wired top (and others) behavior - broken CPU usage reporting ?

From: Vladimir Grebenschikov <vova_at_fbsd.ru>
Date: Tue, 05 Sep 2006 11:45:58 +0400
Hi 

I have notice that it is no more possible to find what process is eats
all CPU time with top, vmstat and tools like that. This happens with
current some (big) time ago.

See here vmstat (vm mode) output:

 3.3%Sys   0.8%Intr 95.9%User  0.0%Nice  0.0%Idle        %ozfod   128
rtc irq8
|    |    |    |    |    |    |    |    |    |    |       daefr    66
cbb0 pcm0+
==>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>        prcfr     1
ata0 irq14
                                        33 dtbuf       47 totfr
ata1 irq15
Namei     Name-cache   Dir-cache     69694 desvn          react
   Calls    hits   %    hits   %     15144 numvn          pdwak
    1259    1259 100                  9063 frevn          pdpgs
                                                          intrn

99.5% CPU used in user space.

now top output (sorted by CPU):
last pid:  2024;  load averages:  1.03,  0.65, 0.40 up 0+01:28:34
11:38:50
120 processes: 4 running, 116 sleeping
CPU states: 95.7% user,  0.0% nice,  3.5% system,  0.8% interrupt,  0.0%
idle
Mem: 589M Active, 209M Inact, 146M Wired, 512K Cache, 111M Buf, 46M Free
Swap: 1200M Total, 1200M Free

  PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME   WCPU
COMMAND
  927 root          1  97    0 52084K 28172K select   1:02  2.98% Xorg
 1128 vova          1  96    0 21172K 13676K select   0:10  0.98%
metacity
 1252 vova          1  96    0 38024K 29884K select   1:56  0.63%
skype_bin
 1386 vova         11 126    0   516M   470M RUN      3:42  0.00%
evolution-2.6
 1134 vova          3  20    0 21540K 13496K kserel   1:38  0.00%
gkrellm
 1113 vova          1  96    0 19592K  9604K select   0:17  0.00%
at-spi-registryd
 1327 vova          1  96    0 34464K 24668K select   0:10  0.00% sim
 1323 vova          1  96    0 24552K 17212K select   0:09  0.00%
cpufreq-applet
...


No any idea who eats these 95.5% of CPU time. 
Same picture on vmstat's pigs screen.

I know that this process is actually evolution, and if I kill it system
load drops, but why it is not shown by top (and other).

Any hints about it ?

-- 
Vladimir B. Grebenschikov
vova_at_fbsd.ru
Received on Tue Sep 05 2006 - 05:46:01 UTC

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