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Date: Tue, 18 May 2004 02:43:46 -0700
From: Luigi Rizzo <rizzo@icir.org>
To: Pawel Jakub Dawidek <pjd@freebsd.org>
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	from pjd@freebsd.org on Tue, May 18, 2004 at 11:24:39AM +0200
cc: freebsd-net@freebsd.org
Subject: Re: ia_netbroadcast
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On Tue, May 18, 2004 at 11:24:39AM +0200, Pawel Jakub Dawidek wrote:
> Hi.
> 
> Do we still need ia_netboradcast field? It is calculated depending on
> old-fashion classes (A, B, C). Is it used still?
> I wonder if ia_broadaddr isn't sufficient today.

not just that, it seems that ia_netboradcast contains bogus info.
This said, how do you plan to handle the alias search, by
implementing a per-interface hash table containing the
addresses and broadcast addresses ?

	cheers
	luigi

> IP		netmask		ia_broadaddr	ia_netbroadcast
> 10.0.0.101	255.0.0.0	10.255.255.255	10.255.255.255
> 1.0.0.2		255.255.255.252	1.0.0.3		1.255.255.255
> 2.0.0.1		255.255.0.0	2.0.255.255	2.255.255.255
> 
> I'm planing to work on removing O(n) from interface aliases search.
> Now every incoming packet have to be compared with every single
> broadcast from every single alias. When I tested something and
> there were ~10000 aliases on interface it worked really slow.
> 
> This slowdown probably exists in more places. It exists in NetBSD and
> OpenBSD as well.
> 
> -- 
> Pawel Jakub Dawidek                       http://www.FreeBSD.org
> pjd@FreeBSD.org                           http://garage.freebsd.pl
> FreeBSD committer                         Am I Evil? Yes, I Am!