From owner-freebsd-hackers@FreeBSD.ORG  Sat Mar  9 07:16:36 2013
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id B150971B;
 Sat,  9 Mar 2013 07:16:36 +0000 (UTC)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
 [188.252.31.196])
 by mx1.freebsd.org (Postfix) with ESMTP id 27FDEE55;
 Sat,  9 Mar 2013 07:16:35 +0000 (UTC)
Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1])
 by wojtek.tensor.gdynia.pl (8.14.6/8.14.5) with ESMTP id r297GL9p072005;
 Sat, 9 Mar 2013 08:16:21 +0100 (CET)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
 by wojtek.tensor.gdynia.pl (8.14.6/8.14.5/Submit) with ESMTP id r297GKKB072002;
 Sat, 9 Mar 2013 08:16:20 +0100 (CET)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Sat, 9 Mar 2013 08:16:20 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: freebsd-hackers@freebsd.org
Subject: Re: lots of network interfaces
In-Reply-To: <44y5dx3gx3.fsf@lowell-desk.lan>
Message-ID: <alpine.BSF.2.00.1303090815270.72001@wojtek.tensor.gdynia.pl>
References: <alpine.BSF.2.00.1303071222550.10489@wojtek.tensor.gdynia.pl>
 <031201ce1b91$841b90d0$8c52b270$@freebsd.org>
 <44y5dx3gx3.fsf@lowell-desk.lan>
User-Agent: Alpine 2.00 (BSF 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7
 (wojtek.tensor.gdynia.pl [127.0.0.1]); Sat, 09 Mar 2013 08:16:21 +0100 (CET)
Cc: dteske@freebsd.org, devin.teske@fisglobal.com
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 09 Mar 2013 07:16:36 -0000

>> very usable at that point, ifconfig aside).
>
> The interfaces are a linked list, plus there's a separate kernel dive
> for each interface.  The list (as opposed to individual interfaces) is

i don't care how fast ifconfig displays them, just for how fast things 
like routing or ipfw rule like "via tun196" would work.

if it is hashed somehow - fine.
if not - very bad.