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2026-06-17 - 08:19

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 Jun 17, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3013079996755,8cyclictest311ktimers/223:15:122
301307799611,22cyclictest0-21swapper/120:00:031
3013074995923,33cyclictest0-21swapper/020:30:290
3013074995851,5cyclictest0-21swapper/019:30:020
3013077995748,5cyclictest3043151-21munin-plugin-st22:05:011
301307499547,43cyclictest3057961-21fschecks_time23:30:210
301307499547,43cyclictest3057961-21fschecks_time23:30:200
3013074995319,30cyclictest0-21swapper/022:55:010
3013077995242,6cyclictest3017545-21munin-plugin-st19:35:001
3013077995040,6cyclictest3038927-21sendmail21:40:001
3013077995040,6cyclictest3038927-21sendmail21:40:001
3013077995037,8cyclictest1283-21cron00:15:001
3013074994941,2cyclictest0-21swapper/000:25:020
3013074994913,34cyclictest131ktimers/023:05:270
3013074994913,34cyclictest131ktimers/023:05:260
3013074994837,8cyclictest3021853-21sendmail20:00:000
3013074994830,15cyclictest20850irq/208-8000000.ethernet22:10:160
3013077994740,4cyclictest3027850-21cron20:34:591
3013077994710,20cyclictest3026377-21/usr/sbin/munin20:25:191
3013077994710,20cyclictest3026377-21/usr/sbin/munin20:25:191
301307499471,43cyclictest3049792-21/usr/sbin/munin22:40:290
3013077994634,9cyclictest3035462-21sendmail21:20:001
3013074994639,4cyclictest3039725-21unixbench_singl21:40:280
3013074994639,4cyclictest19750irq/27-20000000.i2c21:45:290
3013074994638,4cyclictest3054580-21fschecks_time23:10:210
301307499462,41cyclictest200-21pr/ttyS220:30:000
301307499462,41cyclictest200-21pr/ttyS220:30:000
3013079994537,5cyclictest3028709-21sendmail20:40:002
3013079994532,8cyclictest0-21swapper/219:20:262
3013074994535,7cyclictest0-21swapper/022:50:000
3013074994532,8cyclictest0-21swapper/019:20:260
301307499452,4cyclictest3017631-21date19:35:010
301307499452,40cyclictest3018881-21grep19:40:210
301307499452,40cyclictest0-21swapper/021:35:200
301307499452,40cyclictest0-21swapper/021:35:190
301307499451,5cyclictest3061242-21df_inode23:50:170
301307499451,5cyclictest3043150-21munin-run22:05:000
301307499451,42cyclictest0-21swapper/021:10:190
3013079994432,7cyclictest3026947-21grep20:25:302
3013079994432,7cyclictest3026947-21grep20:25:292
3013079994430,10cyclictest0-21swapper/219:50:002
301307799446,9cyclictest0-21swapper/122:30:011
301307799446,9cyclictest0-21swapper/122:30:011
3013074994438,3cyclictest0-21swapper/000:15:120
301307499443,6cyclictest3019791-21irqstats19:45:240
3013074994428,14cyclictest167350irq/118-8000000.ethernet-tx020:00:320
3013074994426,15cyclictest131ktimers/022:15:140
301307499442,40cyclictest0-21swapper/022:35:170
301307499442,39cyclictest3041972-21/usr/sbin/munin21:55:250
301307499441,4cyclictest3036311-21apt21:25:000
301307499441,4cyclictest3020443-21diskstats19:50:170
301307499441,41cyclictest0-21swapper/020:40:120
3013079994336,5cyclictest3013881-21munin-plugin-st19:15:002
3013079994332,5cyclictest3031969-21grep20:55:302
3013079994328,10cyclictest0-21swapper/222:45:292
3013077994335,5cyclictest3020172-21grep19:49:591
3013077994328,9cyclictest0-21swapper/123:40:211
301307799432,33cyclictest0-21swapper/120:10:201
3013077994314,4cyclictest3017542-21apt-get19:35:021
3013074994336,4cyclictest3031161-21grep20:50:290
3013074994335,5cyclictest3065277-21munin-run00:14:590
3013074994335,5cyclictest0-21swapper/022:20:260
3013074994334,4cyclictest20650irq/252-8000000.ethernet20:20:000
301307499433,38cyclictest0-21swapper/021:50:240
301307499432,4cyclictest3034990-21perl21:15:220
301307499431,5cyclictest3032591-21meminfo21:00:220
301307499431,4cyclictest3063482-21users00:00:300
301307499431,40cyclictest0-21swapper/023:00:300
3013077994231,7cyclictest0-21swapper/121:20:291
3013077994228,10cyclictest1283-21cron23:54:591
3013074994234,6cyclictest15-21rcuc/020:55:210
3013074994231,8cyclictest0-21swapper/020:45:290
301307499422,5cyclictest3068091-21df_inode00:30:180
301307499422,5cyclictest3013303-21df_inode19:10:180
301307499421,4cyclictest3067475-21meminfo00:25:260
301307499421,39cyclictest0-21swapper/020:35:200
301307499421,36cyclictest0-21swapper/021:25:030
3013074994130,8cyclictest3023866-21fschecks_count20:10:210
301307499412,4cyclictest3018027-21dropbear19:35:210
301307499412,37cyclictest0-21swapper/021:30:190
301307499411,4cyclictest3057265-21/usr/sbin/munin23:25:270
301307499411,37cyclictest3064187-21grep00:05:320
3013079994031,4cyclictest0-21swapper/200:25:292
3013079994027,8cyclictest0-21swapper/219:50:192
3013079994026,5cyclictest0-21swapper/222:05:322
3013077994031,4cyclictest167450irq/126-8000000.ethernet-tx121:25:281
3013077994029,6cyclictest0-21swapper/122:45:301
3013077994028,8cyclictest0-21swapper/120:55:001
3013077994028,8cyclictest0-21swapper/120:35:291
3013077994026,8cyclictest0-21swapper/121:14:591
301307799401,8cyclictest0-21swapper/122:40:011
301307799401,32cyclictest0-21swapper/119:55:291
3013074994032,5cyclictest0-21swapper/023:20:150
3013074994032,5cyclictest0-21swapper/021:07:320
3013074994032,5cyclictest0-21swapper/021:07:320
301307499401,4cyclictest3060633-21meminfo23:45:250
301307499401,37cyclictest0-21swapper/023:35:180
301307499401,37cyclictest0-21swapper/023:15:150
301307499401,37cyclictest0-21swapper/000:35:150
3013079993930,5cyclictest3036197-21tail21:20:292
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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