*BSD News Article 67723


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: What is this mean? ==>  in_rtqtimo
Date: 4 May 1996 21:06:03 GMT
Organization: Private BSD site, Dresden
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"Robert L. Hatch" <rlhatch@home.ifx.net> wrote:
> in_rtqtimo: adjusted rtq_reallyold to 2400
> in_rtqtimo: adjusted rtq_reallyold to 1600
> in_rtqtimo: adjusted rtq_reallyold to 1066
> in_rtqtimo: adjusted rtq_reallyold to 710                 

> What do the last four lines (in_rtqtime:...) mean?  Is this
something I need to be concerned about?

Disclaimer: The following is how i understood it.  I might be
incorrect.

Background: For each network route that applies to a particular
destination, this route will be cloned into a (temporary) host route
for this destination host.  This is done for several reasons, one of
them being efficiency (host routes are very efficient).  You can see
all these cloned routes with ``netstat -ra''.

These cloned routes expire after some certain amount of time.  The
expiration parameters can be controlled by some sysctl(8) variables
(net.inet.ip.rt*).  Since the cloned routes eat up memory, a machine
that does a lot of routing might use too much memory for keeping
potentially stale cloned routes, and so the system protects itself by
adjusting the expiration time.  The syslog message is left as an
indication of this happening, and perhaps as an indication to the
operator that the machine is running slowly out of some buffer memory.

However, short of adding more phyiscal RAM to the machine, please
don't ask me for which parameter to tune.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)