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2026-03-31 - 02:55

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 Mon Mar 30, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
76301299110103,4cyclictest131ktimers/009:15:190
763013997510,12cyclictest819341-21apt-get12:40:021
763012996659,2cyclictest0-21swapper/010:50:010
763013996543,18cyclictest770850-21apt07:54:591
763013996524,35cyclictest0-21swapper/110:00:261
763013996516,37cyclictest0-21swapper/110:30:271
76301399639,30cyclictest801720-21/usr/sbin/munin10:55:201
76301899625,12cyclictest30-21rcuc/210:50:022
763012996256,4cyclictest131ktimers/011:55:010
763012996256,4cyclictest131ktimers/011:55:010
76301299621,59cyclictest0-21swapper/009:05:120
76301399611,15cyclictest815322-21apt-get12:15:151
763013996028,28cyclictest1660-21snmpd09:35:221
763018995911,31cyclictest32-21ksoftirqd/212:30:202
763013995935,20cyclictest0-21swapper/108:04:591
763013995824,26cyclictest0-21swapper/111:44:591
763013995823,28cyclictest0-21swapper/108:45:291
763013995816,34cyclictest0-21swapper/111:50:021
763013995743,10cyclictest815122-21munin-plugin-st12:15:001
76301399573,11cyclictest812098-21tune2fs11:55:221
76301399573,11cyclictest812098-21tune2fs11:55:221
763013995728,22cyclictest792054-21sendmail10:00:001
763013995721,29cyclictest0-21swapper/107:30:021
763013995717,4cyclictest0-21swapper/111:00:291
763013995715,36cyclictest0-21swapper/107:15:021
763013995715,36cyclictest0-21swapper/107:15:021
763013995715,31cyclictest0-21swapper/108:20:001
76301399561,13cyclictest798810-21sed10:35:291
76301399556,13cyclictest0-21swapper/109:40:281
76301399556,13cyclictest0-21swapper/109:40:281
76301399552,14cyclictest784804-21tune2fs09:15:191
763013995514,6cyclictest0-21swapper/108:05:241
763013995514,4cyclictest0-21swapper/107:20:201
763013995512,7cyclictest0-21swapper/109:00:271
763013995417,6cyclictest794781-21/usr/sbin/munin10:15:131
76301399541,13cyclictest779289-21grep08:40:271
763018995332,13cyclictest311ktimers/211:30:112
76301399532,31cyclictest776765-21apt-get08:30:011
763013995314,6cyclictest0-21swapper/110:25:291
76301399531,46cyclictest0-21swapper/108:25:191
763012995348,2cyclictest0-21swapper/009:30:010
76301299531,40cyclictest764940-21apt07:20:000
76301299531,40cyclictest764940-21apt07:20:000
76301899525,23cyclictest30-21rcuc/208:45:022
763018995244,4cyclictest790365-21munin-plugin-st09:49:592
76301399525,13cyclictest0-21swapper/110:50:271
763013995219,28cyclictest0-21swapper/108:20:271
76301399521,45cyclictest0-21swapper/111:35:111
763012995238,10cyclictest0-21swapper/008:55:000
76301299521,25cyclictest800590-21apt-get10:50:020
76301399515,11cyclictest0-21swapper/107:45:211
763013995112,5cyclictest0-21swapper/110:05:191
76301399502,12cyclictest800525-21head10:45:271
76301399502,12cyclictest773954-21grep08:10:281
76301399502,12cyclictest773954-21grep08:10:281
76301399501,22cyclictest0-21swapper/111:20:271
763013995011,6cyclictest0-21swapper/110:45:001
763013995011,5cyclictest0-21swapper/107:15:011
76301299501,47cyclictest0-21swapper/012:05:180
76301299501,17cyclictest0-21swapper/012:35:000
763018994940,5cyclictest763814-21munin-plugin-st07:15:012
76301399497,10cyclictest0-21swapper/111:15:281
763013994940,5cyclictest783605-21apt09:10:011
763013994922,23cyclictest763006-21cyclictest07:40:011
763013994922,20cyclictest0-21swapper/111:25:281
763013994914,4cyclictest0-21swapper/111:50:251
763018994832,11cyclictest311ktimers/209:20:162
763012994841,4cyclictest20650irq/252-8000000.ethernet11:10:190
76301899475,16cyclictest32-21ksoftirqd/209:30:022
763018994738,4cyclictest780235-21munin-plugin-st08:50:012
76301399476,8cyclictest781816-21sed08:55:291
76301399476,7cyclictest791155-21grep09:50:281
76301399472,12cyclictest785674-21sh09:20:201
76301399472,12cyclictest769060-21unixbench_multi07:40:281
763013994717,7cyclictest231ktimers/107:55:261
763012994736,8cyclictest788675-21sendmail09:39:590
763012994639,4cyclictest0-21swapper/008:30:020
763012994636,4cyclictest782409-21uname09:00:230
76301299461,43cyclictest0-21swapper/009:30:100
763018994527,13cyclictest311ktimers/211:25:092
76301399452,20cyclictest1660-21snmpd09:30:221
76301399452,13cyclictest767373-21grep07:30:291
76301399452,13cyclictest767373-21grep07:30:291
763013994516,7cyclictest0-21swapper/108:53:021
763013994515,3cyclictest0-21swapper/109:25:201
763018994435,5cyclictest0-21swapper/209:40:002
763018994330,4cyclictest0-21swapper/210:00:182
763018994328,10cyclictest311ktimers/207:30:122
763018994328,10cyclictest311ktimers/207:30:122
763013994331,7cyclictest813342-21grep12:00:291
763013994318,20cyclictest0-21swapper/110:25:011
763013994315,7cyclictest0-21swapper/109:10:281
76301399431,35cyclictest0-21swapper/111:05:221
76301399431,22cyclictest0-21swapper/112:30:271
763012994336,4cyclictest20650irq/252-8000000.ethernet07:40:270
76301299433,4cyclictest775290-21/usr/sbin/munin08:20:210
76301299432,5cyclictest780044-21sendmail_mailqu08:45:270
763018994236,3cyclictest819362-21apt-get12:40:012
763012994234,5cyclictest0-21swapper/012:10:270
76301299421,3cyclictest0-21swapper/008:10:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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