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2026-06-18 - 05:45

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 all highest latencies:
System rackfslot4s.osadl.org (updated Thu Jun 18, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1665921220,2chrt16660-21chrt21:23:100
799921200,2chrt7997-21sshd22:47:150
3196121180,3chrt31963-21latency_hist22:35:050
2740321180,2chrt27404-21sh23:16:200
1853321170,3chrt18536-21modprobe22:15:010
2870221160,4chrt28700-21ntpq20:50:580
2284621160,4chrt22845-21/usr/sbin/munin22:21:020
2134621160,2chrt21349-21cut23:56:080
3234021140,2chrt32339-21aten2.4-expect22:35:340
3079021140,2chrt30791-21runrttasks21:44:210
914921130,3chrt9148-21/usr/sbin/munin22:00:350
1832521130,3chrt18326-21missed_timers23:51:170
2694621120,2chrt26947-21/usr/sbin/munin21:38:110
2433721120,3chrt24338-21runrttasks23:11:460
1558821120,1sleep015589-21seq22:59:030
3193421110,3chrt31935-21sh19:12:320
793921100,4chrt7941-21cut23:36:230
1371121100,3chrt13712-21sleep22:07:020
3055421090,3chrt30551-21irqstats23:21:060
2466421090,2chrt24665-21sleep00:01:060
2073621080,2chrt20737-21sleep20:39:240
1307821080,2chrt13077-21seq19:35:230
920621070,2chrt9207-21sh19:28:360
417321060,2chrt4174-21sleep21:52:270
1436121000,1sleep014362-21fschecks_count23:45:490
189152900,2sleep018917-21cut22:15:320
119122890,3chrt11897-21diskstats00:30:470
158962880,2sleep015899-21cut20:31:200
81382800,2sleep08139-21tune2fs21:10:550
293972799,17sleep029401-21sleep19:09:090
229062780,2sleep022907-21cat19:50:420
242272770,2sleep024228-21seq20:45:050
70612750,2sleep07063-21chrt00:23:080
56622750,1sleep05663-21chrt22:44:060
42442720,2sleep04242-21idleruntime19:20:400
263882690,1sleep026392-21timerwakeupswit20:47:180
14602680,2sleep01464-21cut23:26:090
31052650,1sleep03106-21irqrtprio20:10:440
47442610,2sleep04745-21uname23:31:080
54642600,1sleep05465-21aten2.4_rfpower20:15:210
87762570,2sleep08778-21cut20:20:250
194032560,2sleep019405-21cut19:45:240
109912560,2sleep010992-21seq00:29:240
113152550,2sleep011313-21ps19:31:230
56122520,1sleep05613-21basename21:55:310
12972510,2sleep01296-21seq21:48:310
125102510,3chrt12386-21ssh23:42:210
29787905021,22cyclictest0-21swapper21:17:340
29787905018,23cyclictest0-21swapper22:52:380
33592490,2chrt1292-21/usr/sbin/munin00:17:260
183862490,2sleep018387-21seq21:25:590
298162460,2chrt29805-21ssh00:09:000
216562460,3sleep021655-21seq23:07:380
29787904516,20cyclictest0-21swapper00:10:070
29787904513,23cyclictest3052-21sleep19:18:490
29787904511,14cyclictest12904-21ntpq20:26:150
29787904415,20cyclictest0-21swapper00:38:450
29787904323,13cyclictest2184-21latency_hist20:10:030
29787904312,22cyclictest21854-21ssh21:31:040
190992430,3sleep019100-21sh23:04:270
2978790425,10cyclictest26640-21ntpq19:56:090
2978790424,19cyclictest2671-21ntp_states21:01:170
29787904218,14cyclictest27170-21rm22:27:130
2978790415,10cyclictest29587-21ntpq20:00:530
2978790404,28cyclictest17015-21chrt19:40:470
2978790395,11cyclictest31036-21df_inode20:55:280
29787903914,10cyclictest7414-21munin-plugin-st21:10:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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