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2026-03-14 - 04:51

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 Sat Mar 14, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2959328991053,2cyclictest0-21swapper/023:55:010
295932899791,8cyclictest2971029-21tune2fs20:15:200
295932899762,8cyclictest2964479-21/usr/sbin/munin19:35:270
295932899742,3cyclictest2992501-21apt-get22:20:150
295932899732,6cyclictest2997710-21cut22:50:210
295932899721,6cyclictest2976353-21/usr/sbin/munin20:45:220
295932899721,6cyclictest2976353-21/usr/sbin/munin20:45:210
2959328997122,7cyclictest20650irq/252-8000000.ethernet21:50:110
2959328997122,7cyclictest20650irq/252-8000000.ethernet21:50:110
295932899711,5cyclictest1660-21snmpd00:25:020
295932899702,4cyclictest3000399-21meminfo23:05:240
295932899702,4cyclictest2977927-21fschecks_time20:55:200
2959331996856,7cyclictest0-21swapper/122:45:311
2959328996828,8cyclictest2960151-21munin-node19:15:010
295932899681,5cyclictest2990521-21apt-config22:10:010
295932899676,4cyclictest3002174-21processes23:15:240
2959328996633,30cyclictest20850irq/208-8000000.ethernet00:10:280
2959328996535,27cyclictest3004663-21phc2sys-jitter23:30:240
2959328996524,16cyclictest0-21swapper/023:20:250
295932899651,4cyclictest2996779-21/usr/sbin/munin22:45:190
295932899641,36cyclictest0-21swapper/000:10:010
295933299637,26cyclictest32-21ksoftirqd/223:10:182
295933299632,22cyclictest2990506-21apt-get22:10:022
2959331996348,5cyclictest231ktimers/120:15:011
295932899635,5cyclictest2966333-21apt-get19:50:010
295932899634,4cyclictest1258-21in:imuxsock23:10:010
2959328996328,30cyclictest0-21swapper/022:55:290
2959328996326,6cyclictest3015959-21grep00:35:270
295932899631,10cyclictest2980947-21latency_hist21:15:010
2959328996310,24cyclictest131ktimers/020:10:230
2959332996247,12cyclictest311ktimers/222:15:192
2959332996211,17cyclictest30-21rcuc/220:35:012
295932899621,6cyclictest2965567-21cat19:45:010
2959332996113,27cyclictest32-21ksoftirqd/223:50:012
2959328996129,4cyclictest20850irq/208-8000000.ethernet21:05:180
295932899611,6cyclictest2966694-21diskstats19:50:190
295932899611,4cyclictest3003901-21ptp4l-jitter23:25:270
2959328996035,22cyclictest2988656-21apt-get22:00:000
295932899602,4cyclictest0-21swapper/022:25:180
295932899601,4cyclictest2987040-21grep21:50:010
2959332995952,4cyclictest32-21ksoftirqd/223:20:172
2959328995929,4cyclictest20850irq/208-8000000.ethernet21:30:170
295932899591,4cyclictest2961778-21memory19:20:220
295932899581,6cyclictest3012111-21tune2fs00:15:180
2959332995718,13cyclictest32-21ksoftirqd/220:45:172
2959332995718,13cyclictest32-21ksoftirqd/220:45:172
295932899571,30cyclictest2973208-21apt-config20:30:000
2959328995628,4cyclictest20850irq/208-8000000.ethernet22:05:020
2959328995628,4cyclictest20850irq/208-8000000.ethernet22:05:010
2959332995517,15cyclictest30-21rcuc/220:20:012
295933199543,38cyclictest0-21swapper/119:25:201
2959332995245,4cyclictest2996523-21munin-plugin-st22:45:002
2959328995233,15cyclictest131ktimers/019:55:250
2959331995142,6cyclictest2974108-21munin-plugin-st20:35:001
2959328995129,4cyclictest0-21swapper/020:23:330
2959328995129,4cyclictest0-21swapper/020:23:330
2959328995129,3cyclictest0-21swapper/020:50:160
2959331995038,7cyclictest2961149-21grep19:15:271
2959331995011,15cyclictest14-21rcu_preempt19:50:011
2959328995032,3cyclictest0-21swapper/019:25:010
2959332994939,5cyclictest3008332-21munin-plugin-st23:55:012
295933299493,25cyclictest32-21ksoftirqd/221:45:012
295932899492,7cyclictest3008400-21latency_hist23:55:000
2959332994834,9cyclictest0-21swapper/200:40:002
295933199483,34cyclictest3002310-21unixbench_multi23:15:261
2959331994827,10cyclictest0-21swapper/122:35:001
295933299479,9cyclictest32-21ksoftirqd/219:40:012
2959331994734,9cyclictest3012652-21sendmail00:20:001
2959328994728,4cyclictest20850irq/208-8000000.ethernet22:30:200
2959328994728,4cyclictest20850irq/208-8000000.ethernet00:30:150
2959332994634,7cyclictest2963680-21grep19:30:272
295933199469,16cyclictest0-21swapper/122:45:011
295932899461,2cyclictest0-21swapper/000:05:000
2959332994534,7cyclictest2973206-21grep20:30:002
2959332994528,10cyclictest3009178-21sendmail00:00:012
2959331994531,10cyclictest0-21swapper/122:25:281
2959331994530,9cyclictest0-21swapper/123:45:271
2959328994533,4cyclictest0-21swapper/019:15:030
2959332994432,7cyclictest0-21swapper/219:15:012
295933199447,11cyclictest0-21swapper/119:15:011
2959331994425,10cyclictest0-21swapper/119:50:281
295933199441,6cyclictest2976627-21unixbench_multi20:45:271
295933199441,6cyclictest2976627-21unixbench_multi20:45:271
295933199441,4cyclictest0-21swapper/122:40:011
2959328994437,3cyclictest0-21swapper/021:35:250
2959328994430,9cyclictest0-21swapper/020:00:270
2959328994429,10cyclictest0-21swapper/021:00:280
295932899441,37cyclictest0-21swapper/022:15:020
2959332994319,13cyclictest0-21swapper/222:10:132
2959331994333,6cyclictest3015096-21grep00:30:271
2959332994227,9cyclictest0-21swapper/222:50:252
2959331994234,5cyclictest0-21swapper/123:10:271
2959331994231,6cyclictest0-21swapper/119:30:281
2959331994230,9cyclictest0-21swapper/122:25:001
2959331994226,10cyclictest0-21swapper/121:05:161
295932899425,9cyclictest2982213-21fschecks_count21:20:190
2959328994228,9cyclictest2999780-21grep23:00:260
2959328994228,9cyclictest2999780-21grep23:00:260
295932899422,34cyclictest3006545-21sed23:40:290
295932899422,34cyclictest3006545-21sed23:40:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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