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2025-12-24 - 01:50

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 50 highest latencies:
System rackfslot4s.osadl.org (updated Tue Dec 23, 2025 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2110221320,2sleep021103-21chrt09:06:000
1180121240,3chrt11804-21ssh12:06:210
1332921230,3chrt13053-21apt-get11:20:330
218921210,2chrt2179-21diskstats10:15:470
144621210,2chrt1444-21ld11:02:310
3025921190,2chrt30254-21ntp_states10:57:030
2840521190,2chrt28406-21seq12:31:200
2344021150,2chrt23441-21sleep09:58:370
129921150,3chrt1301-21seq10:14:280
3257321140,2chrt32574-21sh08:33:230
2728021140,2sleep027281-21df_inode08:25:310
2511821130,3chrt25119-21chrt08:21:160
2262121130,2sleep022622-21chrt11:34:240
1027421130,3chrt10275-21sleep11:15:570
3033721120,1sleep030338-21cut09:20:510
1559021110,1sleep015592-21proc_pri12:12:120
684121100,2sleep06842-21runrttasks11:59:360
1450921090,2chrt14510-21seq08:05:150
97421080,2sleep0976-21cut09:25:380
1203821080,3chrt12039-21seq09:41:260
1409821070,2chrt14099-21sleep08:04:270
2854721060,2sleep028549-21cut07:35:360
2782921060,2chrt27830-21sleep07:34:520
2350321060,1sleep023504-21cat09:10:390
128121060,2chrt1279-21/usr/sbin/munin11:51:000
3147221030,3chrt31473-21sh11:47:130
960621010,2chrt9607-21sleep08:47:370
1986521010,3chrt19866-21sh08:13:150
96992970,2sleep09700-21runrttasks09:38:040
258032950,2sleep025804-21seq12:27:210
243782930,2sleep024379-21seq10:48:150
161562880,2sleep016157-21chrt07:15:360
322472860,2sleep032248-21chrt07:40:520
57172850,2sleep05718-21sh11:09:050
236812850,2sleep023682-21tune2fs11:35:550
94902840,1sleep09491-21latency_hist11:15:030
33132830,2sleep03314-21basename07:46:260
267182790,2sleep026719-21chrt10:51:380
63282710,1sleep06329-21proc_pri07:51:220
268432700,2sleep026845-21cpuspeed09:15:380
84352690,2sleep08438-21fschecks_count07:55:350
256282640,2sleep025631-21sed10:01:360
206782640,2sleep020679-21seq10:42:210
40442630,2sleep04047-21cut08:40:010
71932620,2sleep07194-21sh10:22:370
153012590,2sleep015302-21runrttasks07:14:340
191312587,7sleep0228-21usb-storage12:17:220
174292583,9sleep017472-21apt09:50:110
162352583,8sleep015007-21apt-get10:36:290
138432583,45sleep013871-21/usr/sbin/munin10:32:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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