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2026-08-19 - 21:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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 100 highest latencies:
System rackeslot6s.osadl.org (updated Wed Aug 19, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
278184991105,99cyclictest0-21swapper/007:15:020
278184998882,4cyclictest131ktimers/011:25:010
278187997439,14cyclictest301414-21apt-get09:25:021
27818499711,3cyclictest0-21swapper/008:35:010
278187996354,4cyclictest298783-21apt-get09:10:011
278187996354,4cyclictest298783-21apt-get09:10:011
278187995922,9cyclictest329456-21apt-key12:10:011
278187995851,4cyclictest231ktimers/112:00:011
278187995748,5cyclictest321000-21munin-plugin-st11:20:001
278187995730,14cyclictest0-21swapper/107:15:121
278184995727,26cyclictest0-21swapper/011:40:300
278184995636,17cyclictest167350irq/118-8000000.ethernet-tx008:50:240
278187995433,12cyclictest316889-21apt-get10:55:181
278187995229,14cyclictest0-21swapper/112:10:111
278187995138,9cyclictest0-21swapper/111:15:011
278187995134,11cyclictest278351-21apt-get07:10:161
278184995143,5cyclictest0-21swapper/007:20:010
27818499511,2cyclictest0-21swapper/010:40:010
27818499511,2cyclictest0-21swapper/010:40:010
278188995037,8cyclictest307411-21sendmail10:00:002
278188995037,8cyclictest307411-21sendmail10:00:002
278187995026,15cyclictest334209-21/usr/sbin/munin12:35:221
278187995024,18cyclictest281697-21grep07:25:281
278184995042,5cyclictest167350irq/118-8000000.ethernet-tx010:35:000
27818899497,25cyclictest30-21rcuc/212:05:182
27818899494,20cyclictest0-21swapper/208:05:012
278187994932,9cyclictest0-21swapper/111:30:191
278187994932,10cyclictest0-21swapper/109:35:221
278187994931,9cyclictest282226-21/usr/sbin/munin07:30:201
278187994929,13cyclictest0-21swapper/109:55:151
278187994929,13cyclictest0-21swapper/109:55:151
278187994927,12cyclictest0-21swapper/107:20:291
278187994927,11cyclictest313937-21ptp4l-jitter10:35:271
278187994927,11cyclictest313937-21ptp4l-jitter10:35:271
278187994925,15cyclictest331186-21/usr/sbin/munin12:15:311
278187994922,19cyclictest295363-21grep08:45:301
278187994921,20cyclictest324730-21fschecks_time11:40:211
278184994931,15cyclictest167350irq/118-8000000.ethernet-tx011:15:180
278184994918,28cyclictest0-21swapper/008:30:000
278188994841,4cyclictest318386-21munin-plugin-st11:05:002
278188994835,8cyclictest0-21swapper/212:15:002
278187994831,12cyclictest0-21swapper/110:30:121
278187994828,12cyclictest0-21swapper/112:25:151
278187994823,17cyclictest286797-21head07:55:281
278187994823,14cyclictest283757-21/usr/sbin/munin07:40:161
278184994811,33cyclictest0-21swapper/009:35:280
278188994740,4cyclictest0-21swapper/210:10:002
278187994729,10cyclictest0-21swapper/107:35:301
278187994726,10cyclictest0-21swapper/110:20:131
278187994725,13cyclictest0-21swapper/109:45:161
278187994724,13cyclictest0-21swapper/110:50:131
278187994718,18cyclictest0-21swapper/111:25:141
278184994728,9cyclictest298814-21latency_hist09:10:010
278184994728,9cyclictest298814-21latency_hist09:10:010
278187994635,5cyclictest0-21swapper/111:00:231
278187994631,8cyclictest288902-21ssh08:10:181
278187994628,9cyclictest310488-21/usr/sbin/munin10:15:281
278187994628,9cyclictest304431-21grep09:40:211
278187994627,11cyclictest308857-21/usr/sbin/munin10:05:281
278187994626,12cyclictest312001-21fschecks_time10:25:201
278187994626,10cyclictest300775-21munin-node09:20:111
278187994625,14cyclictest326594-21/usr/sbin/munin11:50:241
278187994623,14cyclictest0-21swapper/111:05:261
278187994623,12cyclictest0-21swapper/108:20:141
278187994621,14cyclictest0-21swapper/110:10:121
27818799460,18cyclictest0-21swapper/110:50:011
278184994618,24cyclictest0-21swapper/007:25:010
27818499461,39cyclictest0-21swapper/011:00:010
278187994534,7cyclictest292762-21grep08:30:281
278187994529,12cyclictest333414-21/usr/sbin/munin12:30:251
278187994529,12cyclictest333414-21/usr/sbin/munin12:30:241
278187994528,9cyclictest289763-21sh08:15:211
278187994528,12cyclictest0-21swapper/108:55:131
278187994528,12cyclictest0-21swapper/108:55:131
278187994528,10cyclictest331946-21/usr/sbin/munin12:20:281
278187994525,13cyclictest295713-21/usr/sbin/munin08:50:201
278187994522,16cyclictest306506-21head09:50:261
278184994537,4cyclictest167350irq/118-8000000.ethernet-tx007:40:010
278184994535,5cyclictest301432-21apt-config09:25:000
27818499451,12cyclictest0-21swapper/008:10:010
278188994436,5cyclictest324376-21run-parts11:40:012
278188994433,7cyclictest334537-21unixbench_singl12:35:292
278188994430,9cyclictest0-21swapper/208:40:292
278188994429,9cyclictest0-21swapper/211:05:212
27818899441,33cyclictest2215812-1kworker/2:0H+kblockd09:44:232
278187994435,5cyclictest325433-21apt-get11:45:141
278187994435,5cyclictest325433-21apt-get11:45:131
278187994432,7cyclictest0-21swapper/111:20:271
278187994431,9cyclictest0-21swapper/107:45:141
278187994431,9cyclictest0-21swapper/107:45:141
278187994429,10cyclictest0-21swapper/108:35:121
278187994428,10cyclictest297380-21diskstats09:00:181
278187994426,8cyclictest285461-21/usr/sbin/munin07:50:181
278184994433,8cyclictest300561-21sendmail09:20:010
278184994431,10cyclictest294854-21fschecks_count08:45:200
27818499441,5cyclictest285036-21awk07:45:290
27818499441,5cyclictest285036-21awk07:45:290
27818499441,41cyclictest0-21swapper/010:40:290
278188994336,4cyclictest0-21swapper/210:55:002
278188994323,15cyclictest311ktimers/207:20:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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