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2026-09-01 - 18:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Tue Sep 01, 2026 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1359121440,3sleep20-21swapper/210:54:282
1215421150,3chrt0-21swapper/309:24:293
854721110,2chrt0-21swapper/309:14:283
854721110,2chrt0-21swapper/309:14:283
2809421020,4sleep20-21swapper/210:09:182
40812960,3sleep30-21swapper/311:59:053
247962960,2sleep30-21swapper/311:24:283
247962960,2sleep30-21swapper/311:24:283
122902740,3sleep20-21swapper/210:54:082
122902740,3sleep20-21swapper/210:54:082
118822700,2chrt11880-21ntp_states09:24:260
314682670,2chrt31474-21sh10:19:050
245142630,3sleep10-21swapper/111:24:261
245142630,3sleep10-21swapper/111:24:261
174612610,1sleep017484-21wc12:34:170
130662530,2sleep0201rcuc/010:54:220
84112520,4sleep08406-21cron10:44:050
84112520,4sleep08406-21cron10:44:050
268592520,1sleep00-21swapper/010:04:250
268592520,1sleep00-21swapper/010:04:250
143982490,3sleep114399-21/usr/sbin/munin08:04:271
87852480,3chrt0-21swapper/012:09:240
87852480,3chrt0-21swapper/012:09:240
190802460,2sleep00-21swapper/008:19:090
190802460,2sleep00-21swapper/008:19:090
61902450,3sleep10-21swapper/107:44:171
2764299440,3cyclictest181rcu_preempt10:04:101
2764299440,3cyclictest181rcu_preempt10:04:101
2764299431,8cyclictest700-21192.168.115.40-manager09:55:101
2764299431,8cyclictest700-21192.168.115.40-manager09:55:101
2764299431,7cyclictest700-21192.168.115.40-manager12:19:441
2764299431,7cyclictest700-21192.168.115.40-manager12:19:441
2764299431,7cyclictest203402sed08:19:291
2764299431,7cyclictest203402sed08:19:291
2764299431,5cyclictest700-21192.168.115.40-manager09:29:391
2764299431,5cyclictest700-21192.168.115.40-manager09:29:391
39402410,2chrt0-21swapper/007:39:050
27642994123,16cyclictest28465-21kernelversion10:09:211
27641994132,7cyclictest15223-21cron08:09:050
202632410,2sleep20-21swapper/209:49:052
2764299402,7cyclictest700-21192.168.115.40-manager10:35:121
2764299402,7cyclictest700-21192.168.115.40-manager10:35:121
2764299401,9cyclictest18006-21/usr/sbin/munin09:39:291
2764299401,9cyclictest18006-21/usr/sbin/munin09:39:291
277482390,4chrt0-21swapper/211:34:202
277482390,4chrt0-21swapper/211:34:202
2764299393,5cyclictest700-21192.168.115.40-manager12:30:151
2764299382,6cyclictest700-21192.168.115.40-manager10:40:111
2764299382,6cyclictest700-21192.168.115.40-manager10:40:111
2764299381,7cyclictest700-21192.168.115.40-manager11:04:421
2764299381,7cyclictest700-21192.168.115.40-manager11:04:421
2764299373,5cyclictest700-21192.168.115.40-manager11:59:441
2764299373,5cyclictest700-21192.168.115.40-manager11:59:441
2764299372,6cyclictest700-21192.168.115.40-manager08:25:071
2764299372,6cyclictest28895-21sshd11:37:261
2764299372,6cyclictest28895-21sshd11:37:261
2764299371,11cyclictest18556-21unixbench_singl08:14:281
2764299371,11cyclictest18556-21unixbench_singl08:14:281
2764299370,10cyclictest3490-21if_wlan010:29:201
2764299362,5cyclictest700-21192.168.115.40-manager12:40:141
2764299362,5cyclictest700-21192.168.115.40-manager12:40:141
27642993613,21cyclictest0-21swapper/110:59:291
27642993613,21cyclictest0-21swapper/110:59:291
2764299361,11cyclictest32192-21sort11:44:291
2764299361,11cyclictest1658-21latency_hist08:59:111
2764299361,11cyclictest1658-21latency_hist08:59:111
2764299361,11cyclictest12178-21cron10:54:051
2764299361,11cyclictest12178-21cron10:54:051
2764299361,10cyclictest19841-21latency_hist11:14:131
2764299361,10cyclictest19841-21latency_hist11:14:131
2764299351,9cyclictest7395-21grep12:04:281
2764299351,9cyclictest7395-21grep12:04:281
2764299351,7cyclictest3953-21latency_hist07:39:051
27642993512,21cyclictest0-21swapper/108:29:261
27642993512,21cyclictest0-21swapper/108:29:261
2764299351,11cyclictest8647-21/usr/sbin/munin10:44:211
2764299351,11cyclictest8366-21grep12:09:191
2764299351,11cyclictest8366-21grep12:09:191
2764299351,11cyclictest537-21/usr/sbin/munin11:49:231
2764299351,11cyclictest26958-21rt-features10:04:261
2764299351,11cyclictest26958-21rt-features10:04:261
2764299351,11cyclictest25164-21sort08:34:201
2764299351,11cyclictest25164-21sort08:34:201
2764299351,11cyclictest15940-21grep08:09:191
2764299351,11cyclictest15940-21grep08:09:191
2764299351,11cyclictest13319-21cat10:54:271
2764299350,10cyclictest22358-21memory11:19:221
2764299350,10cyclictest22358-21memory11:19:221
2764299342,9cyclictest10467-21unixbench_singl09:19:291
2764299342,9cyclictest10467-21unixbench_singl09:19:291
2764299341,9cyclictest29391-21processes08:44:261
2764299341,9cyclictest2603-21fschecks_count11:54:181
27642993417,15cyclictest0-21swapper/109:04:221
27642993415,17cyclictest0-21swapper/110:24:241
2764299341,12cyclictest15606-21ntpq09:34:241
2764299341,12cyclictest15606-21ntpq09:34:241
2764299341,11cyclictest5849-21sed07:44:051
2764299341,11cyclictest5849-21sed07:44:051
2764299341,11cyclictest29882-21sort11:39:221
2764299341,11cyclictest29882-21sort11:39:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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