Re: cpu usage

Hi Russ,

Thanks for the advice.

I am using maillog file since a year past without any problem the
problem of 100% cpu usage started just a month back.

I never added tarpit count and delay rest other options i was using
them. I have added now will observe it for 2 days and let you know the
status.

Regards,
Mario


On Thu, 2008-09-11 at 10:21 -0400, Russell Simpkins wrote:

> >
> > 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
>