From owner-freebsd-net@FreeBSD.ORG  Sat Dec  4 19:15:29 2004
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 28BA716A4CE; Sat,  4 Dec 2004 19:15:29 +0000 (GMT)
Received: from burka.carrier.kiev.ua (burka.carrier.kiev.ua [193.193.193.107])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 2D6D843D60; Sat,  4 Dec 2004 19:15:27 +0000 (GMT)
	(envelope-from netch@lucky.net)
Received: from burka.carrier.kiev.ua (netch@localhost [127.0.0.1])
	by burka.carrier.kiev.ua with ESMTP id iB4JF801058839;
	Sat, 4 Dec 2004 21:15:12 +0200 (EET)
	(envelope-from netch@burka.carrier.kiev.ua)
Received: (from netch@localhost)
	by burka.carrier.kiev.ua (8.12.11/8.12.11/Submit) id iB4JF8fb058836;
	Sat, 4 Dec 2004 21:15:08 +0200 (EET)
	(envelope-from netch)
Date: Sat, 4 Dec 2004 21:15:08 +0200
From: Valentin Nechayev <netch@lucky.net>
To: Gleb Smirnoff <glebius@freebsd.org>
Message-ID: <20041204191508.GA18236@lucky.net>
References: <20041125140641.GA78210@cell.sick.ru>
	<20041126025510.GA44246@scylla.towardex.com>
	<20041126091316.GA84369@cell.sick.ru> <41AB3CB9.598BB2FB@freebsd.org>
	<20041129161529.GA4770@cell.sick.ru>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20041129161529.GA4770@cell.sick.ru>
X-42: On
X-Verify-Sender: Address <netch@burka.carrier.kiev.ua> has been verified
	(burka.carrier.kiev.ua)
X-Antivirus: Dr.Web (R) for Mail Servers on kozlik.carrier.kiev.ua host
X-Antivirus-Code: 100000
cc: James <haesu@towardex.com>
cc: Andre Oppermann <andre@freebsd.org>
cc: net@freebsd.org
Subject: Re: route cacheing for gif(4) should be optional
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: netch@lucky.net
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 04 Dec 2004 19:15:29 -0000

Hi,

 Mon, Nov 29, 2004 at 19:15:29, glebius wrote about "Re: route cacheing for gif(4) should be optional": 

A>> However there have been reasons for
A>> storing the rtentry pointer in struct gif.  In the old days ip_output()
A>> required an rtentry pointer to be passed on, this is no longer the case.
A>> And it was sort of a safe-guard to make it harder to send the gif encapsulated
A>> packets back through the same gif interface.  That didn't work really well
A>> and as I say it should be scapped instead of rigged on somewhere else with
A>> yet another obscure option. ;)

> As soon as I make route cacheing optional, I'd like to make it off by default.
> Let me explain: FreeBSD is stable by default, not fast. Routecacheing is not stable.
> When a route flap occurs in dynamicly routed network my gif tunnels are stuck.
> I'll describe in manpage, that more performance can be achieved by enabling this
> route cacheing.  Any objections on this default?

Tracking Cisco & etc. footsteps, there is yet another variant: add cached
route with aging and set default aging time very small (e.g. 1 sec).
This can give preferences of caching among with satisfactory time of renewal.
I think this will be best variant, but if in a case it isn't adoptable,
let's caching will be disabled totally by default.


-netch-