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2026-04-07 - 18:34

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 Tue Apr 07, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36466249910611,5cyclictest3673233-21apt-get09:45:013
364662499827,11cyclictest3647441-21munin-node07:15:013
364662199731,24cyclictest24-21ksoftirqd/108:55:181
3646621997110,22cyclictest3681959-21/usr/sbin/munin10:35:201
3646618996761,4cyclictest131ktimers/007:35:010
3646618996761,4cyclictest131ktimers/007:35:010
364661899671,4cyclictest0-21swapper/007:50:010
3646621995724,13cyclictest0-21swapper/108:25:011
3646622995616,11cyclictest3663297-21/usr/sbin/munin08:45:202
364662299551,27cyclictest30-21rcuc/210:20:022
364661899541,42cyclictest3648889-21sh07:20:190
3646618995342,7cyclictest0-21swapper/009:50:010
3646618995342,7cyclictest0-21swapper/009:50:010
364662299522,14cyclictest3657837-21apt-get08:15:012
3646622995137,8cyclictest0-21swapper/211:30:282
3646622995033,8cyclictest0-21swapper/209:55:272
364662199502,3cyclictest0-21swapper/111:20:011
364662199502,13cyclictest24-21ksoftirqd/107:20:011
3646621994929,8cyclictest0-21swapper/107:45:001
3646618994940,4cyclictest167350irq/118-8000000.ethernet-tx011:40:160
364661899491,35cyclictest3634861-1kworker/0:1H+kblockd10:10:010
3646621994836,7cyclictest3681705-21unixbench_singl10:30:271
3646621994811,15cyclictest22-21rcuc/111:35:011
3646621994811,15cyclictest22-21rcuc/111:35:011
3646622994735,7cyclictest0-21swapper/212:25:002
3646618994740,4cyclictest167350irq/118-8000000.ethernet-tx009:40:180
3646618994737,6cyclictest3682542-21grep10:35:290
364661899472,4cyclictest0-21swapper/007:25:210
3646622994611,28cyclictest30-21rcuc/208:05:272
364662199467,18cyclictest22-21rcuc/110:30:011
3646621994631,8cyclictest0-21swapper/108:35:281
3646618994639,4cyclictest167350irq/118-8000000.ethernet-tx009:50:280
3646618994634,8cyclictest0-21swapper/012:10:010
364661899462,15cyclictest0-21swapper/012:05:010
3646621994535,6cyclictest0-21swapper/107:10:271
3646618994530,8cyclictest3647605-21latency_hist07:15:010
3646618994528,15cyclictest131ktimers/009:30:000
3646622994432,9cyclictest0-21swapper/211:00:002
3646622994431,8cyclictest0-21swapper/210:35:292
364662199445,11cyclictest24-21ksoftirqd/110:25:011
3646621994436,5cyclictest3651087-21munin-plugin-st07:35:001
3646621994431,7cyclictest3673182-21grep09:40:281
364661899442,4cyclictest3669510-21cut09:20:240
364661899441,37cyclictest3695454-21latency_hist11:55:010
3646622994331,8cyclictest0-21swapper/208:25:012
3646622994330,7cyclictest0-21swapper/211:20:272
3646622994330,7cyclictest0-21swapper/211:20:272
3646622994328,10cyclictest0-21swapper/209:35:292
3646622994312,8cyclictest311ktimers/210:15:012
3646621994335,5cyclictest3651929-21munin-plugin-st07:40:001
3646621994335,5cyclictest3651929-21munin-plugin-st07:40:001
3646621994328,10cyclictest0-21swapper/109:35:221
3646618994336,4cyclictest167350irq/118-8000000.ethernet-tx008:00:240
364661899431,6cyclictest3690416-21apt11:25:110
3646622994234,4cyclictest3668995-21cron09:20:002
3646622994232,6cyclictest3666367-21grep09:00:272
3646622994230,8cyclictest0-21swapper/212:25:292
3646622994230,8cyclictest0-21swapper/212:25:292
3646622994228,9cyclictest0-21swapper/212:05:282
3646622994228,10cyclictest0-21swapper/211:00:292
364662299421,17cyclictest14-21rcu_preempt10:35:022
3646621994232,6cyclictest3696163-21grep11:55:291
3646621994227,9cyclictest0-21swapper/111:25:201
3646621994227,10cyclictest3697896-21apt-get12:10:021
3646621994226,10cyclictest0-21swapper/111:40:211
364661899429,30cyclictest0-21swapper/012:30:260
364661899422,4cyclictest3659053-21df_inode08:20:190
3646618994223,17cyclictest3663357-21df08:45:180
364661899421,5cyclictest3699958-21diskstats12:20:180
364661899421,5cyclictest3688173-21meminfo11:10:230
3646622994130,6cyclictest0-21swapper/207:40:292
3646622994125,8cyclictest0-21swapper/210:00:282
3646622994124,10cyclictest0-21swapper/210:20:282
3646621994130,7cyclictest231ktimers/112:25:121
3646621994130,7cyclictest231ktimers/112:25:121
364661899412,4cyclictest3660218-21meminfo08:25:240
364661899412,4cyclictest3660218-21meminfo08:25:240
364661899411,4cyclictest3700984-21irqstats12:25:240
364661899411,4cyclictest3700984-21irqstats12:25:240
364661899411,38cyclictest0-21swapper/011:15:120
364661899411,38cyclictest0-21swapper/011:05:240
364661899411,38cyclictest0-21swapper/010:45:250
364661899411,38cyclictest0-21swapper/008:05:270
3646622994030,6cyclictest0-21swapper/209:45:292
3646622994030,6cyclictest0-21swapper/209:45:292
3646622994028,8cyclictest0-21swapper/210:40:282
3646622994028,8cyclictest0-21swapper/210:40:282
3646622994028,7cyclictest0-21swapper/207:25:292
3646622994027,8cyclictest0-21swapper/212:15:292
3646622994027,8cyclictest0-21swapper/211:25:282
3646622994027,8cyclictest0-21swapper/207:50:272
3646622994023,12cyclictest311ktimers/208:00:132
3646621994029,6cyclictest231ktimers/107:30:001
3646621994029,6cyclictest0-21swapper/109:00:271
3646621994025,9cyclictest0-21swapper/107:55:181
3646621994010,9cyclictest24-21ksoftirqd/110:15:011
3646618994034,4cyclictest0-21swapper/010:05:010
3646618994033,4cyclictest167350irq/118-8000000.ethernet-tx010:30:410
3646618994029,7cyclictest3654364-21grep07:50:270
3646618994027,8cyclictest0-21swapper/007:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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