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2026-01-12 - 00:45

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 50 highest latencies:
System rackeslot6s.osadl.org (updated Sun Jan 11, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3019815991078,67cyclictest3037799-21apt-get08:55:002
301981399867,25cyclictest3073314-21/usr/sbin/munin12:25:201
301981299789,18cyclictest3047179-21apt-get09:50:020
3019815996931,33cyclictest0-21swapper/211:15:302
301981399688,23cyclictest0-21swapper/110:40:021
3019815996523,36cyclictest3058389-21grep10:50:292
3019815996438,22cyclictest3036961-21munin-plugin-st08:50:002
301981599603,32cyclictest0-21swapper/207:25:012
301981299604,25cyclictest0-21swapper/011:45:010
3019815995932,22cyclictest0-21swapper/209:45:292
301981599585,45cyclictest0-21swapper/208:10:282
3019815995725,26cyclictest3061704-21grep11:10:292
3019815995626,22cyclictest0-21swapper/207:55:282
3019815995623,26cyclictest3074151-21/usr/sbin/munin12:30:272
301981599557,39cyclictest0-21swapper/209:15:212
301981599551,46cyclictest3058744-21cut10:55:192
3019815995512,36cyclictest3056144-21fschecks_time10:40:192
301981399555,21cyclictest22-21rcuc/110:35:021
301981599545,40cyclictest0-21swapper/212:25:302
301981599543,42cyclictest3035214-21grep08:35:292
301981599542,44cyclictest0-21swapper/211:35:282
301981599541,2cyclictest0-21swapper/207:20:012
301981599541,2cyclictest0-21swapper/207:20:012
301981599534,39cyclictest0-21swapper/210:20:172
301981599534,39cyclictest0-21swapper/210:20:162
301981599532,44cyclictest3065114-21unixbench_singl11:30:272
301981599532,42cyclictest3033039-21lsblk08:25:222
3019813995342,6cyclictest3032630-21grep08:20:291
3019812995338,10cyclictest3066215-21apt-get11:40:020
301981599524,40cyclictest0-21swapper/212:35:272
3019815995226,20cyclictest0-21swapper/208:35:022
3019815995226,20cyclictest0-21swapper/208:35:022
3019815995219,25cyclictest0-21swapper/209:10:212
3019815995216,30cyclictest0-21swapper/211:20:282
3019815995215,31cyclictest3044062-21dropbear09:30:172
301981599515,39cyclictest0-21swapper/209:20:302
301981599515,37cyclictest0-21swapper/209:55:272
301981599514,38cyclictest3050562-21grep10:05:282
301981599513,5cyclictest3068587-21grep11:50:282
301981599512,42cyclictest3069856-21sh12:00:202
3019815995119,27cyclictest3025184-21wc07:40:002
301981599511,39cyclictest3054027-21grep10:25:302
301981599511,15cyclictest3026180-21apt-get07:45:162
301981599511,15cyclictest3026180-21apt-get07:45:152
301981299513,16cyclictest20850irq/208-8000000.ethernet07:50:010
301981299513,16cyclictest20850irq/208-8000000.ethernet07:50:010
301981599509,33cyclictest3020784-21fschecks_time07:15:012
301981599508,34cyclictest3072911-21/usr/sbin/munin12:20:242
301981599507,35cyclictest3038196-21fschecks_count08:55:192
301981599504,39cyclictest0-21swapper/209:45:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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