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2026-08-21 - 09:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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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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 376 highest latencies:
System rack9slot4s (updated Fri Aug 21, 2026 00:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
65642592546,31sleep00-21swapper/019:24:290
64982561517,29sleep10-21swapper/119:23:471
666999213189,17cyclictest8660-21munin-node19:30:010
295702840,4sleep029571-21sh20:22:000
6670997012,37cyclictest4144-21ntpq20:40:231
6670997010,37cyclictest32121-21cstates20:30:131
167912700,5sleep0111rcuc/021:15:140
6670996910,30cyclictest0-21swapper/121:40:171
6670996712,34cyclictest28240-21awk23:10:241
6670996612,36cyclictest31972-21netstat23:20:221
667099644,7cyclictest2695-21snmpd23:36:021
667099643,8cyclictest1115-21hddtemp_smartct23:25:161
667099641,44cyclictest7263-21pluginstate23:40:261
6670996411,34cyclictest24315-21cat00:25:291
667099632,7cyclictest1481-21hddtemp_smartct22:00:171
667099628,5cyclictest7085-21/usr/sbin/munin20:50:261
667099624,3cyclictest0-21swapper/121:35:111
667099617,3cyclictest0-21swapper/100:45:251
667099613,50cyclictest7334-21iostat_ios22:15:191
667099605,43cyclictest0-21swapper/121:15:171
667099603,5cyclictest0-21swapper/122:55:151
667099601,6cyclictest8887-21expr22:20:141
667099601,5cyclictest10116-21/usr/sbin/munin19:30:221
6670996013,36cyclictest12844-21aten_r4power_vo21:05:121
249832600,8sleep0666999cyclictest21:35:270
667099598,5cyclictest40250irq/92-i91523:10:001
667099598,5cyclictest40250irq/92-i91523:10:001
667099598,25cyclictest40250irq/92-i91520:25:081
667099598,25cyclictest40250irq/92-i91520:25:081
667099592,37cyclictest9651-21chrt23:46:311
667099591,5cyclictest591-21df_inode00:50:151
667099591,40cyclictest15257-21df19:45:121
667099591,40cyclictest15257-21df19:45:121
667099591,38cyclictest11457-21iostat_ios21:00:201
6670995910,30cyclictest16737-21cat22:40:181
667099582,7cyclictest3286-21runrttasks21:31:181
667099582,5cyclictest161512sleep121:13:071
667099582,44cyclictest0-21swapper/119:55:171
667099581,5cyclictest22113-21taskset20:02:421
667099581,43cyclictest9559-21iostat_ios20:55:181
667099572,9cyclictest3476-21hddtemp_smartct22:05:191
667099572,8cyclictest3286-21runrttasks21:46:261
667099571,39cyclictest23683-21/usr/sbin/munin23:00:261
667099561,6cyclictest11693-21hddtemp_smartct19:35:151
667099552,7cyclictest28436-21df_inode20:20:131
667099551,7cyclictest868-21cat22:00:011
667099551,7cyclictest4034-21chrt23:31:561
667099551,7cyclictest3273-21sed20:40:011
667099551,7cyclictest29318-21aten_r4power_cu23:15:111
667099551,7cyclictest17341-21hddtemp_smartct19:50:161
667099551,7cyclictest13492-21chrt23:57:261
667099551,6cyclictest11719-21chrt23:53:301
667099551,5cyclictest197112sleep121:20:551
6670995514,36cyclictest21489-21runrttasks22:53:371
667099546,5cyclictest25303-21aten_r4power_vo00:30:121
667099546,5cyclictest25303-21aten_r4power_vo00:30:121
667099544,6cyclictest20363-21awk00:15:261
667099542,6cyclictest6807-21taskset19:25:081
667099542,6cyclictest14928-21mailstats00:00:271
667099541,7cyclictest16446-21grep00:05:241
667099541,7cyclictest13192-21hostname19:40:101
667099541,6cyclictest6587-21chrt20:46:371
667099541,6cyclictest25671-21seq20:10:421
667099541,6cyclictest19617-21taskset22:48:381
667099541,6cyclictest11005-21hddtemp_smartct22:25:171
667099541,5cyclictest27473-21fschecks_time00:35:171
6670995410,39cyclictest2695-21snmpd00:11:161
667099532,7cyclictest29562-21iostat00:40:191
667099531,8cyclictest29973-21diskstats21:50:161
667099531,6cyclictest6722-21cat22:15:011
667099531,6cyclictest26943-21expr20:15:201
667099529,38cyclictest2695-21snmpd20:07:391
667099521,8cyclictest20275-21/usr/sbin/munin21:25:201
667099521,6cyclictest22066-21kernelversion00:20:211
248022520,7sleep0666999cyclictest23:00:290
667099511,6cyclictest14980-21cat22:35:211
667099501,7cyclictest12689-21diskstats22:30:151
99842481,30sleep09987-21cron23:50:000
6669993913,21cyclictest25692-21hddtemp_smartct00:30:180
6669993913,21cyclictest25692-21hddtemp_smartct00:30:170
666999391,14cyclictest14824-21cron19:45:000
6669993628,5cyclictest3201-21iostat23:30:200
666999361,20cyclictest1987-21mailstats22:00:290
6669993611,13cyclictest14561-21diskstats22:35:140
666999359,13cyclictest13692-21/usr/sbin/munin21:05:270
666999359,12cyclictest903-21irqstats00:50:210
6669993514,6cyclictest18995-21irqstats21:20:210
666999351,13cyclictest3374-21cut20:40:120
666999342,16cyclictest29562-21iostat00:40:190
666999334,9cyclictest18335-21diskstats22:45:160
666999331,20cyclictest23048-21users22:55:290
666999331,20cyclictest21451-21ntp_states20:00:240
666999331,17cyclictest17590-21needreboot19:50:230
6669993212,5cyclictest15151-21/usr/sbin/munin21:10:170
666999321,19cyclictest25388-21python20:10:260
324172321,5sleep00-21swapper/000:48:060
237132321,5sleep00-21swapper/021:33:250
214412321,5sleep00-21swapper/022:53:060
165062321,5sleep00-21swapper/019:48:080
165062321,5sleep00-21swapper/019:48:070
99792311,5sleep00-21swapper/022:21:080
666999319,7cyclictest26833-21seq20:15:170
666999318,4cyclictest32589-21wc21:55:270
666999311,26cyclictest19528-21/usr/sbin/munin19:55:230
296792311,5sleep00-21swapper/021:50:120
287402311,5sleep00-21swapper/000:39:320
27582311,5sleep00-21swapper/020:36:480
177872311,5sleep00-21swapper/022:44:060
99562301,5sleep00-21swapper/020:55:280
7972301,5sleep00-21swapper/020:31:250
666999305,13cyclictest12308-21seq21:02:130
666999303,15cyclictest0-21swapper/000:20:460
666999302,14cyclictest11882-21/usr/sbin/munin19:35:180
666999301,4cyclictest81rcu_preempt00:07:360
6669993013,5cyclictest7422-21memory22:15:210
666999301,24cyclictest28631-21ntpq21:45:240
666999301,15cyclictest22787-21df_inode20:05:150
64342301,5sleep00-21swapper/022:13:380
3642301,5sleep00-21swapper/023:24:040
308622301,5sleep00-21swapper/023:18:180
273292301,5sleep00-21swapper/021:41:500
218112301,5sleep00-21swapper/021:28:060
191752301,5sleep00-21swapper/000:12:480
155962301,5sleep00-21swapper/000:04:380
138772301,5sleep00-21swapper/022:32:410
118632301,5sleep00-21swapper/022:26:130
666999292,14cyclictest23625-21diskstats00:25:160
666999292,14cyclictest20289-21/usr/sbin/munin00:15:250
666999292,14cyclictest1457-21ntp_states23:25:240
666999292,14cyclictest12624-21iostat23:55:200
6669992911,5cyclictest4013-21swap22:05:300
666999291,15cyclictest11360-21unixbench_multi23:50:300
6669992910,14cyclictest30617-21iostat_ios20:25:190
6669992910,14cyclictest30617-21iostat_ios20:25:190
666999290,4cyclictest81rcu_preempt20:49:490
44882291,5sleep00-21swapper/023:35:060
291102291,5sleep00-21swapper/023:14:400
666999281,13cyclictest8494-21taskset20:51:500
107622281,5sleep00-21swapper/019:32:070
270172271,5sleep00-21swapper/023:07:230
270172271,5sleep00-21swapper/023:07:220
666999261,12cyclictest7412-21/usr/sbin/munin23:40:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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