From owner-freebsd-net@FreeBSD.ORG  Mon Oct  5 18:54:48 2009
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F0C341065692
	for <freebsd-net@freebsd.org>; Mon,  5 Oct 2009 18:54:48 +0000 (UTC)
	(envelope-from julian@elischer.org)
Received: from outC.internet-mail-service.net (outc.internet-mail-service.net
	[216.240.47.226])
	by mx1.freebsd.org (Postfix) with ESMTP id D328E8FC16
	for <freebsd-net@freebsd.org>; Mon,  5 Oct 2009 18:54:47 +0000 (UTC)
Received: from idiom.com (mx0.idiom.com [216.240.32.160])
	by out.internet-mail-service.net (Postfix) with ESMTP id E8C14B98E3;
	Mon,  5 Oct 2009 11:54:47 -0700 (PDT)
X-Client-Authorized: MaGic Cook1e
X-Client-Authorized: MaGic Cook1e
X-Client-Authorized: MaGic Cook1e
X-Client-Authorized: MaGic Cook1e
Received: from julian-mac.elischer.org (home.elischer.org [216.240.48.38])
	by idiom.com (Postfix) with ESMTP id 24DB72D6022;
	Mon,  5 Oct 2009 11:54:47 -0700 (PDT)
Message-ID: <4ACA40FA.7010207@elischer.org>
Date: Mon, 05 Oct 2009 11:54:50 -0700
From: Julian Elischer <julian@elischer.org>
User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812)
MIME-Version: 1.0
To: rihad <rihad@mail.ru>
References: <4AC8A76B.3050502@mail.ru>	<20091005025521.GA52702@svzserv.kemerovo.su>	<20091005061025.GB55845@onelab2.iet.unipi.it>	<4AC9B400.9020400@mail.ru>	<20091005090102.GA70430@svzserv.kemerovo.su>	<4AC9BC5A.50902@mail.ru>	<20091005095600.GA73335@svzserv.kemerovo.su>
	<20091005100446.GA60244@onelab2.iet.unipi.it>
	<4ACA26D4.2080102@elischer.org> <4ACA2BA6.40709@mail.ru>
	<4ACA335C.2060806@elischer.org> <4ACA34F3.60901@mail.ru>
In-Reply-To: <4ACA34F3.60901@mail.ru>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Eugene Grosbein <eugen@kuzbass.ru>, Luigi Rizzo <rizzo@iet.unipi.it>,
	freebsd-net@freebsd.org
Subject: Re: dummynet dropping too many packets
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: Mon, 05 Oct 2009 18:54:49 -0000

rihad wrote:
> Julian Elischer wrote:
>> rihad wrote:
>>> Julian Elischer wrote:
>>>> Luigi Rizzo wrote:
>>>>
>>>> Is it possible to know what sessions are losing packets?
>>>>
>>> Yes, of course, by running ipfw pipe show ;-)
>>> There's one confusing thing, though: net.inet.ip.dummynet.io_pkt_drop 
>>> isn't increasing while around 800-1000 packets per second are being 
>>> dropped right now. And so "ipfw pipe show" Drp column wouldn't grow 
>>> either. So it's either not dummynet dropping packets, or a bug (?).
>>
>>
>> I suspect your interface queues.
>>
> 
> You mean in hardware? Any way to tweak those?

no, there is (usually) a software queue before the hardware queue.

look at /sys/net/if_ethersubr.c