On Tue, 25 Sep 2001, Jason Hough wrote:
> Hey guys... need some help. When people here at the office try to send
> email, it takes anywhere from 30 seconds to a few minutes before the
> *connects* to the SMTP server.
> POP works fine, nice and fast.
> I've added entries for the Queb3 into our hosts file, and everyone can
ping
> it fine. It appears to be only SMTP thats running at a snails pace. It
It's not really the Qube, it's sendmail and your firewall most likely,
sendmail makes a reverse connection to the machine connecting to it via
the ident (auth) protocol to try to check if you are who you say you
are. Your firewall probably doesn't forward it, and even if it did,
windows machines usually don't listen to the requests. Thus sendmail has
to timeout for 30 seconds before continuing. You can disable this
behavious if you want, it's next to useless anyhow ;)
in /etc/sendmail.cf , find
#O Timeout.ident=30s
remove the # and change the timeout to 1 or so...
also, make sure reverse dns works for the IP your machines are exposing to
the mail server....(eg IP -> somename) or this will hang sendmail, tho it
usually hangs pop also, so i think you have this ok)
> Top does report that of the 296mb of RAM, only 4 megs is free??? How could
> that be, it's hardly running anything? Any way I can find out specifically
> where all the memory is going?
Because memory not used by applications is used to buffer the disk, this
is good....be happy :)
All that other stuff top tells you includes the memory in use by
applications, SIZE, RSS, and SHRD are memory used by that program, SIZE is
probably most relevant to what you are asking :)
PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
5305 httpd 6 0 2260 1496 1048 S 0 0.5 4.8 0:00 httpd
This says that httpd is running as user httpd, has a normal priority (eg
is allowed to use as much cpu time as any other thing at that
(normal) priority) , isn't niced (lowered priority) , has a total memory
footprint of 2.2 meg, is using 1.4 meg of real ram (the rest is shared or
swapped) , and is sharing 1.048 meg with other programs (probably other
copies of itself and system libraries, this memory only gets used once and
is shared by all the programs that use the same code) , it's using 1/2 %
of the total cpu time, and 4.8% of the total memory (Real ram) and has
been running for less than 1 second [I caught this one just as it was
starting up ;]
gsh
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