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2026-05-18 - 05:51

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 Mon May 18, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2913721400,2sleep029138-21seq22:48:280
330521240,2chrt2775-21apt-get00:35:320
3080721220,2chrt30808-21chrt23:40:010
462821180,3chrt4606-21ntpq22:11:440
1310321180,2chrt11786-21apt-get00:01:390
1904121170,2sleep019045-21seq22:33:240
3224021160,2chrt32239-21ssh23:41:220
2052621160,3chrt20522-21ps00:12:140
554021150,2sleep05541-21missed_timers23:01:160
2268921150,2sleep022688-21grep20:10:030
1954721150,3chrt19546-21/usr/sbin/munin21:45:580
1684521140,3chrt16844-21ssh00:06:370
687221130,2chrt6873-21chrt23:51:540
2408521120,2chrt24086-21basename21:52:220
911021110,2sleep09117-21chrt23:06:420
2020821110,3chrt20210-21awk22:35:340
3129021100,2chrt31289-21seq22:03:090
1939421100,2chrt19391-21proc_pri23:22:120
3131721090,2sleep031318-21chrt00:28:350
2737321080,3chrt27374-21runrttasks23:34:520
1339821070,2chrt13399-21sleep19:55:060
2512521060,2chrt25122-21entropy21:05:360
1824221060,1sleep018243-21runrttasks21:43:580
1566121060,2chrt15662-21runrttasks22:28:180
1531521040,2sleep015317-21hostname20:50:230
2584521020,3chrt25846-21sh20:15:070
2331821020,2chrt23319-21sh19:18:160
2402621010,2sleep024027-21cat00:17:220
296772890,2sleep029678-21mii-tool20:20:440
136552890,1sleep013656-21seq20:46:290
37122860,2sleep03713-21chrt23:47:230
228242850,2sleep022825-21chrt20:10:200
48632820,2sleep04864-21runrttasks21:24:020
175072820,2sleep017508-21seq23:20:010
292932790,3sleep029295-21ntpq21:11:420
13042770,1sleep01305-21/usr/sbin/munin22:55:350
110782770,2sleep011080-21cut19:50:440
264322710,2sleep026436-21grep21:56:070
77652700,2sleep07766-21seq21:28:000
233072690,2sleep023308-21seq23:28:050
117202670,1sleep011721-21chrt21:34:260
157372664,10sleep015747-21ntpq19:05:400
6282650,2sleep0627-21seq22:54:340
308862640,16chrt30876-21hddtemp_smartct19:30:380
63362600,1sleep06337-21seq19:43:020
26092584,7sleep02584-21latency_hist20:30:030
69622574,45sleep06966-21df_inode22:15:450
139082573,45sleep013931-21seq21:37:190
76062553,8sleep07609-21diskstats19:45:340
194742543,42sleep023942-21kworker/u2:320:05:000
11772540,3sleep01179-21ntp_kernel_pll_22:06:340
96902532,7sleep09675-21ssh23:56:100
119222520,1sleep011923-21cat22:22:280
28172514,6sleep02762-21apt-get20:30:220
122812513,7sleep012276-21ssh23:11:260
24912500,2sleep02492-21seq00:34:230
242312500,3sleep024232-21seq19:20:240
237652490,1sleep023772-21/usr/sbin/munin22:40:480
17786904919,24cyclictest0-21swapper00:24:360
17786904616,23cyclictest0-21swapper21:19:350
283232450,3chrt28322-21seq19:25:550
21142450,3chrt2113-21seq19:35:580
62252433,33sleep06230-21diskstats20:35:340
1778690424,10cyclictest23270-21ntpq21:02:110
207652401,4sleep00-21swapper20:58:480
1778690394,8cyclictest18251-21df19:10:280
17786903913,9cyclictest9507-21hddtemp_smartct20:40:380
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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