Re: 2.3.99pre5: one process monopolizing network traffic

From: Christoph Lameter (christoph@lameter.com)
Date: Thu Apr 27 2000 - 11:56:24 EST


Here is the process list as you requested. Finger is hanging:
  PID COMMAND WCHAN
    1 init [2] select
    2 [kswapd] wait_on_page
    3 [kflushd] bdflush
    4 [kupdate] kupdate
  137 /sbin/syslogd select
  139 /sbin/klogd syslog
  143 /usr/sbin/watchd nanosleep
  151 /sbin/portmap select
  154 /usr/sbin/named select
  162 /usr/sbin/dhcpd- select
  165 dictd 1.4.9: 0/0 wait_for_connect
  171 /usr/sbin/gpm -m select
  176 /usr/sbin/inetd select
  182 /usr/sbin/lpd select
  190 /sbin/modclean nanosleep
  195 /usr/sbin/rpc.st select
  199 /usr/sbin/oident wait_for_connect
  203 /usr/sbin/nmbd - select
  205 /usr/sbin/nmbd - pipe_wait
  206 /usr/sbin/smbd - select
  215 /usr/sbin/sshd select
  222 /usr/X11R6/bin/x select
  223 /usr/sbin/ntpd select
  226 /usr/sbin/icmplo wait_for_packet
  229 /usr/sbin/tcplog wait_for_packet
  263 /usr/sbin/cron nanosleep
  268 /usr/sbin/apache select
  271 /usr/sbin/apache posix_lock_file
  272 /usr/sbin/apache posix_lock_file
  274 /usr/sbin/apache posix_lock_file
  276 /usr/bin/gdm poll
  282 -bash read_chan
  283 /sbin/getty 3840 read_chan
  284 /sbin/getty 3840 read_chan
  285 /sbin/getty 3840 read_chan
  286 /sbin/getty 3840 read_chan
  287 /sbin/getty 3840 read_chan
  376 /usr/bin/X11/X v -
  377 /usr/bin/gdm wait4
  379 /usr/X11R6/bin/x unix_stream_data_wait
  387 kwm select
  405 [kwmsound <defun exit
  406 kfm select
  407 krootwm select
  408 kpanel select
  409 kbgndwm select
  420 kvt -T ption Ter select
  421 bash wait4
  425 xchat -c poll
  426 netscape select
  427 (dns helper) select
  452 kvt -T ption Ter select
  453 bash wait4
  665 /usr/sbin/smbd - select
 1655 /usr/sbin/apache posix_lock_file
 2777 /usr/sbin/apache posix_lock_file
 2778 /usr/sbin/apache posix_lock_file
 2779 /usr/sbin/apache posix_lock_file
10341 /usr/sbin/apache wait_for_connect
17031 pine select
17065 bash wait4
17082 kvt -T ption Ter select
17083 bash wait4
17098 kvt -T ption Ter select
17099 bash wait4
17102 ssh openrock select
17106 apt-get dist-upg select
17110 /usr/lib/apt/met select
17111 /usr/lib/apt/met select
17112 exim -bs tcp_data_wait
17133 exim -bs tcp_data_wait
17153 finger ftp.kern poll
17154 kvt -T ption Ter select
17155 bash wait4
17158 ps -eo pid,args, -
17159 [watchdog <defun exit

On 27 Apr 2000, Andi Kleen wrote:

> Christoph Lameter <christoph@lameter.com> writes:
>
> > I have seen it repeatedly
> >
> > One process is doing heavy i/o
> >
> > Other processes can no longer access the network.
> >
> > i.e. finger @ftp.kernel.org keeps stalling, ssh connections not
> > established etc. Irc is getting extremely bursty.
> >
> > If I get 2.2.14 up all will be fine.
>
> Where does the network process hang (check with ps -eo pid,args,wchan) ?
>
> It probably cannot get a free page to send the packet and is waiting for
> memory.
>
> -Andi
>
>
>

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