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2026-08-10 - 20:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #4

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack9slot4s (updated Mon Aug 10, 2026 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
42659912621212,37cyclictest25908-21expr09:45:131
42659911931171,18cyclictest4910-21smartctl07:25:191
42649911551119,24cyclictest0-21swapper/007:25:220
40002562518,29sleep10-21swapper/107:22:501
41372464364,84sleep00-21swapper/007:24:130
426499236218,15cyclictest0-21swapper/009:45:130
2610821050,4sleep10-21swapper/108:20:131
203972940,5sleep020395-21timerandwakeup12:20:300
127812640,2sleep012782-21awk09:10:160
4265994319,8cyclictest22-21ksoftirqd/108:00:211
4265993917,7cyclictest22-21ksoftirqd/110:49:421
426599389,7cyclictest3286-21runrttasks07:42:321
426499385,14cyclictest11565-21gdbus12:38:340
426499385,12cyclictest0-21swapper/011:00:000
4265993616,6cyclictest22-21ksoftirqd/110:00:291
4265993614,6cyclictest22-21ksoftirqd/110:15:171
4265993611,7cyclictest8678-21idleruntime-cro07:35:001
426499363,16cyclictest0-21swapper/011:17:330
426599351,22cyclictest15918-21sshd09:18:351
426499357,12cyclictest3286-21runrttasks09:04:150
426499356,13cyclictest40250irq/92-i91512:05:250
426499353,15cyclictest0-21swapper/010:10:110
426499351,14cyclictest7608-21/usr/sbin/munin07:30:200
4265993413,5cyclictest22-21ksoftirqd/110:23:111
4265993410,8cyclictest10121-21unixbench_singl07:35:301
426499348,6cyclictest23099-21sshd11:03:360
426499343,11cyclictest0-21swapper/012:11:300
426499343,11cyclictest0-21swapper/010:35:380
426499342,14cyclictest3989-21taskset11:39:250
426499342,14cyclictest28549-21/usr/sbin/munin08:25:210
426499341,6cyclictest19558-21runrttasks09:27:100
4264993412,6cyclictest4828-21iostat11:40:190
426499341,15cyclictest21319-21grep08:05:280
426499341,15cyclictest17065-21/usr/sbin/munin07:55:140
426499341,13cyclictest9877-21/usr/sbin/munin11:55:120
317512341,29sleep131755-21ntp_states11:25:251
110612341,4sleep111065-21ntp_states10:30:261
426499339,6cyclictest28548-21wc09:50:290
426499339,5cyclictest23343-21runrttasks09:37:350
426499337,7cyclictest2498-21chrt08:41:490
426499332,5cyclictest11565-21gdbus10:27:010
426499332,14cyclictest32387-21taskset11:27:250
426499331,6cyclictest10832-21aten_r4power_po07:40:120
426499331,5cyclictest31824-21cpuspeed_turbos08:35:130
426499331,13cyclictest7937-21taskset10:22:230
426499331,13cyclictest1357-21python11:30:290
295012331,10sleep10-21swapper/108:29:121
91432321,27sleep19181-21ntp_states10:25:241
426599328,7cyclictest13127-21swap10:35:281
426599328,5cyclictest81rcu_preempt09:10:011
426599322,11cyclictest0-21swapper/110:58:241
4265993213,6cyclictest22-21ksoftirqd/108:45:251
4265993212,6cyclictest22-21ksoftirqd/108:53:171
4265993210,5cyclictest40250irq/92-i91511:55:121
426499328,6cyclictest26680-21taskset11:11:500
426499328,5cyclictest30250-21chrt12:48:150
426499323,11cyclictest0-21swapper/011:45:430
426499323,11cyclictest0-21swapper/010:53:330
426499323,11cyclictest0-21swapper/010:53:330
426499323,11cyclictest0-21swapper/010:01:450
426499323,11cyclictest0-21swapper/009:42:570
426499323,11cyclictest0-21swapper/007:48:580
426499321,6cyclictest28375-21runrttasks12:43:350
426499321,5cyclictest24943-21taskset11:08:150
426499321,13cyclictest23295-21threads08:10:280
426499321,13cyclictest10217-21runrttasks07:36:150
426499321,12cyclictest21666-21time12:25:190
426499321,12cyclictest11781-21taskset10:33:190
149812321,5sleep10-21swapper/112:06:121
426599318,8cyclictest22-21ksoftirqd/112:52:181
426599318,7cyclictest4262-21cyclictest07:53:511
426599317,6cyclictest6762-21cat11:45:201
426499313,11cyclictest0-21swapper/010:43:310
426499312,5cyclictest11564-21packagekitd08:15:310
426499311,6cyclictest20175-21taskset08:04:550
426499311,5cyclictest24180-21grep12:30:300
426499311,18cyclictest0-21swapper/008:33:040
426499311,18cyclictest0-21swapper/008:20:420
426499311,16cyclictest0-21swapper/011:22:350
426499311,16cyclictest0-21swapper/010:08:350
426499311,13cyclictest4862-21df10:15:130
426499311,12cyclictest15744-21chrt09:16:470
37852311,5sleep10-21swapper/111:37:191
256692311,5sleep10-21swapper/108:18:341
426599309,16cyclictest0-21swapper/112:00:281
426599307,8cyclictest22-21ksoftirqd/112:23:011
426599307,7cyclictest22226-21missed_timers11:00:221
426599306,8cyclictest22-21ksoftirqd/111:52:501
426599306,13cyclictest22-21ksoftirqd/109:31:141
426599302,9cyclictest18349-21iostat10:50:201
426599302,9cyclictest18349-21iostat10:50:201
426599302,8cyclictest1347-21df_inode08:40:141
426599301,14cyclictest30348-21irqstats08:30:221
4265993010,6cyclictest22-21ksoftirqd/112:39:361
426499301,6cyclictest9358-21chrt11:51:260
426499301,16cyclictest0-21swapper/008:47:350
426499301,13cyclictest6532-21seq08:53:510
426499301,13cyclictest0-21swapper/009:09:580
426499301,12cyclictest0-21swapper/010:47:170
254352301,5sleep10-21swapper/109:44:381
426599297,6cyclictest17563-21mailstats07:55:261
426599293,8cyclictest7641-21ntp_states08:55:271
426599292,13cyclictest9204-21hddtemp_smartct09:00:181
426599291,10cyclictest18403-21df09:25:131
426499291,16cyclictest0-21swapper/012:04:200
306902291,4sleep10-21swapper/109:55:461
284652291,5sleep10-21swapper/112:44:321
268252291,5sleep10-21swapper/111:13:221
19632291,5sleep10-21swapper/111:34:001
83042281,5sleep00-21swapper/008:57:460
55752281,5sleep10-21swapper/111:41:061
426599289,4cyclictest40250irq/92-i91510:11:591
426599289,15cyclictest23584-21sort11:05:111
426599285,5cyclictest40250irq/92-i91509:35:141
426599284,9cyclictest994-21diskstats10:05:151
426599284,9cyclictest20645-21diskstats08:05:171
426599282,9cyclictest15806-21diskstats12:10:151
426599281,8cyclictest17970-21iostat12:15:161
426599281,8cyclictest17970-21iostat12:15:161
426599281,14cyclictest28007-21smartctl09:50:181
426599281,13cyclictest13849-21sshd09:11:351
4265992810,14cyclictest0-21swapper/109:20:101
426499282,7cyclictest11564-21packagekitd12:17:360
426499282,7cyclictest11564-21packagekitd12:17:350
301472281,23sleep030201-21grep09:55:250
163382281,5sleep00-21swapper/007:54:140
126282281,7sleep10-21swapper/107:45:041
426599272,6cyclictest3286-21runrttasks08:36:391
426599272,11cyclictest0-21swapper/111:15:261
426599271,9cyclictest3286-21runrttasks11:22:461
426599271,8cyclictest14500-21hddtemp_smartct10:40:171
4265992714,7cyclictest22223-21/usr/sbin/munin08:10:321
4264992716,7cyclictest17432-21grep09:20:290
319782271,5sleep00-21swapper/012:51:430
303592271,5sleep10-21swapper/112:49:251
246912271,5sleep10-21swapper/112:34:291
224492271,5sleep10-21swapper/112:25:391
215762271,5sleep00-21swapper/009:33:410
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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