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2026-08-12 - 10:24

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 Aug 12, 2026 00:43:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3144318995646,6cyclictest0-21swapper/121:26:021
3144319995345,5cyclictest3308664-21sh00:40:012
3144319994837,7cyclictest3184870-21switchtime21:16:062
3144317994838,7cyclictest3284254-21munin-run00:00:010
3144318994637,6cyclictest3305837-21latency_hist00:35:021
314431899463,30cyclictest3196922-21ssh21:35:571
3144317994637,4cyclictest0-21swapper/000:36:000
3144319994530,11cyclictest3180303-21diskmemload23:26:102
3144317994529,13cyclictest12650irq/32-eth023:51:000
3144318994436,5cyclictest3287826-21acpi00:05:471
3144317994430,11cyclictest3250706-21idleruntime-cro23:05:010
3144318994335,5cyclictest3166798-21cron20:25:001
3144317994323,5cyclictest171rcu_preempt21:35:550
3144318994232,7cyclictest3232387-21latency_hist22:35:021
3144317994233,6cyclictest3275704-21aten_r2power_fr23:45:480
3144317994230,9cyclictest567-21gdbus21:55:010
3144318994134,4cyclictest3168370-21latency_hist20:30:011
314431799413,34cyclictest151ktimers/000:25:540
314431799413,34cyclictest151ktimers/000:25:540
314431799412,31cyclictest3190744-21ssh21:25:570
3144319994033,4cyclictest3211018-21ssh22:00:012
3144319994033,3cyclictest0-21swapper/222:10:002
3144319994033,3cyclictest0-21swapper/222:10:002
3144319994032,5cyclictest3159325-21kworker/u8:9-xprtiod20:00:012
314431999402,23cyclictest3300661-21ssh00:25:542
314431999402,23cyclictest3300661-21ssh00:25:542
314431899405,30cyclictest665-21snmpd19:21:031
3144318994033,4cyclictest3201856-21sh21:45:001
3144318994032,5cyclictest3171333-21systemd-run20:40:021
3144318994011,7cyclictest28-21ksoftirqd/120:20:001
3144318994011,7cyclictest28-21ksoftirqd/120:20:001
3144317994034,3cyclictest0-21swapper/022:20:010
3144317994033,4cyclictest3293453-21latency_hist00:15:020
3144317994033,4cyclictest0-21swapper/021:31:010
3144317994033,4cyclictest0-21swapper/021:31:010
3144319993931,5cyclictest439-21systemd-logind23:25:012
3144318993932,4cyclictest3277028-21kworker/u8:8-rpciod00:15:491
3144318993930,6cyclictest420-21avahi-daemon20:06:091
3144318993930,6cyclictest0-21swapper/121:50:481
3144319993831,4cyclictest3183383-21sh21:15:012
3144319993828,7cyclictest421-21dbus-daemon21:48:252
3144318993832,3cyclictest0-21swapper/123:20:491
3144318993830,4cyclictest0-21swapper/100:20:501
3144318993827,8cyclictest3251646-21latency23:05:531
3144318993822,2cyclictest171rcu_preempt23:31:001
3144317993832,4cyclictest3232379-21ssh22:35:020
3144317993832,4cyclictest3168315-21systemd-run20:30:010
3144317993824,4cyclictest3174178-21unixbench_multi20:46:070
314431799382,26cyclictest3200000-21ssh21:40:570
3144317993821,10cyclictest151ktimers/022:51:010
3144317993817,16cyclictest12650irq/32-eth023:11:020
314431999373,26cyclictest3161856-21sshd20:06:092
3144319993728,6cyclictest265-21systemd-journal22:40:002
3144319993727,6cyclictest1434212-21cupsd21:25:162
3144318993729,5cyclictest485-21in:imuxsock22:40:001
314431899371,27cyclictest3212262-21ssh22:01:031
314431899371,27cyclictest3212262-21ssh22:01:031
3144317993731,3cyclictest0-21swapper/000:10:010
3144317993720,11cyclictest3259852-21munin-run23:20:010
3144317993720,11cyclictest3259852-21munin-run23:20:010
314431799371,30cyclictest191rcuc/019:36:010
3144317993710,6cyclictest12750irq/33-eth022:45:560
314431999365,18cyclictest3258057-21ssh23:16:002
314431999365,18cyclictest3258057-21ssh23:16:002
3144319993630,3cyclictest0-21swapper/220:35:022
3144319993626,8cyclictest3180320-21sh21:10:012
3144319993626,7cyclictest3284254-21munin-run00:00:012
3144319993626,7cyclictest265-21systemd-journal00:15:012
3144319993626,7cyclictest1003-21mta-sts-daemon22:20:442
3144318993631,2cyclictest0-21swapper/121:20:011
3144318993628,5cyclictest3306576-21latency00:35:511
3144318993628,5cyclictest3223201-21munin-run22:20:011
3144318993627,6cyclictest421-21dbus-daemon00:13:591
3144318993627,4cyclictest0-21swapper/122:45:571
3144318993626,6cyclictest1434245-21cups-browsed23:03:221
314431899362,24cyclictest3193868-21ssh21:30:591
314431899362,24cyclictest3193868-21ssh21:30:591
314431899361,17cyclictest3258048-21ssh23:15:591
314431899361,17cyclictest3258048-21ssh23:15:591
3144317993627,7cyclictest3177313-21idleruntime-cro21:00:010
3144317993621,5cyclictest1001-21mta-sts-daemon21:56:310
3144319993527,5cyclictest3303366-21fschecks_time00:30:482
3144319993525,6cyclictest421-21dbus-daemon21:35:452
3144319993524,7cyclictest3294015-21aten_r2power_po00:15:462
3144319993523,9cyclictest3193683-21missed_timers21:30:532
3144319993523,9cyclictest3193683-21missed_timers21:30:532
314431999351,28cyclictest3251884-21ssh23:05:592
314431899353,26cyclictest3215313-21ssh22:06:001
314431899353,26cyclictest3215313-21ssh22:06:001
3144318993529,3cyclictest0-21swapper/121:25:011
3144318993528,4cyclictest3220144-21/usr/sbin/munin22:15:011
3144318993527,5cyclictest3159299-21systemctl20:00:011
3144318993527,5cyclictest3149275-21cpuspeed19:25:461
3144318993525,6cyclictest421-21dbus-daemon23:10:541
3144318993523,9cyclictest3278599-21/usr/sbin/munin23:50:521
314431899352,28cyclictest3245793-21ssh22:55:571
3144317993528,5cyclictest3166880-21latency_hist20:25:010
3144317993525,3cyclictest3188232-21sed21:21:090
3144317993523,9cyclictest0-21swapper/023:30:000
3144317993522,9cyclictest3266822-21kworker/u8:223:30:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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