From owner-freebsd-current  Tue May 19 07:45:42 1998
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To: Eivind Eklund <eivind@yes.no>
cc: current@FreeBSD.ORG
Subject: Re: cvs commit: src/sys/conf files src/sys/net if_ethersubr.c if_fddisubr.c if_ppp.c src/sys/netinet ip_flow.c in.h in_var.h ip_fw.c ip_input.c ip_var.h 
In-reply-to: Your message of "Tue, 19 May 1998 16:37:34 +0200."
             <19980519163734.18175@follo.net> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Tue, 19 May 1998 07:45:39 -0700
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>>   This is a standard part of FreeBSD, but must be enabled with:
>>   "sysctl -w net.inet.ip.fastforwarding=1" ...and of course forwarding must
>
>Why is this?  What are the downsides - just that it is temporary code?

   Because there are several cases where using this might be bad. One of them
I mentioned in the commit message - it will have bad behavior if the number
of active paths is greater than IPFLOW_MAX (currently 256). It may also
interact badly with route changes, although it has code in it to avoid this.
Finally, I still consider it somewhat experimental - I don't currently have
the hardware resources to give it a thorough shakeout.
   There is also plenty of room for further optimization, however I intend
to discuss this in a different forum (probably freebsd-net).

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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