclictest0-21swapper/023:00:520
3652921993526,6cyclictest3658983-21latency_hist19:30:020
3652921993525,7cyclictest3696012-21latency21:20:490
3652921993525,6cyclictest3735070-21aten2.4-expect22:25:450
3652923993428,3cyclictest0-21swapper/200:26:092
3652923993428,3cyclictest0-21swapper/200:26:092
3652923993426,5cyclictest3687300-21tail21:01:082
3652922993427,4cyclictest3764678-21munin-plugin-st23:15:011
3652922993427,4cyclictest3688919-21ssh21:10:011
3652922993427,4cyclictest3676936-21kworker/u8:8-rpciod21:56:491
3652922993427,3cyclictest0-21swapper/122:25:581
3652922993426,5cyclictest3814795-21grep00:36:081
3652922993426,5cyclictest3809976-21latency_hist00:30:001
3652922993426,5cyclictest3809976-21latency_hist00:30:001
3652922993426,5cyclictest3729083-21cpuspeed22:15:441
3652921993427,3cyclictest0-21swapper/021:55:560
3652921993426,5cyclictest1000-21mta-sts-daemon22:14:590
3652921993424,6cyclictest421-21dbus-daemon22:03:470
3652921993424,5cyclictest0-21swapper/022:09:520
365292399335,21cyclictest443-21gpm21:05:562
365292399333,23cyclictest3735621-21ssh22:25:562
3652923993326,4cyclictest0-21swapper/222:20:472
3652923993325,5cyclictest3714004-21cpuspeed21:50:452
3652923993325,5cyclictest3702201-21missed_timers21:30:542
3652923993323,7cyclictest3791844-21dpkg-db-backup00:00:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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