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2026-09-05 - 10:55

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 Sep 05, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
225445099661,3cyclictest0-21swapper/022:05:120
225445099651,29cyclictest15-21rcuc/022:45:020
2254450996452,6cyclictest2269979-21kworker/u8:3+events_power_efficient20:45:110
225445099621,59cyclictest0-21swapper/020:10:190
225445699614,29cyclictest0-21swapper/219:15:012
2254450996049,6cyclictest0-21swapper/020:05:260
225445099601,4cyclictest0-21swapper/000:00:180
225445699571,11cyclictest0-21swapper/221:10:192
225445299569,9cyclictest2299726-21apt-get23:35:021
2254452995540,11cyclictest1283-21cron22:55:001
2254450995429,22cyclictest19750irq/27-20000000.i2c21:20:230
225445099532,4cyclictest2281033-21grep21:40:270
2254452995242,6cyclictest2275071-21munin-plugin-st21:10:001
225445099511,9cyclictest0-21swapper/019:25:010
225445099509,28cyclictest131ktimers/019:45:180
2254450995037,9cyclictest2273379-21sendmail21:00:000
2254450995037,9cyclictest2273379-21sendmail21:00:000
2254450995035,11cyclictest0-21swapper/021:55:280
2254450994938,7cyclictest131ktimers/021:50:100
2254452994840,5cyclictest2309204-21munin-plugin-st00:30:001
2254450994734,10cyclictest1283-21cron21:35:000
2254450994727,15cyclictest131ktimers/023:50:120
2254456994639,4cyclictest2302446-21munin-plugin-st23:50:002
2254450994640,3cyclictest167350irq/118-8000000.ethernet-tx019:30:180
2254450994639,4cyclictest167350irq/118-8000000.ethernet-tx020:15:150
2254450994637,7cyclictest2297111-21munin-plugin-st23:20:000
2254456994536,4cyclictest311ktimers/221:35:012
2254452994517,16cyclictest2301804-21/usr/sbin/munin23:45:181
225445099458,33cyclictest0-21swapper/020:35:000
2254450994538,5cyclictest0-21swapper/023:10:150
2254450994529,11cyclictest0-21swapper/022:55:010
2254456994435,5cyclictest0-21swapper/222:20:302
225445099441,7cyclictest2275118-21latency_hist21:10:010
2254456994330,9cyclictest0-21swapper/223:40:012
2254456994328,10cyclictest0-21swapper/220:15:162
2254450994337,4cyclictest2260624-21munin-plugin-st19:45:010
2254450994332,9cyclictest0-21swapper/023:40:010
225445099432,4cyclictest0-21swapper/020:25:010
225445099431,5cyclictest2263135-21cron20:00:010
225445099431,40cyclictest2262482-21latency_hist19:55:010
2254456994232,6cyclictest0-21swapper/223:25:002
2254456994232,5cyclictest2305765-21unixbench_singl00:05:282
2254456994231,6cyclictest2259698-21grep19:35:282
2254456994229,8cyclictest0-21swapper/222:30:312
2254456994226,10cyclictest0-21swapper/219:25:282
2254456994226,10cyclictest0-21swapper/219:25:282
2254452994232,6cyclictest0-21swapper/119:35:281
2254452994229,9cyclictest0-21swapper/100:10:001
2254452994226,10cyclictest231ktimers/119:45:131
225445099429,3cyclictest2276783-21apt-key21:20:000
2254450994234,6cyclictest131ktimers/023:30:260
2254450994234,4cyclictest167350irq/118-8000000.ethernet-tx022:10:170
2254456994132,6cyclictest2295362-21grep23:05:272
2254456994132,6cyclictest2295362-21grep23:05:272
2254456994129,8cyclictest2298892-21munin-plugin-st23:30:012
2254456994129,8cyclictest2298892-21munin-plugin-st23:30:002
2254456994129,8cyclictest0-21swapper/222:10:002
2254452994132,7cyclictest2291090-21grep22:40:271
2254452994132,5cyclictest0-21swapper/122:40:001
2254452994132,4cyclictest0-21swapper/120:45:281
225445299412,8cyclictest2276946-21grep21:20:011
2254452994128,8cyclictest0-21swapper/120:25:311
2254452994128,5cyclictest0-21swapper/100:20:231
2254450994134,4cyclictest2269998-21munin-plugin-st20:40:000
2254450994134,4cyclictest0-21swapper/023:55:150
225445099412,6cyclictest2297899-21grep23:20:280
225445099412,5cyclictest2277966-21df_inode21:25:180
2254450994122,16cyclictest0-21swapper/022:41:320
225445099411,38cyclictest0-21swapper/023:40:050
225445699409,25cyclictest0-21swapper/219:30:182
2254456994033,4cyclictest0-21swapper/223:45:002
2254456994032,5cyclictest0-21swapper/200:35:002
2254456994032,4cyclictest0-21swapper/220:25:302
225445299407,4cyclictest2255399-21diskstats19:15:011
2254452994032,4cyclictest0-21swapper/119:20:291
2254452994031,5cyclictest0-21swapper/121:00:271
2254452994029,6cyclictest0-21swapper/100:35:271
2254452994022,13cyclictest231ktimers/119:15:141
225445099404,33cyclictest0-21swapper/000:25:280
2254450994035,2cyclictest0-21swapper/022:15:270
2254450994033,4cyclictest0-21swapper/023:00:160
2254450994025,10cyclictest0-21swapper/020:00:190
225445099401,37cyclictest0-21swapper/023:05:140
225445099401,37cyclictest0-21swapper/023:05:140
225445099401,36cyclictest2305604-21ptp4l-jitter00:05:260
2254456993933,3cyclictest2307408-21unixbench_multi00:15:292
2254456993931,4cyclictest167550irq/134-8000000.ethernet-tx220:30:222
2254456993929,5cyclictest2291989-21grep22:45:282
2254456993926,7cyclictest2297031-21grep23:15:272
225445299396,8cyclictest22-21rcuc/122:20:001
2254450993933,3cyclictest167350irq/118-8000000.ethernet-tx023:48:330
225445099391,36cyclictest0-21swapper/022:55:200
225445699383,25cyclictest30-21rcuc/221:00:142
2254456993830,5cyclictest2260623-21munin-plugin-st19:45:012
2254456993830,4cyclictest167550irq/134-8000000.ethernet-tx220:05:232
2254456993827,6cyclictest2304077-21grep23:55:282
2254456993824,7cyclictest0-21swapper/221:45:272
225445699382,28cyclictest2269647-21meminfo20:35:232
225445299384,28cyclictest22-21rcuc/123:25:021
2254452993828,5cyclictest0-21swapper/120:20:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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