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2026-09-11 - 22:51

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Fri Sep 11, 2026 12:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3258581995343,7cyclictest3453849-21latency_hist10:25:010
3258583994738,6cyclictest3533180-21latency_hist11:45:001
3258583994637,7cyclictest3448896-21latency_hist10:20:011
3258586994434,8cyclictest3345105-21cp08:35:002
3258586994236,4cyclictest3379610-21kworker/u8:3+flush-8:009:14:212
3258583994131,7cyclictest3513438-21latency_hist11:25:011
3258581994135,4cyclictest3233990-21kworker/u8:1+flush-8:007:19:210
3258581993831,5cyclictest2405913-21kworker/u8:3+flush-8:007:49:080
3258581993628,6cyclictest3498513-21latency_hist11:10:010
3258583993527,6cyclictest3310690-21/usr/sbin/munin08:04:161
3258581993528,5cyclictest3385362-21diskstats09:19:070
3258586993428,4cyclictest3498530-21kworker/u8:2+flush-8:012:29:222
325858399343,13cyclictest3439556-21apt-get10:14:051
325858399342,17cyclictest0-21swapper/108:34:031
3258586993328,4cyclictest3409547-21kworker/u8:1+events_unbound10:54:202
3258586993328,4cyclictest3345137-21kworker/u8:2+events_unbound10:09:212
3258586993328,3cyclictest3379610-21kworker/u8:3+flush-8:009:19:122
3258581993328,3cyclictest3345137-21kworker/u8:2+events_unbound09:30:000
3258581993325,6cyclictest3370226-21/usr/sbin/munin09:04:150
3258581993325,5cyclictest3438958-21kworker/u8:0+events_unbound10:45:010
32540712334,9sleep20-21swapper/207:08:542
35284422320,3sleep3451irq_work/311:40:013
34636042320,0sleep0201rcuc/010:34:220
3258583993228,2cyclictest3390766-21irqrtprio09:24:101
3258583993227,3cyclictest3475125-21irqrtprio10:49:101
3258583993227,3cyclictest3349890-21awk08:40:001
3258583993225,5cyclictest3489228-21apt-get11:04:041
3258583993223,6cyclictest3463721-21latency_hist10:35:001
3258581993213,5cyclictest3258575-21cyclictest07:10:000
325858399313,15cyclictest3545108-21cat11:59:111
3258583993127,3cyclictest3503353-21unixbench_singl11:14:221
3258581993124,5cyclictest3364765-21latency_hist08:55:010
3258581993122,7cyclictest3334832-21latency_hist08:25:000
3258581993121,7cyclictest3508482-21latency_hist11:20:010
3258583993020,8cyclictest3483090-21ntpq10:54:151
3258583993014,6cyclictest3280780-21apt-get07:34:031
325858399301,14cyclictest3557278-21ntpq12:09:171
3258581993020,8cyclictest3527599-21ntpq11:39:220
325858699290,27cyclictest3548840-21cpuspeed_turbos12:04:052
325858399296,12cyclictest3305758-21apt-get07:59:031
325858399295,12cyclictest3428527-21ntpq09:59:231
325858399293,16cyclictest0-21swapper/110:24:111
325858399293,13cyclictest3359213-21ntpq08:49:191
3258583992926,2cyclictest3384573-21systemd-run09:15:001
3258583992924,4cyclictest3538148-21true11:50:001
3258583992924,4cyclictest3538148-21true11:50:001
3258583992923,4cyclictest3498530-21kworker/u8:2+flush-8:011:19:201
3258583992912,7cyclictest3262838-21ntpq07:14:181
325858199298,3cyclictest33295452switchtime08:19:220
3258581992922,5cyclictest3409856-21/usr/sbin/munin09:44:150
3258581992922,5cyclictest3340298-21apt-get08:34:030
3258581992922,5cyclictest3315090-21latency_hist08:05:010
3258581992922,3cyclictest0-21swapper/007:44:170
3258581992921,5cyclictest3404343-21latency_hist09:35:000
3258581992921,5cyclictest3404343-21latency_hist09:35:000
3258581992917,10cyclictest3221732-21kworker/u8:0+flush-8:008:59:190
3258586992824,2cyclictest3464393-21aten2_r5power_v10:39:062
3258586992824,2cyclictest3355518-21aten2_r5power_p08:49:072
325858399284,12cyclictest3582077-21ntpq12:34:171
325858399283,15cyclictest0-21swapper/111:30:001
325858399283,14cyclictest3473295-21ntpq10:44:201
3258583992824,3cyclictest3233990-21kworker/u8:1-ext4-rsv-conversion07:55:001
3258583992823,3cyclictest3399262-21unixbench_singl09:29:231
325858399281,9cyclictest3315408-21sshd08:06:161
3258583992814,2cyclictest0-21swapper/110:04:211
3258583992813,3cyclictest0-21swapper/107:15:041
325858399281,17cyclictest3330452-21apt-get08:24:041
325858399281,15cyclictest3299463-21ntpq07:49:171
325858399280,18cyclictest3575251-21grep12:29:121
325858399280,11cyclictest3290317-21latency_hist07:40:011
3258581992824,3cyclictest3233990-21kworker/u8:1+flush-8:009:09:090
3258581992824,2cyclictest3275183-21unixbench_singl07:24:220
3258581992822,4cyclictest3324803-21unixbench_multi08:14:230
3258581992821,5cyclictest3259027-21apt-get07:14:050
3258586992721,5cyclictest3221732-21kworker/u8:0+flush-8:008:59:172
325858399273,11cyclictest3388888-21ntpq09:19:171
3258583992722,3cyclictest3337533-21kthreadcore08:29:131
3258583992722,3cyclictest0-21swapper/111:54:091
3258583992721,3cyclictest0-21swapper/107:10:001
325858399272,12cyclictest3364114-21ntpq08:54:151
325858399271,17cyclictest3571121-21kthreadcore12:24:131
325858399271,16cyclictest3378995-21ntpq09:09:181
325858399271,16cyclictest3274666-21ntpq07:24:151
325858399271,14cyclictest3522714-21ntpq11:34:161
325858399270,15cyclictest3373990-21ntpq09:04:151
325858399270,14cyclictest0-21swapper/110:09:041
3258581992723,2cyclictest3513438-21sh11:25:000
325858199272,24cyclictest3263467-21kworker/0:2+events08:37:310
3258581992722,3cyclictest3390336-21fschecks_count09:24:070
3258581992721,4cyclictest3542948-21unixbench_multi11:54:210
3258581992719,6cyclictest3583457-21diskstats12:39:130
3258581992718,7cyclictest3429108-21latency_hist10:00:010
325858199270,25cyclictest1-21systemd08:46:160
3258586992622,3cyclictest3521565-21kworker/u8:0+events_unbound12:34:092
3258586992622,2cyclictest3345529-21aten2_r5power_e08:39:062
3258586992621,3cyclictest3533044-21unixbench_multi11:44:232
3258586992621,3cyclictest3508469-21cron11:20:012
3258586992620,4cyclictest3438958-21kworker/u8:0+flush-8:010:44:242
325858399267,10cyclictest0-21swapper/107:44:061
325858399263,12cyclictest3458127-21ntpq10:29:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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