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2026-09-08 - 18:35

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 792 highest latencies:
System rack9slot4s (updated Tue Sep 08, 2026 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
62649912111167,26cyclictest7763-21ntp_states08:50:241
62639912021166,19cyclictest6684-21df07:25:120
62649911871146,26cyclictest0-21swapper/107:25:111
53652565517,31sleep10-21swapper/107:20:261
60322482417,49sleep00-21swapper/007:23:080
626399133108,22cyclictest0-21swapper/008:50:240
92492420,4sleep1211ktimersoftd/108:55:141
626399398,14cyclictest2225-21dbus-daemon09:56:200
626399372,22cyclictest761-21diskstats11:25:130
626399371,14cyclictest30402-21ps09:50:260
164322371,5sleep116467-21ntp_states12:05:241
626399364,13cyclictest4060-21unixbench_singl10:05:300
626399362,22cyclictest13073-21perl09:05:160
626499358,14cyclictest40250irq/92-i91507:50:011
6264993526,6cyclictest19393-21/usr/sbin/munin12:15:251
6242350,2sleep1623-21hddtemp_smartct12:50:131
626499345,4cyclictest81rcu_preempt10:45:111
626499341,15cyclictest0-21swapper/111:45:301
626399349,13cyclictest2225-21dbus-daemon12:22:120
626399348,14cyclictest30437-21taskset12:44:050
626399348,12cyclictest15414-21seq10:35:460
626399347,14cyclictest31043-21chrt11:20:030
626399343,15cyclictest9823-21python08:55:250
6263993413,7cyclictest8319-21munin-run10:20:010
626399341,21cyclictest22180-21/usr/sbin/munin10:55:190
626399341,13cyclictest0-21swapper/012:04:090
6263993410,12cyclictest17548-21unixbench_multi09:15:300
40062341,29sleep14012-21ntp_states08:40:271
218872341,4sleep121892-21irqstats12:20:181
626499337,4cyclictest81rcu_preempt12:25:271
6264993313,5cyclictest22-21ksoftirqd/111:43:301
6264993311,11cyclictest22-21ksoftirqd/110:35:141
626399331,20cyclictest31326-21irqstats12:45:200
626499326,4cyclictest81rcu_preempt09:36:281
626499324,4cyclictest81rcu_preempt07:55:181
626499322,16cyclictest7415-21ntp_states10:15:271
626499321,17cyclictest10634-21df10:25:121
626399328,12cyclictest9700-21taskset11:48:420
626399326,13cyclictest2731-21fschecks_count11:30:150
626399322,5cyclictest81rcu_preempt12:08:330
626399322,15cyclictest18345-21ntp_states12:10:240
626399321,20cyclictest28472-21ntp_states09:45:240
626399321,19cyclictest2401-21NetworkManager10:45:270
626399321,19cyclictest18736-21awk07:55:130
626399321,19cyclictest16417-21taskset07:48:450
133632321,4sleep113367-21irqstats07:40:201
626499315,4cyclictest81rcu_preempt11:24:451
626499315,4cyclictest81rcu_preempt09:57:511
626499315,4cyclictest81rcu_preempt08:13:481
626499312,11cyclictest0-21swapper/109:51:091
6264993117,11cyclictest22-21ksoftirqd/111:20:011
626499311,4cyclictest22-21ksoftirqd/110:55:181
6264993111,4cyclictest81rcu_preempt10:50:271
626499311,10cyclictest81rcu_preempt12:32:041
626499311,10cyclictest22-21ksoftirqd/107:38:081
6264993110,10cyclictest22-21ksoftirqd/111:05:211
626399319,18cyclictest46942chrt10:10:080
626399319,11cyclictest618-21taskset08:31:030
626399318,7cyclictest2225-21dbus-daemon12:15:030
626399316,13cyclictest28404-21fschecks_time08:20:180
626399315,4cyclictest81rcu_preempt07:33:090
626399312,15cyclictest24564-21memory09:35:230
626399312,15cyclictest14239-21file07:41:570
626399312,14cyclictest7256-21python11:40:270
626399311,4cyclictest81rcu_preempt12:27:270
272202310,3sleep041ktimersoftd/008:15:270
195712311,5sleep00-21swapper/009:21:020
195712311,5sleep00-21swapper/009:21:010
626499309,9cyclictest22-21ksoftirqd/111:13:471
626499306,4cyclictest81rcu_preempt09:31:351
626499305,4cyclictest81rcu_preempt09:19:041
626499304,17cyclictest0-21swapper/111:37:461
626499304,17cyclictest0-21swapper/111:37:461
626499303,12cyclictest0-21swapper/107:50:221
6264993016,10cyclictest22-21ksoftirqd/109:45:131
6264993013,6cyclictest22-21ksoftirqd/108:05:251
6264993012,5cyclictest3286-21runrttasks12:35:071
6264993012,3cyclictest81rcu_preempt07:32:431
6264993011,14cyclictest150652chrt12:00:451
6264993010,7cyclictest3286-21runrttasks09:00:151
626399309,5cyclictest826-21/usr/sbin/munin10:00:180
626399305,7cyclictest81rcu_preempt09:35:000
626399304,19cyclictest29452-21diskstats11:15:140
626399302,14cyclictest418-21df_inode12:50:100
626399302,14cyclictest16979-21df07:50:110
626399302,13cyclictest27116-21cron11:09:590
626399301,4cyclictest81rcu_preempt08:13:030
6263993012,5cyclictest11183-21ntp_states10:25:220
626399301,15cyclictest5271-21cstates08:45:120
56782301,5sleep00-21swapper/011:36:100
56782301,5sleep00-21swapper/011:36:090
626499299,7cyclictest2106-21users10:00:271
626499296,4cyclictest81rcu_preempt09:07:171
626499295,4cyclictest81rcu_preempt09:21:301
626499295,4cyclictest81rcu_preempt09:21:301
626499295,4cyclictest81rcu_preempt09:10:171
626499294,4cyclictest81rcu_preempt11:02:141
626499294,4cyclictest81rcu_preempt10:30:091
626499292,4cyclictest81rcu_preempt09:30:001
626399299,8cyclictest31052-21awk08:25:290
626399292,14cyclictest22646-21diskstats08:05:150
626399292,13cyclictest16305-21diskstats10:40:150
626399291,16cyclictest28031-21grep11:10:220
6263992911,6cyclictest11464-21irqstats07:35:180
626399291,15cyclictest20766-21df_inode08:00:130
6263992910,6cyclictest3777-21iostat_ios08:40:220
6263992910,6cyclictest10590-21iostat_ios11:50:190
6263992910,5cyclictest21858-21latency_hist09:30:000
304872291,5sleep10-21swapper/112:44:381
221442291,5sleep10-21swapper/108:04:361
122792291,5sleep00-21swapper/009:03:330
101472291,5sleep00-21swapper/010:24:330
626499285,4cyclictest81rcu_preempt11:59:041
626499283,4cyclictest81rcu_preempt11:26:031
626499283,17cyclictest0-21swapper/110:44:551
6264992820,6cyclictest0-21swapper/108:30:191
6264992814,10cyclictest22-21ksoftirqd/110:10:181
626499281,3cyclictest81rcu_preempt11:54:141
6264992810,5cyclictest40250irq/92-i91511:30:151
6264992810,14cyclictest3400-21cat10:05:191
626399289,6cyclictest26030-21ls09:40:130
626399283,18cyclictest24366-21ntp_states11:00:270
626399283,12cyclictest0-21swapper/010:30:240
626399282,14cyclictest0-21swapper/011:55:310
626399282,13cyclictest27453-21/usr/sbin/munin12:35:180
6263992811,5cyclictest26476-21chrt12:32:040
6263992810,6cyclictest14468-21/usr/sbin/munin09:10:170
322372281,5sleep10-21swapper/112:48:011
294682281,5sleep10-21swapper/108:22:311
27632281,5sleep10-21swapper/108:38:271
626499275,9cyclictest81rcu_preempt12:10:121
626499273,4cyclictest81rcu_preempt08:17:401
626499273,18cyclictest26369-21iostat_ios09:40:201
626499271,6cyclictest8733-21cstates10:20:111
6264992712,11cyclictest22-21ksoftirqd/108:45:271
626399271,14cyclictest2702-21chrt08:37:520
626399271,13cyclictest2225-21dbus-daemon10:51:110
312632271,5sleep10-21swapper/108:26:421
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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