From owner-freebsd-hackers  Mon Jun 12  0:53:51 2000
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From: Reinier Bezuidenhout <rbezuide@oskar.dev.nanoteq.co.za>
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Subject: Re: Fastforwarding
In-Reply-To: <200006120705.JAA13935@info.iet.unipi.it> from Luigi Rizzo at "Jun 12, 2000  9: 5:52 am"
To: luigi@info.iet.unipi.it (Luigi Rizzo)
Date: Mon, 12 Jun 2000 09:53:28 +0200 (SAT)
Cc: lists@security.za.net, hackers@FreeBSD.ORG
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> > 
> > Has anyone here tried setting net.inet.ip.fastforwarding on in a high
> > traffic enviroment?
> > 
> > This setting DRASTICALLY speeds up transfers between boxes talking through
> > a freebsd gateway when you are using 2 100mbit interfaces, but it seems to
> > kernel panic the system after a few minutes.
> 
> can you quantify the "drastically" ?
> 
> 	luigi
> 

This also depends on what 100mbit cards you are using ... we had problems
with the Intel ether express cards when using X-over cables (yes :) Intel
specs that these cards should NOT be used with X-overs) ... this caused 
the cards to go in some reset stage where no packets are transfered and the
mbufs heap up and eventually could cause a panic.

this happend when configured as abridge and doing 100mbit full-duplex transfers,
we fixed this by using a switch and removing the X-overs.

Also have a look at increasing the mbufs .. I don't know if the mbuf exaustion
panic has been fixed .. anyone ??

Reinier



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