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2026-09-04 - 05:04

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 the highest latencies:
System rackfslot4s.osadl.org (updated Fri Sep 04, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2427621240,3chrt24275-21seq23:23:420
495821230,3chrt4956-21grep21:17:270
902621210,2chrt9023-21ld22:11:590
3255521210,2chrt32546-21diskstats21:10:500
2496221210,4chrt24947-21ntpq20:05:560
1950821210,2chrt19511-21cron21:40:000
1018921190,2chrt10190-21sleep21:25:530
2760421160,3chrt27605-21if_eth020:10:400
677121150,2chrt6772-21seq22:08:540
328621140,2chrt3288-21grep23:40:520
2716621140,2chrt27167-21aten2.4_rfpower21:51:210
1913721140,2chrt19135-21modprobe00:05:000
1258721140,3chrt12586-21seq19:46:040
1986121130,3chrt19862-21sleep22:28:220
646721120,3chrt6469-21sleep23:45:420
1616221090,3chrt16163-21chrt21:35:000
2051521080,1sleep020516-21if_err_eth021:41:060
2758821040,2chrt27589-21sh23:28:400
3190521010,1sleep031907-21cat23:35:190
1574121000,2sleep015743-21ld19:51:070
132482950,2sleep013251-21fschecks_time23:55:520
190762930,2sleep019078-21if_err_can023:16:010
170072920,2sleep017010-21sed23:12:230
309482860,2sleep030949-21sh00:22:030
309422860,2sleep030943-21irqrtprio20:15:440
64202820,2sleep06421-21seq21:20:240
217712820,2sleep021772-21seq20:00:490
95712810,1sleep09573-21grep23:01:160
82822760,1sleep08281-21date19:40:040
22006907613,53cyclictest23883-21processes20:56:230
262922750,2sleep026293-21chrt22:37:540
22006907413,42cyclictest29947-21ssh21:55:170
22006907316,46cyclictest12347-21rm23:05:540
22006907313,51cyclictest3561-21seq22:04:100
126252730,1sleep012624-21date23:55:060
2200690726,54cyclictest1376-21ssh00:26:180
2200690725,57cyclictest26499-21df_inode21:01:240
2200690725,56cyclictest27383-21ntpq00:16:400
2200690725,48cyclictest22472-21munin-run00:10:000
22006907218,46cyclictest29936-21/usr/sbin/munin19:21:280
22006907215,45cyclictest22646-21/usr/sbin/munin00:12:250
235432710,2sleep023544-21chrt22:34:160
232852710,2sleep023280-21telnet21:45:330
2200690715,45cyclictest15651-21seq22:21:540
129902710,1sleep012991-21seq22:17:540
2200690705,55cyclictest29013-21hddtemp_smartct23:30:590
2200690704,55cyclictest11533-21mailstats20:36:240
2200690704,51cyclictest3743-21runrttasks00:30:350
2200690695,54cyclictest6657-21ssh22:56:590
2200690694,54cyclictest23772-21users19:11:300
2200690693,57cyclictest3627-21python319:31:280
2200690693,56cyclictest8722-21sshd19:40:330
22006906911,50cyclictest31659-21seq21:09:300
22006906911,49cyclictest10089-21latency_hist00:40:050
2200690687,50cyclictest19390-21apt-get20:50:140
2200690684,55cyclictest7198-21telnet20:30:240
2200690684,54cyclictest308142sleep022:45:260
2200690684,47cyclictest1836-21apt-get22:51:070
2200690684,46cyclictest17810-21aten2.4_rfpower19:55:250
2200690683,46cyclictest28962-21chrt22:41:560
2200690683,46cyclictest17373-21ntpq20:45:570
216132688,46sleep021617-21sleep19:09:100
2200690675,52cyclictest4885-21ntpq20:25:500
2200690674,54cyclictest1827-21ntpq20:20:550
2200690674,46cyclictest26864-21seq19:16:270
2200690674,44cyclictest31802-21sleep19:25:280
2200690674,43cyclictest13561-21entropy20:40:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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