Re: cpu usage

>
> Hi Russ,
>
> There is no problem if kernel allows qmail-smtpd for 100% cpu usage but
> the load average should not go high. which means there are more request
> waiting for the processor.
>
>
> Please help me with this issue
>
> Below is the output of top and vmstat.
>
>
> Output of  *** TOP ***
>
>
>  12:15:53  up 37 days,  5:10,  4 users,  load average: 32.13, 31.24,
> 30.32
> 156 processes: 123 sleeping, 33 running, 0 zombie, 0 stopped
> CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
>            total   98.5%    1.1%    0.2%   0.0%     0.0%    0.0%    0.0%
>            cpu00   98.6%    0.7%    0.5%   0.0%     0.0%    0.0%    0.0%
>            cpu01   98.4%    1.5%    0.0%   0.0%     0.0%    0.0%    0.0%
> Mem:   244072k av,  234236k used,    9836k free,       0k shrd,   34580k
> buff
>                      74336k actv,   10812k in_d,    1744k in_c
> Swap: 1052248k av,   30248k used, 1022000k free                   42360k
> cached
>
>   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU
> COMMAND
> 26509 root      25   0   180  180   104 R     3.9  0.0  54:16   1
> qmail-smtpd
> 27131 root      25   0   180  180   104 R     3.9  0.0  35:45   0
> qmail-smtpd
> 27939 root      25   0   180  180   104 R     3.9  0.0  26:53   1
> qmail-smtpd
> 28198 root      25   0   180  176   104 R     3.9  0.0  24:13   0
> qmail-smtpd
> 28307 root      25   0   180  180   104 R     3.9  0.0  23:43   0
> qmail-smtpd
> 29099 root      25   0   188  188   112 R     3.9  0.0  16:32   1
> qmail-smtpd
> 29460 root      25   0   268  268   192 R     3.9  0.1  14:32   1
> qmail-smtpd
> 29540 root      25   0   264  264   192 R     3.9  0.1  13:47   0
> qmail-smtpd
> 30162 root      25   0   268  268   192 R     3.9  0.1   9:36   1
> qmail-smtpd
> 32114 root      25   0   448  448   372 R     3.9  0.1   2:05   1
> qmail-smtpd
> 28777 root      25   0   188  188   112 R     3.7  0.0  19:00   1
> qmail-smtpd
> 30403 root      25   0   268  268   192 R     3.6  0.1   8:43   1
> qmail-smtpd
> 30390 root      25   0   268  268   192 R     3.1  0.1   8:35   0
> qmail-smtpd
> 26009 root      25   0   180  180   104 R     2.9  0.0  91:38   1
> qmail-smtpd
> 26236 root      25   0   176  176   104 R     2.9  0.0  70:51   0
> qmail-smtpd
> 26434 root      25   0   176  176   104 R     2.9  0.0  57:30   0
> qmail-smtpd
> 26629 root      25   0   180  180   104 R     2.9  0.0  47:31   0
> qmail-smtpd
> 26902 root      25   0   180  180   104 R     2.9  0.0  41:03   1
> qmail-smtpd
> 26957 root      25   0   184  180   104 R     2.9  0.0  41:45   1
> qmail-smtpd
> 27411 root      25   0   180  180   104 R     2.9  0.0  33:25   1
> qmail-smtpd
> 28855 root      25   0   188  188   112 R     2.9  0.0  18:45   0
> qmail-smtpd
> 29879 root      25   0   264  264   192 R     2.9  0.1  12:10   1
> qmail-smtpd
> 25937 root      25   0   180  180   104 R     2.9  0.0  92:05   1
> qmail-smtpd
> 30694 root      25   0   444  444   372 R     2.9  0.1   7:38   1
> qmail-smtpd
> 31109 root      25   0   448  448   372 R     2.9  0.1   4:58   0
> qmail-smtpd
> 31251 root      25   0   444  444   372 R     2.9  0.1   4:22   1
> qmail-smtpd
> 31439 root      25   0   448  448   372 R     2.9  0.1   3:43   0
> qmail-smtpd
> 32657 root      25   0   448  448   372 R     2.9  0.1   0:18   0
> qmail-smtpd
> 32661 root      25   0   448  448   372 R     2.9  0.1   0:19   0
> qmail-smtpd
> 28052 root      39  15   176  176   104 R N   0.5  0.0   6:35   0
> qmail-smtpd
> 27108 root      39  19   176  176   104 R N   0.2  0.0  15:57   0
> qmail-smtpd
> 27794 root      39  19   180  180   104 R N   0.2  0.0   7:16   0
> qmail-smtpd
>
>
> Output of vmstat for every 2sec
>
>
> procs                      memory      swap          io     system
> cpu
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy
> id wa
> 34  0  29152  82484   3380  18852    0    0     0    56  136    52 100
> 0  0  0



Well, you sure do have something there. At least nothing is blocked. Does
this go away if you restart qmail? How long does it take to get back up to
100%. Your logs sure aren't showing off the activity. I would stop qmail,
make sure everything is shutdown, then restart and watch the logs to see
how fast it spikes. Also, make sure you verify you don't have a massive
maillog file.


Why are you running qmail-smtpd as root? You really should not do that.

I wonder if you have someone spamming from your server. Do you have
MAXRCPTCOUNT set? I would turn that on if you don't. I've seen people try
to bcc 1000's of people which can be a drag on your system.

cat /etc/tcp.smtp
127.:allow,RELAYCLIENT="",RCPTCHECK="",RETURNMXCHECK="",SANITYCHECK="",MAXRCPTCOUNT="50",TARPITCOUNT="10",TARPITDELAY="5"
:allow,SMTPAUTH="",RCPTCHECK="",SENDERCHECK="",RETURNMXCHECK="",SANITYCHECK="",MAXRCPTCOUNT="50",TARPITCOUNT="10",TARPITDELAY="5"

Russ