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2026-06-21 - 16:11

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 50 highest latencies:
System rack4slot1s.osadl.org (updated Sun Jun 21, 2026 12:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
385621190,3chrt0-21swapper/208:37:592
385621190,3chrt0-21swapper/208:37:592
385621190,3chrt0-21swapper/208:37:592
1584821080,3sleep20-21swapper/209:08:152
1584821080,3sleep20-21swapper/209:08:152
129832900,8sleep1281ktimers/111:53:161
129832900,8sleep1281ktimers/111:53:161
313132840,3sleep10-21swapper/111:16:501
313132840,3sleep10-21swapper/111:16:501
262152830,3sleep20-21swapper/212:28:182
262152830,3sleep20-21swapper/212:28:182
262152830,3sleep20-21swapper/212:28:182
147462730,3chrt0-21swapper/109:03:231
147462730,3chrt0-21swapper/109:03:231
72092710,4sleep30-21swapper/311:38:143
72092710,4sleep30-21swapper/311:38:143
27312680,2chrt2735-21latency08:33:150
27312680,2chrt2735-21latency08:33:150
27312680,2chrt2735-21latency08:33:150
300822630,2sleep10-21swapper/109:47:211
300822630,2sleep10-21swapper/109:47:211
300822630,2sleep10-21swapper/109:47:211
152552620,2chrt0-21swapper/311:58:203
152552620,2chrt0-21swapper/311:58:203
177522610,3sleep30-21swapper/307:48:083
177522610,3sleep30-21swapper/307:48:083
11722600,3chrt0-21swapper/311:23:113
227262590,1sleep122743-21latency_hist09:28:041
227262590,1sleep122743-21latency_hist09:28:041
227262590,1sleep122743-21latency_hist09:28:041
227262590,1sleep122743-21latency_hist09:28:041
85652580,3sleep20-21swapper/211:43:082
85652580,3sleep20-21swapper/211:43:082
234802560,3chrt0-21swapper/308:03:113
234802560,3chrt0-21swapper/308:03:113
251142500,4sleep124677-21/usr/sbin/munin09:33:141
251142500,4sleep124677-21/usr/sbin/munin09:33:141
251142500,4sleep124677-21/usr/sbin/munin09:33:141
251142500,4sleep124677-21/usr/sbin/munin09:33:141
180142470,4sleep20-21swapper/209:13:172
180142470,4sleep20-21swapper/209:13:172
291582460,2sleep20-21swapper/209:43:162
291582460,2sleep20-21swapper/209:43:162
291582460,2sleep20-21swapper/209:43:162
138422460,1sleep2351rcuc/210:28:182
138422460,1sleep2351rcuc/210:28:182
138422460,1sleep2351rcuc/210:28:182
190852440,3sleep119086-21vmstat07:48:221
190852440,3sleep119086-21vmstat07:48:221
190852440,3sleep119086-21vmstat07:48:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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