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2026-08-11 - 09:51

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 Tue Aug 11, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
117937999881,60cyclictest0-21swapper/020:20:020
117937999864,50cyclictest1233461-21gpgv00:25:010
1179379998051,23cyclictest0-21swapper/019:20:120
117937999781,47cyclictest0-21swapper/023:00:010
117937999711,43cyclictest0-21swapper/023:55:010
117937999702,4cyclictest1180301-21latency_hist19:15:000
1179379996926,36cyclictest0-21swapper/021:10:020
117937999691,11cyclictest1200627-21irqstats21:10:230
1179379996635,27cyclictest20650irq/252-8000000.ethernet20:25:230
117937999663,3cyclictest0-21swapper/020:45:200
1179379996633,27cyclictest1236084-21munin-plugin-st00:40:000
117937999663,2cyclictest0-21swapper/019:50:010
117937999663,2cyclictest0-21swapper/019:50:010
1179379996631,29cyclictest0-21swapper/022:00:170
1179379996544,16cyclictest20650irq/252-8000000.ethernet19:15:010
117937999642,6cyclictest1227452-21munin-run23:50:000
117937999633,31cyclictest1186389-21munin-run19:50:000
1179379996249,7cyclictest1210725-21grep22:10:200
1179379996238,20cyclictest20650irq/252-8000000.ethernet22:35:260
117937999621,5cyclictest1229348-21sed00:00:020
1179379996132,24cyclictest1198341-21grep20:55:280
117937999611,4cyclictest1221934-21perl23:15:240
1179379996045,9cyclictest0-21swapper/000:05:010
117937999602,54cyclictest1660-21snmpd20:50:220
117937999602,54cyclictest1660-21snmpd20:50:220
1179379996018,37cyclictest0-21swapper/023:30:280
117937999601,56cyclictest0-21swapper/019:25:280
117937999601,3cyclictest0-21swapper/020:00:000
117937999592,3cyclictest1234044-21memory00:25:240
1179379995916,35cyclictest0-21swapper/019:40:180
1179379995835,20cyclictest20850irq/208-8000000.ethernet23:35:260
117937999581,54cyclictest1220967-21diskstats23:10:180
117937999581,4cyclictest1222655-21df23:20:180
1179382995748,6cyclictest1183852-21munin-plugin-st19:35:001
117938299574,18cyclictest0-21swapper/123:30:011
117937999571,4cyclictest0-21swapper/021:30:220
117937999571,2cyclictest0-21swapper/021:55:000
1179379995626,22cyclictest0-21swapper/020:10:270
117937999561,3cyclictest1184121-21diskstats19:35:170
1179379995524,25cyclictest20850irq/208-8000000.ethernet21:40:120
117937999551,5cyclictest1232395-21rt-features00:15:300
117937999551,5cyclictest1232395-21rt-features00:15:300
117937999551,4cyclictest0-21swapper/020:05:200
117937999551,3cyclictest1205043-21grep21:35:270
117937999542,10cyclictest1195517-21/usr/sbin/munin20:40:240
117937999541,5cyclictest1231484-21grep00:10:260
117937999541,4cyclictest1212375-21/usr/sbin/munin22:20:120
1179379995413,35cyclictest0-21swapper/022:30:260
1179383995340,9cyclictest0-21swapper/222:25:002
1179382995326,12cyclictest22-21rcuc/119:25:011
1179379995315,35cyclictest1190694-21apt-get20:15:050
117937999531,3cyclictest1206440-21df_inode21:45:190
117937999521,4cyclictest1216138-21meminfo22:40:250
117937999521,3cyclictest1209749-21/usr/sbin/munin22:05:110
1179379995141,6cyclictest1194996-21cron20:40:000
1179379995141,6cyclictest1194996-21cron20:40:000
1179379995122,26cyclictest0-21swapper/021:00:290
117937999512,10cyclictest1203761-21latency_hist21:30:020
117937999511,8cyclictest1234869-21/usr/sbin/munin00:30:240
117937999511,2cyclictest0-21swapper/019:30:300
117938299501,4cyclictest0-21swapper/100:30:021
117937999504,42cyclictest0-21swapper/022:50:200
117937999503,41cyclictest1230863-21grep00:05:320
117937999503,40cyclictest1213953-21latency_hist22:30:010
117937999501,7cyclictest1208289-21/usr/sbin/munin21:55:200
117937999501,7cyclictest1208289-21/usr/sbin/munin21:55:200
117937999501,13cyclictest1223631-21sh23:25:220
1179382994942,4cyclictest1227454-21munin-plugin-st23:50:001
117937999494,32cyclictest1212341-21latency_hist22:20:020
117937999491,6cyclictest1217187-21/usr/sbin/munin22:45:310
117937999491,4cyclictest1226271-21memory23:40:260
117937999491,4cyclictest1226271-21memory23:40:260
117937999491,3cyclictest0-21swapper/023:10:010
1179383994823,10cyclictest0-21swapper/220:40:222
1179382994840,4cyclictest0-21swapper/120:00:001
1179382994834,8cyclictest0-21swapper/100:05:331
1179379994826,17cyclictest1201764-21unixbench_multi21:15:310
1179379994826,17cyclictest1201764-21unixbench_multi21:15:310
117937999481,3cyclictest1202141-21diskstats21:20:200
117938299472,41cyclictest0-21swapper/121:30:011
117937999472,9cyclictest1219981-21cat23:05:020
117937999472,8cyclictest1188381-21/usr/sbin/munin20:00:150
117937999471,8cyclictest1193527-21apt-get20:30:140
1179382994639,4cyclictest1201857-21munin-plugin-st21:20:011
1179382994639,4cyclictest1201857-21munin-plugin-st21:20:011
1179382994632,8cyclictest0-21swapper/121:55:271
1179382994632,8cyclictest0-21swapper/121:55:271
1179383994536,5cyclictest1186416-21latency_hist19:50:012
1179383994535,6cyclictest311ktimers/220:35:202
1179383994535,6cyclictest311ktimers/220:35:202
1179383994436,5cyclictest1188166-21sendmail20:00:002
1179382994437,4cyclictest1225745-21cron23:40:001
117938299433,9cyclictest0-21swapper/119:50:001
1179382994336,4cyclictest1229139-21sendmail00:00:001
1179383994235,3cyclictest1217319-21munin-plugin-st22:50:012
1179383994231,8cyclictest0-21swapper/221:15:002
1179383994228,8cyclictest0-21swapper/219:10:462
1179382994229,8cyclictest0-21swapper/100:35:301
117937999421,6cyclictest1179491-21latency_hist19:10:000
1179383994110,14cyclictest1230274-21/usr/sbin/munin00:05:232
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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