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2026-07-06 - 22:19

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 Mon Jul 06, 2026 12:44:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
325421200,2chrt0-21swapper/210:48:242
325421200,2chrt0-21swapper/210:48:242
325421200,2chrt0-21swapper/210:48:242
2703921080,2chrt27038-21sshd10:23:311
2703921080,2chrt27038-21sshd10:23:311
2703921080,2chrt27038-21sshd10:23:311
4102890,2sleep1413-21mailstats10:38:341
4102890,2sleep1413-21mailstats10:38:341
39502860,2chrt3948-21users12:13:370
39502860,2chrt3948-21users12:13:370
254142830,2sleep125415-21/usr/sbin/munin10:18:321
254142830,2sleep125415-21/usr/sbin/munin10:18:321
254142830,2sleep125415-21/usr/sbin/munin10:18:321
97032650,2chrt0-21swapper/311:03:333
97032650,2chrt0-21swapper/311:03:333
97032650,2chrt0-21swapper/311:03:333
34322620,2chrt0-21swapper/307:53:343
34322620,2chrt0-21swapper/307:53:343
214432620,2chrt21442-21df_inode08:43:251
214432620,2chrt21442-21df_inode08:43:251
179572620,3chrt0-21swapper/308:33:263
179572620,3chrt0-21swapper/308:33:263
115142560,3sleep30-21swapper/311:08:313
115142560,3sleep30-21swapper/311:08:313
139052550,2chrt13026-21latency_hist09:48:291
139052550,2chrt13026-21latency_hist09:48:291
139052550,2chrt13026-21latency_hist09:48:291
21382540,2chrt2139-21fschecks_count09:18:260
16192500,3sleep11622-21proc_pri12:08:351
16192500,3sleep11622-21proc_pri12:08:351
16192500,3sleep11622-21proc_pri12:08:351
101362500,3chrt0-21swapper/209:38:292
101362500,3chrt0-21swapper/209:38:292
101362500,3chrt0-21swapper/209:38:292
318742480,2sleep131876-21latency_hist10:38:221
318742480,2sleep131876-21latency_hist10:38:221
318742480,2sleep131876-21latency_hist10:38:221
20029994721,24cyclictest30496-21switchtime11:58:380
20029994721,24cyclictest30496-21switchtime11:58:380
20029994721,24cyclictest10361-21fschecks_count12:33:260
106082470,2sleep30-21swapper/309:38:353
106082470,2sleep30-21swapper/309:38:353
106082470,2sleep30-21swapper/309:38:353
87782460,3sleep20-21swapper/208:08:292
87782460,3sleep20-21swapper/208:08:292
320212450,2sleep20-21swapper/207:43:322
320212450,2sleep20-21swapper/207:43:322
320212450,2sleep20-21swapper/207:43:322
82772440,2sleep08294-21latency_hist12:28:250
82772440,2sleep08294-21latency_hist12:28:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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