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2026-06-11 - 05:34

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 Thu Jun 11, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1907479997967,4cyclictest0-21swapper/019:20:100
1907482997530,40cyclictest0-21swapper/120:00:301
1907483997414,22cyclictest32-21ksoftirqd/221:20:012
1907482996943,22cyclictest1909420-21sendmail19:20:001
1907482996427,7cyclictest1660-21snmpd20:30:241
1907482996322,6cyclictest1957021-21grep23:55:301
1907482996229,28cyclictest1947744-21grep23:00:281
1907482996220,4cyclictest0-21swapper/100:25:171
1907482996120,4cyclictest0-21swapper/122:25:271
1907482996120,4cyclictest0-21swapper/122:25:271
190748399605,20cyclictest832-21systemd-network22:50:002
190747999604,22cyclictest15-21rcuc/022:10:000
1907483995911,8cyclictest1963917-21apt-get00:40:012
1907482995925,5cyclictest0-21swapper/120:35:271
1907482995923,4cyclictest0-21swapper/121:45:231
190748299592,30cyclictest1660-21snmpd20:10:191
190748299592,30cyclictest1660-21snmpd20:10:191
1907482995920,5cyclictest0-21swapper/100:35:191
190748399588,17cyclictest1951361-21/usr/sbin/munin23:25:192
1907482995825,26cyclictest0-21swapper/121:55:201
1907482995820,9cyclictest0-21swapper/120:15:191
1907483995721,29cyclictest1953041-21/usr/sbin/munin23:35:182
190747999571,51cyclictest0-21swapper/019:10:100
1907482995622,28cyclictest0-21swapper/122:10:261
1907482995622,28cyclictest0-21swapper/122:10:261
1907482995621,8cyclictest0-21swapper/123:45:001
1907482995523,8cyclictest1914021-21/usr/sbin/munin19:45:241
1907482995522,7cyclictest0-21swapper/121:35:011
1907482995520,5cyclictest0-21swapper/121:25:191
1907479995548,4cyclictest20850irq/208-8000000.ethernet19:45:230
1907482995417,5cyclictest0-21swapper/100:15:201
1907483995145,4cyclictest0-21swapper/220:00:202
1907479995139,8cyclictest1958264-21cut00:05:200
190747999513,41cyclictest1963961-21latency_hist00:40:000
190748399506,19cyclictest1914860-21/usr/sbin/munin19:50:182
1907482995041,6cyclictest1913824-21munin-plugin-st19:45:001
1907482995023,4cyclictest0-21swapper/123:20:011
190748299502,2cyclictest0-21swapper/123:25:011
190748299502,2cyclictest0-21swapper/123:25:011
1907479995037,11cyclictest1955376-21sh23:50:000
1907483994936,5cyclictest0-21swapper/219:45:012
190748399493,16cyclictest0-21swapper/200:25:012
190748299492,6cyclictest0-21swapper/122:25:021
190747999497,15cyclictest15-21rcuc/020:35:000
1907479994940,6cyclictest0-21swapper/022:00:010
1907483994837,7cyclictest0-21swapper/200:35:012
1907483994817,25cyclictest1943764-21/usr/sbin/munin22:40:172
190748399481,18cyclictest0-21swapper/223:10:012
190747999483,8cyclictest1920041-21sh20:20:180
1907479994838,6cyclictest1950236-21grep23:15:300
190748399472,16cyclictest0-21swapper/222:10:012
190748399471,19cyclictest0-21swapper/223:15:012
190748299478,2cyclictest0-21swapper/119:35:011
1907483994625,13cyclictest0-21swapper/219:15:292
1907482994610,9cyclictest1945442-21/usr/sbin/munin22:50:191
1907479994639,4cyclictest20650irq/252-8000000.ethernet19:55:160
190747999462,40cyclictest0-21swapper/020:30:010
1907483994533,7cyclictest0-21swapper/219:20:272
190748399451,26cyclictest0-21swapper/219:35:022
1907479994538,3cyclictest0-21swapper/000:30:100
1907479994537,4cyclictest167350irq/118-8000000.ethernet-tx022:56:350
1907479994524,12cyclictest15-21rcuc/020:15:020
1907483994439,3cyclictest311ktimers/222:55:192
190748299442,35cyclictest1955317-21unixbench_singl23:45:291
1907479994437,4cyclictest20650irq/252-8000000.ethernet21:05:120
1907479994437,4cyclictest20650irq/252-8000000.ethernet21:05:120
1907479994437,4cyclictest167350irq/118-8000000.ethernet-tx019:50:170
1907479994437,3cyclictest167350irq/118-8000000.ethernet-tx021:20:260
190747999443,6cyclictest0-21swapper/023:35:010
190747999442,6cyclictest1935290-21diskstats21:50:180
190747999441,40cyclictest0-21swapper/020:50:000
190748399437,13cyclictest311ktimers/222:35:002
1907483994333,6cyclictest1959540-21unixbench_singl00:10:272
1907483994328,9cyclictest1926387-21grep20:55:282
1907483994317,14cyclictest0-21swapper/221:50:142
1907483994316,16cyclictest0-21swapper/200:05:132
1907482994332,7cyclictest0-21swapper/100:20:261
190747999432,5cyclictest1912008-21users19:30:280
1907479994320,21cyclictest0-21swapper/019:25:190
1907483994232,6cyclictest0-21swapper/219:10:272
1907483994228,8cyclictest0-21swapper/220:15:012
1907483994228,8cyclictest0-21swapper/220:15:012
1907483994218,18cyclictest0-21swapper/223:40:122
1907483994214,16cyclictest0-21swapper/223:55:142
1907482994220,8cyclictest1958955-21/usr/sbin/munin00:10:171
190747999424,5cyclictest1923920-21grep20:40:290
1907479994235,4cyclictest131ktimers/021:30:010
1907479994234,5cyclictest1959628-21cat00:15:010
1907479994233,6cyclictest20850irq/208-8000000.ethernet00:00:000
190747999421,39cyclictest0-21swapper/019:35:160
1907483994129,8cyclictest1920489-21grep20:20:272
1907482994133,4cyclictest1933338-21sendmail21:40:001
1907482994127,9cyclictest0-21swapper/121:50:281
1907479994137,2cyclictest0-21swapper/023:50:100
1907479994134,4cyclictest167350irq/118-8000000.ethernet-tx021:30:120
1907479994133,5cyclictest0-21swapper/021:40:000
1907479994126,10cyclictest0-21swapper/021:20:010
190747999412,4cyclictest1913481-21meminfo19:40:240
190747999411,38cyclictest0-21swapper/023:25:020
190747999411,38cyclictest0-21swapper/023:25:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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