From owner-freebsd-net@FreeBSD.ORG  Thu Feb 22 16:11:32 2007
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: freebsd-net@freebsd.org
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 2CDF916A401
	for <freebsd-net@freebsd.org>; Thu, 22 Feb 2007 16:11:32 +0000 (UTC)
	(envelope-from mav@alkar.net)
Received: from cmail.optima.ua (cmail.optima.ua [195.248.191.121])
	by mx1.freebsd.org (Postfix) with ESMTP id 8DC5C13C4A7
	for <freebsd-net@freebsd.org>; Thu, 22 Feb 2007 16:11:31 +0000 (UTC)
	(envelope-from mav@alkar.net)
Received: from [212.86.226.11] (account mav@alkar.net [212.86.226.11] verified)
	by cmail.optima.ua (CommuniGate Pro SMTP 5.0.11)
	with ESMTPA id 21089294; Thu, 22 Feb 2007 18:10:58 +0200
Message-ID: <45DDC091.3060903@alkar.net>
Date: Thu, 22 Feb 2007 18:10:57 +0200
From: Alexander Motin <mav@alkar.net>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8b) Gecko/20051108
MIME-Version: 1.0
To: Alex Povolotsky <tarkhil@webmail.sub.ru>
References: <1172056982.00691952.1172043601@10.7.7.3>	<45DC2FC1.3030408@alkar.net>	<45DC3718.7010804@webmail.sub.ru>
	<45DC39BC.5020707@alkar.net>	<45DC44AF.30005@webmail.sub.ru>
	<45DC4640.8030309@alkar.net> <45DDBBB3.3020900@webmail.sub.ru>
In-Reply-To: <45DDBBB3.3020900@webmail.sub.ru>
Content-Type: text/plain; charset=KOI8-R; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-net@freebsd.org
Subject: Re: mpd success stories, anyone?
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
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: Thu, 22 Feb 2007 16:11:32 -0000

Alex Povolotsky wrote:
> Thanks, it seems to be more or less stable; however, throughput is quite 
> little, lots of packets lost and "No buffer space available" on attempt 
> to ping VPN addresses (only VPN is affected).

Have you tried to disable PPTP windowing in mpd config? ENOBUFS is the 
errno used by ng_pptp node's windowing code when outgoing window is 
full. It is not related to any system tunables. Maximum window size in 
current ng_pptp is 16 packets. It can be small for LFNs and can reduce 
speed.

> I guess I should tune some kernel tunable, but what specific one?

I can recomend you to set
net.graph.maxdgram=524288 

net.graph.recvspace=524288 

to make 'ngctl list' command work, but it is not critical.

-- 
Alexander Motin mav@alkar.net
Optima Telecom