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2026-04-16 - 06:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, 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.

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 rackfslot4s.osadl.org (updated Thu Apr 16, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1940721280,2chrt19403-21aten2.4-expect20:15:250
1048121280,2chrt10482-21sh22:31:160
713721230,2chrt7142-21tr22:26:030
734921210,2sleep07351-21cut19:55:430
1353821200,2chrt13539-21runrttasks23:23:490
794121190,2chrt7940-21/usr/sbin/munin23:15:370
1020621180,3chrt10200-21ntpq00:07:190
397321160,3chrt3976-21cut22:21:060
1539521160,2chrt15396-21aten2.4_rfpower00:15:320
2475421150,3chrt24752-21ld22:51:470
2397921150,2chrt23980-21runrttasks23:39:580
2676521140,3chrt26743-21ntpq22:06:280
2471221120,2sleep024713-21runrttasks00:29:220
909421090,2chrt9095-21cat20:50:400
2578821090,1sleep025789-21fschecks_time00:30:530
2265021080,2chrt22651-21ssh21:12:120
2579421070,2chrt25795-21ld23:41:560
2278821070,2chrt22787-21smartctl22:00:560
1990021070,2sleep019901-21seq22:45:070
2557321040,2chrt25574-21sleep19:32:440
3162921000,1sleep031631-21cron00:39:590
163292970,2sleep016331-21wc22:40:060
133412960,2sleep013342-21df20:05:290
97172940,2sleep09720-21sed21:41:030
278412930,2sleep027842-21ld22:56:230
199762930,2sleep019977-21ld00:21:420
12022930,1sleep01203-21chrt23:54:150
107212810,2sleep010722-21latency_hist19:10:030
18922760,2sleep01893-21chrt21:29:500
152662740,2sleep015267-21sh21:00:380
115752730,2sleep011573-21sendmail_mailtr20:01:590
71632710,2sleep07164-21seq23:14:330
288752710,2sleep028876-21tune2fs21:21:290
308242700,2sleep030826-21chrt19:41:000
170142700,2sleep017015-21chrt21:51:520
64072680,2sleep06408-21seq00:01:310
233982670,2sleep023397-21sed19:30:030
121152670,1sleep012118-21aten2.4_rfpower00:10:330
284002660,3sleep028403-21sed23:46:030
150702640,2sleep015071-21seq21:49:310
123122630,2sleep012313-21seq19:11:240
55482580,1sleep05549-21chrt20:45:230
32272570,2sleep03228-21cat23:08:110
58482554,42sleep05872-21ls21:35:370
126332540,1sleep012631-21seq20:55:510
189872523,39sleep018989-21ntpq23:31:420
161092522,41sleep016112-21sshd20:10:130
312912513,7sleep0412-21snmpd20:34:360
303902513,41sleep030376-21ntp_states22:12:030
50482500,4chrt5046-21/usr/sbin/munin19:51:270
30622500,2sleep03064-21cut20:40:420
29012500,1sleep02903-21chrt22:20:050
303962492,6sleep030386-21diskstats23:00:510
268882490,1sleep026890-21/usr/sbin/munin19:35:260
179842490,2sleep017985-21seq22:41:560
10689904818,22cyclictest0-21swapper21:19:310
188212472,5sleep018794-21apt-get21:55:170
10689904718,21cyclictest0-21swapper21:33:330
277042450,3sleep027703-21sshd20:28:130
154182453,35sleep015460-21ntpq19:16:400
10689904516,20cyclictest0-21swapper23:59:050
1068990445,19cyclictest15761-21ntp_states23:26:540
14272430,2sleep01428-21chrt19:45:560
10689904114,21cyclictest0-21swapper20:39:430
1068990403,10cyclictest17793-21hddtemp_smartct19:20:380
1068990396,12cyclictest23574-21ntp_states20:21:100
1068990393,17cyclictest18321-21perl21:05:360
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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