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2026-08-23 - 01:36

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 highest latencies:
System rackfslot4s.osadl.org (updated Sat Aug 22, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2083621190,2chrt20837-21runrttasks11:32:210
755521170,2chrt7556-21seq10:24:070
2479221150,3chrt24795-21latency_hist10:50:060
1814221150,3chrt18141-21seq11:28:330
2639921140,2chrt26400-21modprobe12:30:050
1626321140,4chrt16253-21ntp_states08:06:200
615521130,2chrt6154-21/usr/sbin/munin07:50:390
414621130,2chrt4147-21find11:07:140
893521120,3chrt8936-21seq11:15:060
380221110,2sleep03803-21missed_timers07:46:400
870721100,2chrt8708-21sleep11:14:510
3145721100,2chrt31456-21sed11:00:050
2449821100,2sleep024500-21cut08:20:240
1966021100,1sleep019663-21latency_hist12:20:090
1636121080,1sleep016363-21cpu07:15:260
1566721080,2chrt15670-21sendmail_mailqu09:47:200
3051721070,2chrt30518-21chrt11:47:020
1736521070,2chrt17366-21runrttasks10:38:260
304721050,2sleep03048-21seq10:16:580
3120621040,2chrt31207-21modprobe12:36:420
1284421030,1sleep012845-21fschecks_count11:20:500
370221020,2chrt3703-21sleep08:39:080
886221000,2sleep08863-21cat10:26:020
2563421000,2sleep025635-21chrt12:28:310
120902990,2sleep012091-21seq08:51:310
200132950,2sleep020015-21chrt12:20:310
79092940,2sleep07910-21seq12:01:490
317112900,2sleep031712-21chrt07:40:210
246892890,2sleep024691-21grep09:12:230
252932830,2sleep025294-21seq11:39:500
131722820,2sleep013173-21seq09:43:520
197942810,2sleep019795-21chrt09:05:160
320882770,2sleep032089-21ld10:11:460
183742760,1sleep018377-21cat09:51:440
249492750,2sleep024951-21cut10:01:060
323382740,2sleep032339-21chrt11:50:310
56682730,2sleep05669-21chrt11:58:480
265772730,2sleep026578-21awk10:52:120
23082730,2sleep02310-21find09:27:210
326952720,1sleep032696-21sh09:24:560
81412650,2sleep08143-21cut09:36:070
283582640,2sleep028359-21rm09:17:360
238602640,1sleep023861-21latency_hist10:00:060
273472600,2sleep027348-21chrt10:05:180
12857905019,23cyclictest0-21swapper10:43:230
12857905015,24cyclictest0-21swapper08:40:400
1081025012,23sleep010807-21ntpq07:05:390
12857904816,22cyclictest0-21swapper11:43:030
152802470,2sleep015279-21seq12:12:570
12857904716,23cyclictest0-21swapper09:33:360
12857904613,13cyclictest903-21python311:02:160
1285790455,19cyclictest13543-21ntp_states10:32:490
1285790445,19cyclictest14516-21memory08:55:500
12857904421,14cyclictest0-21swapper08:30:330
140892430,2sleep014090-21chrt07:10:570
12857904316,18cyclictest11312-21sleep12:07:010
1285790425,9cyclictest17634-21memory09:00:480
1285790424,18cyclictest19180-21/usr/sbin/munin08:11:020
12857904215,15cyclictest8712-21apt-get07:55:170
118432420,2chrt11842-21seq08:00:130
301512410,1sleep030152-21seq08:29:390
1285790419,23cyclictest0-21swapper07:26:260
1285790414,18cyclictest20764-21switchtime07:21:290
12857904114,17cyclictest28667-21telnet07:35:250
1285790404,28cyclictest22225-21ntpq08:15:570
12857904014,17cyclictest420-21lldpd08:45:300
12857904012,11cyclictest25521-21aten2.4-expect07:30:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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