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2026-09-24 - 09:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of all highest latencies:
System rackfslot4s.osadl.org (updated Thu Sep 24, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2469821360,3chrt24697-21/usr/sbin/munin00:31:430
2259321320,2sleep022592-21seq23:40:090
677121240,3chrt4724-21/usr/sbin/munin22:27:250
1518221220,2chrt15176-21ntpq21:51:230
1827221210,2chrt18271-21sleep00:21:350
1410521210,2sleep014106-21chrt22:39:070
440721200,2chrt4409-21fschecks_time00:01:260
1300421190,3chrt12985-21diskstats23:26:160
2975621170,5chrt29757-21runrttasks22:13:380
1800721160,3chrt18006-21/usr/sbin/munin23:33:080
3148521130,2sleep031486-21chrt23:52:560
804421120,2chrt8045-21/usr/sbin/munin20:50:500
2355221110,2chrt23550-21smartctl21:16:020
1083021100,2chrt10831-21sleep20:55:440
723921090,2chrt7234-21ps23:17:130
143621080,3chrt1437-21seq23:08:440
742121070,2chrt7420-21basename21:40:300
1208621070,2chrt12087-21sh19:13:490
1326721050,3chrt13268-21sh20:06:410
9602990,2sleep0964-21rm23:56:040
155202990,2chrt15521-21sh21:03:070
30682970,2sleep03072-21sed23:11:110
6092950,2sleep0611-21sed21:30:130
21422910,1sleep02145-21sort19:50:040
86482880,2sleep08650-21grep00:07:150
292022870,2sleep029203-21rm23:01:220
103392870,2sleep010337-21aten2.4_rfpower00:10:280
23762860,2sleep02378-21seq19:50:250
259442820,2sleep025945-21chrt22:56:270
11922820,1sleep01193-21chrt20:40:270
316682810,1sleep031670-21mailstats20:36:230
200962780,2sleep020098-21cut21:10:570
229562770,1sleep022957-21chrt22:03:130
200472770,2sleep020048-21chrt19:25:580
169942770,2sleep016996-21ntpq19:21:030
252792750,2sleep025278-21ld20:26:160
144482740,2sleep014452-21sed00:16:040
271692660,1sleep027170-21chrt20:30:250
300962630,1sleep030097-21awk21:25:530
256002613,47sleep023890-21/usr/sbin/munin22:07:120
291642580,2sleep029214-21fschecks_count19:41:270
232152580,2sleep023217-21grep22:52:210
158302584,45sleep015837-21ld20:11:040
263362574,8sleep026335-21df_inode23:45:410
186912574,43sleep018684-21ntpq21:56:440
9470905622,26cyclictest0-21swapper22:22:220
137402563,42sleep013746-21ntpq19:15:540
306182554,40sleep030538-21apt-get22:15:270
181012553,6sleep018084-21ssh22:45:260
234172542,6sleep023375-21ssh00:30:080
277452533,7sleep027736-21ssh21:21:520
59042523,8sleep05947-21if_eth019:55:410
188782523,7sleep018875-21ntpq20:16:010
100452524,41sleep010041-21ntpq23:21:160
199062513,40sleep018927-21apt-get23:36:090
169122500,3chrt16909-21/usr/sbin/munin21:05:390
9470904819,22cyclictest0-21swapper22:33:190
9470904817,23cyclictest0-21swapper00:38:310
57462483,37sleep05782-21/usr/sbin/munin21:37:150
161512472,37sleep016137-21ssh22:41:440
745624510,19sleep07458-21ntpq19:05:410
263982450,3chrt26399-21sh19:36:130
947090445,19cyclictest6890-21munin-run20:50:010
221352444,32sleep022133-21ntp_states20:21:100
137662430,2sleep013767-21chrt21:50:020
947090424,10cyclictest22928-21irqstats19:30:470
947090415,17cyclictest11383-21munin-run20:05:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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