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2026-04-30 - 00:47

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 Wed Apr 29, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2141403999185,4cyclictest231ktimers/108:50:011
2141400996615,47cyclictest131ktimers/009:55:120
2141400996510,21cyclictest2163002-21rm09:15:010
2141400996252,7cyclictest131ktimers/010:05:010
214140099602,16cyclictest0-21swapper/010:20:000
2141404995915,22cyclictest2161360-21/usr/sbin/munin09:05:182
2141404995810,17cyclictest30-21rcuc/212:30:002
2141404995622,15cyclictest32-21ksoftirqd/212:00:172
2141400995643,4cyclictest0-21swapper/007:50:010
2141400995643,4cyclictest0-21swapper/007:50:010
2141403995547,5cyclictest1258-21in:imuxsock11:30:001
2141403995542,9cyclictest2153559-21sendmail08:20:001
2141400995547,6cyclictest0-21swapper/009:30:010
2141404995419,12cyclictest30-21rcuc/211:00:012
2141400995133,15cyclictest167350irq/118-8000000.ethernet-tx009:15:280
2141403994929,12cyclictest231ktimers/112:35:121
2141400994936,9cyclictest2195365-21latency_hist12:25:010
2141403994833,9cyclictest0-21swapper/110:10:291
214140399481,5cyclictest0-21swapper/108:10:001
2141400994838,5cyclictest0-21swapper/009:05:100
2141400994838,4cyclictest2178413-21latency_hist10:45:000
2141400994834,10cyclictest2147462-21grep07:40:280
2141403994717,7cyclictest0-21swapper/110:30:011
2141403994711,9cyclictest2171462-21apt-get10:05:011
2141404994634,8cyclictest2159426-21grep08:50:282
2141403994642,2cyclictest0-21swapper/109:50:011
2141400994637,5cyclictest167350irq/118-8000000.ethernet-tx012:25:200
2141400994624,20cyclictest20650irq/252-8000000.ethernet07:25:190
2141404994534,6cyclictest2190069-21grep11:50:282
2141404994532,6cyclictest0-21swapper/212:05:272
2141403994534,7cyclictest0-21swapper/108:20:271
2141403994533,7cyclictest0-21swapper/111:40:281
2141403994533,7cyclictest0-21swapper/111:40:281
2141403994531,8cyclictest0-21swapper/112:05:281
2141400994538,5cyclictest2155248-21munin-plugin-st08:30:000
2141400994536,6cyclictest20650irq/252-8000000.ethernet08:15:260
2141400994533,9cyclictest2187588-21sendmail11:40:000
2141404994433,7cyclictest0-21swapper/210:25:002
2141404994432,8cyclictest0-21swapper/207:45:282
2141404994432,8cyclictest0-21swapper/207:45:272
2141404994431,7cyclictest311ktimers/208:05:002
2141404994427,7cyclictest0-21swapper/209:40:282
2141404994426,10cyclictest0-21swapper/207:35:182
2141403994435,6cyclictest2178307-21munin-plugin-st10:44:591
2141403994433,7cyclictest2157682-21grep08:40:281
2141403994433,7cyclictest2157682-21grep08:40:281
2141403994432,9cyclictest0-21swapper/111:20:001
2141403994431,8cyclictest0-21swapper/112:25:311
2141404994333,6cyclictest2193493-21grep12:10:292
2141404994333,5cyclictest0-21swapper/212:15:292
2141404994330,8cyclictest0-21swapper/211:55:292
2141404994328,7cyclictest0-21swapper/209:00:262
2141403994337,3cyclictest14-21rcu_preempt09:35:191
2141403994335,4cyclictest0-21swapper/111:05:021
2141403994335,4cyclictest0-21swapper/111:05:021
2141403994329,11cyclictest2156932-21sendmail08:40:011
2141400994334,6cyclictest2156810-21grep08:35:270
214140099431,40cyclictest0-21swapper/007:15:020
2141404994232,7cyclictest2181648-21grep11:00:272
2141404994232,7cyclictest2181648-21grep11:00:272
2141404994231,6cyclictest2172392-21munin-plugin-st10:10:012
2141404994230,8cyclictest2163729-21grep09:15:292
214140499422,29cyclictest2183355-21kworker/u8:3+rpciod11:34:222
214140499422,28cyclictest2151863-21kworker/u8:4+rpciod08:12:212
2141403994232,5cyclictest231ktimers/109:45:111
2141400994235,4cyclictest0-21swapper/007:30:250
214140099422,2cyclictest0-21swapper/007:40:010
2141404994134,5cyclictest0-21swapper/209:00:012
2141404994133,4cyclictest2175773-21munin-plugin-st10:29:592
2141404994129,5cyclictest2179077-21grep10:45:292
2141404994126,7cyclictest0-21swapper/209:30:202
2141403994126,10cyclictest0-21swapper/110:35:271
214140099411,4cyclictest2150371-21df_inode08:00:180
214140099411,3cyclictest2175126-21cut10:25:010
214140499409,24cyclictest2-21kthreadd09:46:172
2141404994030,6cyclictest2184956-21grep11:20:272
2141404994030,5cyclictest0-21swapper/212:25:302
2141404994024,10cyclictest0-21swapper/209:10:222
2141404994023,4cyclictest2150932-21kworker/u8:0-events_power_efficient08:40:012
2141404994015,20cyclictest2-21kthreadd12:37:222
2141404994015,18cyclictest2-21kthreadd09:22:192
2141404994013,11cyclictest0-21swapper/211:25:112
2141403994031,4cyclictest0-21swapper/109:00:001
2141403994028,7cyclictest0-21swapper/107:50:281
2141403994024,9cyclictest0-21swapper/110:05:291
2141400994033,5cyclictest2197898-21sendmail12:40:010
214140099402,8cyclictest2180776-21sed10:55:280
2141400994028,8cyclictest0-21swapper/010:50:300
2141400994028,8cyclictest0-21swapper/009:35:280
214140499395,21cyclictest2158569-21head08:45:282
2141404993929,6cyclictest0-21swapper/210:10:192
214140499392,28cyclictest2175762-21kworker/u8:0+rpciod10:54:262
2141403993931,4cyclictest0-21swapper/111:45:281
2141403993929,7cyclictest0-21swapper/110:15:291
2141403993928,5cyclictest0-21swapper/110:50:301
2141403993926,8cyclictest0-21swapper/107:55:291
2141403993926,8cyclictest0-21swapper/107:45:281
2141403993926,8cyclictest0-21swapper/107:45:281
2141403993925,8cyclictest0-21swapper/112:00:271
214140099394,21cyclictest15-21rcuc/010:25:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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