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2026-09-01 - 01:38

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 Mon Aug 31, 2026 12:59:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
121159912611,1255cyclictest2185-21strings08:20:221
121149912401216,7cyclictest0-21swapper/007:25:100
121159911591115,32cyclictest12266-21aten_r4power_cu07:25:111
106782776729,30sleep00-21swapper/007:20:160
120392729683,30sleep10-21swapper/107:24:481
1211499216190,23cyclictest0-21swapper/008:20:220
1218021100,2sleep012182-21aten_r4power_po11:40:120
3342920,3sleep0111rcuc/009:40:280
172402450,9sleep01211499cyclictest10:25:260
12114993711,13cyclictest9562-21unixbench_singl11:30:300
269952361,31sleep027046-21switchtime09:25:270
12115993615,7cyclictest23012-21ntpq09:15:231
150962331,4sleep115216-21fschecks_time07:30:171
1211499332,20cyclictest18900-21df_inode07:40:140
12114993319,4cyclictest20169-21cron09:10:000
12114993310,11cyclictest28366-21http_loadtime09:30:160
225022321,4sleep022511-21diskstats09:15:130
220932321,27sleep122157-21sshd10:40:151
176212321,4sleep111564-21packagekitd10:26:441
1211599322,7cyclictest1252-21munin-run08:20:011
1211499329,7cyclictest2225-21dbus-daemon10:05:010
1211499327,12cyclictest17483-21netstat07:35:230
12114993212,7cyclictest11869-21/usr/sbin/munin08:45:270
12114993212,6cyclictest10852-21df_inode10:10:130
12114993212,5cyclictest29672-21df11:00:120
1211499321,19cyclictest3638-21cstates08:25:130
41402311,3sleep02401-21NetworkManager11:17:230
1211599315,4cyclictest81rcu_preempt11:53:511
1211599315,4cyclictest81rcu_preempt11:01:301
1211599312,16cyclictest3400-21wc11:15:241
12115993115,13cyclictest22-21ksoftirqd/107:50:271
1211499316,5cyclictest81rcu_preempt10:45:190
1211499313,14cyclictest11038-21snmpd12:33:350
1211499312,14cyclictest7448-21df_inode08:35:150
1211499312,14cyclictest11038-21snmpd12:03:290
12114993115,5cyclictest23071-21seq12:08:290
22472301,3sleep10-21swapper/112:40:121
215552301,5sleep00-21swapper/010:38:380
190302301,5sleep00-21swapper/011:55:410
144642301,5sleep10-21swapper/108:54:241
1211599301,3cyclictest81rcu_preempt08:34:151
12115993012,6cyclictest11565-21gdbus11:45:321
1211599301,10cyclictest0-21swapper/111:12:131
1211499308,17cyclictest2225-21dbus-daemon08:07:170
1211499303,14cyclictest30294-21users12:25:310
1211499302,13cyclictest3011-21memory12:40:230
1211499301,4cyclictest81rcu_preempt12:13:410
1211499301,4cyclictest81rcu_preempt07:46:020
12114993012,6cyclictest25058-21/usr/sbin/munin09:20:240
12114993012,6cyclictest24897-21/usr/sbin/munin07:55:170
12114993011,6cyclictest1176-21hddtemp_smartct11:10:150
12114993011,6cyclictest1106-21awk12:35:210
12114993011,5cyclictest3-21ksoftirqd/008:54:260
75212291,5sleep00-21swapper/012:51:530
68422291,5sleep00-21swapper/008:33:270
316642291,5sleep10-21swapper/108:13:311
291222291,5sleep10-21swapper/110:59:071
276562291,5sleep00-21swapper/008:00:500
267102291,5sleep10-21swapper/112:17:201
264612291,4sleep126554-21uname10:50:271
219532291,5sleep00-21swapper/009:14:010
160972291,3sleep10-21swapper/108:56:531
137632291,5sleep10-21swapper/110:15:531
1211599295,4cyclictest81rcu_preempt09:52:441
1211599295,4cyclictest81rcu_preempt07:42:561
1211599294,4cyclictest81rcu_preempt12:31:141
1211599291,7cyclictest26319-21fschecks_count09:25:151
1211599291,3cyclictest81rcu_preempt08:04:251
1211599291,15cyclictest6576-21fschecks_time12:50:141
1211499299,6cyclictest23068-21unixbench_multi10:40:300
1211499296,5cyclictest30150-21fschecks_time09:35:160
1211499295,11cyclictest0-21swapper/011:48:250
1211499292,13cyclictest14639-21df_inode10:20:140
1211499291,4cyclictest81rcu_preempt10:52:280
1211499291,4cyclictest81rcu_preempt08:15:320
12114992911,6cyclictest9516-21ntp_states10:05:230
1211499291,14cyclictest6007-21chrt11:22:050
103352291,5sleep00-21swapper/008:40:330
96112281,5sleep10-21swapper/111:30:351
86652281,5sleep10-21swapper/108:37:561
80012281,5sleep10-21swapper/111:28:221
306222281,5sleep10-21swapper/112:28:501
250452281,5sleep10-21swapper/110:45:441
248942281,5sleep10-21swapper/112:12:591
1211599285,4cyclictest81rcu_preempt10:03:101
1211599284,4cyclictest81rcu_preempt11:23:211
1211599283,13cyclictest0-21swapper/112:08:291
12115992818,6cyclictest29957-21cpuspeed_turbos09:35:131
12115992818,5cyclictest5443-21grep12:45:301
1211599281,3cyclictest81rcu_preempt10:30:271
12115992813,12cyclictest22-21ksoftirqd/109:05:201
12115992812,5cyclictest40250irq/92-i91509:40:171
12115992810,14cyclictest0-21swapper/110:10:211
1211499282,4cyclictest81rcu_preempt12:45:430
1211499282,14cyclictest16590-21/usr/sbin/munin11:50:230
1211499282,14cyclictest15458-21/usr/sbin/munin07:30:220
1211499282,13cyclictest0-21swapper/009:45:190
1211499282,13cyclictest0-21swapper/009:03:220
1211499281,17cyclictest29127-21runrttasks10:59:080
12114992811,6cyclictest4089-21/usr/sbin/munin09:50:410
1211499281,14cyclictest26293-21grep12:15:280
12114992810,6cyclictest23194-21ntp_states07:50:260
12114992810,5cyclictest18458-21fschecks_count10:30:170
289832271,5sleep10-21swapper/109:30:261
255272271,5sleep10-21swapper/109:21:551
210692271,5sleep10-21swapper/112:02:121
184152271,4sleep10-21swapper/107:39:561
158152271,5sleep10-21swapper/110:22:291
138582271,4sleep00-21swapper/010:16:530
1211599276,4cyclictest81rcu_preempt08:29:391
1211599276,4cyclictest81rcu_preempt07:57:341
1211599274,4cyclictest81rcu_preempt12:36:561
1211599274,4cyclictest81rcu_preempt08:44:101
1211599273,8cyclictest20638-21diskstats09:10:151
1211599273,4cyclictest81rcu_preempt08:05:311
1211599272,4cyclictest81rcu_preempt07:47:441
1211599271,12cyclictest3286-21runrttasks09:48:101
1211499271,13cyclictest32106-21/usr/sbin/munin11:05:240
115052271,5sleep10-21swapper/111:35:461
80412261,5sleep00-21swapper/011:28:470
182032261,5sleep10-21swapper/109:04:031
134792261,5sleep10-21swapper/111:41:291
1211599263,4cyclictest81rcu_preempt08:46:201
1211599262,10cyclictest27749-21iostat_ios12:20:191
12115992610,5cyclictest40250irq/92-i91511:05:241
1211499263,17cyclictest5527-21irqstats09:55:220
1211499261,16cyclictest0-21swapper/008:57:270
1211499261,14cyclictest30692-21iostat08:10:200
1211499261,13cyclictest11482-21/usr/sbin/munin11:35:310
102692261,5sleep10-21swapper/110:08:391
1211599253,12cyclictest40250irq/92-i91510:35:181
1211599252,19cyclictest0-21swapper/109:55:251
1211499251,11cyclictest0-21swapper/012:23:320
1211599241,19cyclictest18566-21ntp_states11:55:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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