From owner-freebsd-pf@FreeBSD.ORG  Thu Aug  2 06:24:15 2007
Return-Path: <owner-freebsd-pf@FreeBSD.ORG>
Delivered-To: freebsd-pf@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C06A016A41F
	for <freebsd-pf@freebsd.org>; Thu,  2 Aug 2007 06:24:15 +0000 (UTC)
	(envelope-from dhartmei@insomnia.benzedrine.cx)
Received: from insomnia.benzedrine.cx (insomnia.benzedrine.cx
	[IPv6:2001:6f8:1098::2])
	by mx1.freebsd.org (Postfix) with ESMTP id 6C74A13C4A6
	for <freebsd-pf@freebsd.org>; Thu,  2 Aug 2007 06:24:14 +0000 (UTC)
	(envelope-from dhartmei@insomnia.benzedrine.cx)
Received: from insomnia.benzedrine.cx (localhost.benzedrine.cx [127.0.0.1])
	by insomnia.benzedrine.cx (8.14.1/8.13.4) with ESMTP id l726OEV3020294
	(version=TLSv1/SSLv3 cipher=DHE-DSS-AES256-SHA bits=256 verify=NO);
	Thu, 2 Aug 2007 08:24:14 +0200 (MEST)
Received: (from dhartmei@localhost)
	by insomnia.benzedrine.cx (8.14.1/8.12.10/Submit) id l726OD1L029003;
	Thu, 2 Aug 2007 08:24:14 +0200 (MEST)
Date: Thu, 2 Aug 2007 08:24:13 +0200
From: Daniel Hartmeier <daniel@benzedrine.cx>
To: Patrick Proniewski <patpro@patpro.net>
Message-ID: <20070802062413.GB32306@insomnia.benzedrine.cx>
References: <DE71F511-8553-401A-A16C-DF4CAA5DA6E3@patpro.net>
	<611A93D3-A392-493B-80ED-4C5AC77AA77A@patpro.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <611A93D3-A392-493B-80ED-4C5AC77AA77A@patpro.net>
User-Agent: Mutt/1.5.12-2006-07-14
Cc: Greg Hennessy <Greg.Hennessy@nviz.net>, freebsd-pf@freebsd.org
Subject: Re: strange "throttling" issue with pf on xDSL connection
X-BeenThere: freebsd-pf@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Technical discussion and general questions about packet filter
	\(pf\)" <freebsd-pf.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-pf>,
	<mailto:freebsd-pf-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-pf>
List-Post: <mailto:freebsd-pf@freebsd.org>
List-Help: <mailto:freebsd-pf-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-pf>,
	<mailto:freebsd-pf-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 02 Aug 2007 06:24:15 -0000

On Wed, Aug 01, 2007 at 05:42:19PM +0200, Patrick Proniewski wrote:

> While playing around with systat I've discovered that the transfer  
> rate can be as low as 20 KB/s and as high as 850 KB/s on a single  
> download from http://test-debit.free.fr, but the mean value will  
> always be around 120-150 KB/s when pf is active. From one sample to  
> another (every second), the transfer rate is very erratic.
> If I disable pf on ext_if (set skip on $ext_if), the transfer rate  
> reaches quickly 850 KB/s and is almost stable. It decreases to  
> 400-450 KB/s for 1 or 2 seconds, 3 or 4 times per minute.

Enable pf debug logging (pfctl -xm), note output of pfctl -si, reproduce
the problem. Then run pfctl -si again. See /var/log/messages for lines
from pf. Post all three outputs ;)

Daniel