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2026-05-22 - 21:51

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 May 22, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3254221290,3chrt32543-21if_eth022:26:010
640621220,2chrt6407-21irqrtprio21:46:490
889521170,3chrt8893-21grep00:16:280
409421150,2chrt4093-21seq22:31:430
602721140,2chrt6028-21ssh23:23:420
191621140,2chrt1918-21proc_pri23:17:250
1597821140,2chrt15963-21ntpq00:26:240
2184121120,3chrt21839-21sendmail_mailqu23:47:140
2471021110,2chrt24704-21awk19:45:010
1172221110,2chrt11723-21sleep23:32:040
789921100,2chrt7900-21sh19:16:350
1587321100,1sleep015872-21seq21:12:330
2925821090,3chrt29259-21sleep23:10:130
1462821070,2chrt14629-21sh22:47:210
2220021060,2chrt22199-21sh22:10:390
1863921050,2sleep018642-21aten2.4_rfpower22:05:310
2418821040,2sleep024189-21seq00:39:010
732221030,3chrt7323-21sleep20:08:100
59302950,2sleep05932-21chrt22:35:060
42242950,2sleep04226-21chrt00:10:020
158472940,2sleep015848-21chrt23:38:230
178172910,1sleep017814-21python322:52:180
327212900,2sleep032724-21sendmail_mailqu19:56:240
113352890,3chrt11315-21/usr/sbin/munin20:15:020
283392860,2chrt28122-21apt-get19:50:350
272832810,2sleep027282-21seq20:40:240
286602740,3sleep028656-21ssh23:57:290
23742749,53sleep02378-21sleep19:08:320
248612730,1sleep024862-21chrt23:02:570
181792730,2sleep018181-21sed00:30:150
67512710,1sleep06752-21chrt23:25:080
314972690,2sleep031498-21df_inode21:36:150
263262680,2sleep026327-21seq22:16:180
117422680,2sleep011743-21seq22:43:210
60612670,1sleep06062-21seq19:15:020
221232670,1sleep022124-21ssh22:59:240
128872670,2sleep012891-21fschecks_count19:25:350
169082650,2sleep016909-21chrt22:02:180
100542640,2sleep010055-21sh21:51:540
57072603,7sleep05721-21ntpq20:56:480
172302603,8sleep017234-21sleep23:40:480
260282583,46sleep026035-21users21:27:310
242612583,45sleep024268-21sleep20:35:300
184812570,2sleep018482-21chrt19:35:000
19302563,6sleep01931-21ssh21:40:330
146682563,7sleep014619-21apt-get20:20:200
13362562,8sleep01340-21df_inode20:50:270
88592553,8sleep08922-21mailstats21:01:250
223052550,2sleep022307-21mailstats20:31:240
290502542,44sleep029058-21/usr/sbin/munin21:32:180
216032543,42sleep021672-21/usr/sbin/munin21:21:080
252952533,7sleep025299-21ntpq23:52:290
127232530,2sleep012724-21chrt21:56:060
125942534,40sleep012590-21ntpq00:21:210
97412513,7sleep09745-21diskstats19:20:370
310402513,6sleep030286-21/usr/sbin/munin20:46:050
278912510,1sleep027894-21chrt23:07:270
183642510,2sleep018368-21tr21:16:160
177532502,7sleep017756-21runrttasks20:25:170
128512500,2sleep012896-21processes20:16:230
186582493,37sleep018640-21apt-get19:35:140
2974904819,23cyclictest0-21swapper00:14:300
264262460,3chrt26424-21/usr/sbin/munin19:46:270
297490425,9cyclictest12142-21ntpq21:06:440
297490407,27cyclictest2923-21memory20:00:470
297490405,18cyclictest0-21swapper00:00:330
2974903915,16cyclictest28519-21ssh22:20:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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