From owner-freebsd-net@FreeBSD.ORG  Wed Oct 30 21:53:24 2013
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id B686E212;
 Wed, 30 Oct 2013 21:53:24 +0000 (UTC)
 (envelope-from adrian.chadd@gmail.com)
Received: from mail-qa0-x22e.google.com (mail-qa0-x22e.google.com
 [IPv6:2607:f8b0:400d:c00::22e])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 530B026B2;
 Wed, 30 Oct 2013 21:53:24 +0000 (UTC)
Received: by mail-qa0-f46.google.com with SMTP id j15so4105948qaq.12
 for <multiple recipients>; Wed, 30 Oct 2013 14:53:23 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:in-reply-to:references:date:message-id:subject
 :from:to:cc:content-type;
 bh=YbkY7Urr5B8bLFKIzNB0U8SrzTyjLAS2IhuUCMcPyuw=;
 b=fh3YpF9i/4PgegyNcJ/PjigtGunCGuGNKErshEhm3k6JQQdWbrqvZVPZsHgBdax97q
 Dc/4C6CENlZgyZOhx12ETqBKcemGVQZAdQNKC+f4GoAp7JCuvCD8bwFBeKRbLJSY/eiR
 Ii/hZtnzfJtfz2CGQmAwLiHwLNZLMi9aCKkA0LwQ2ojmCUxM8tmbBb3Ork+xPgcWAte4
 UGVGlKRtvj8yJcEfsvmMp6zcQo/uSkvLD7bBHA0KEihjmgZ3ItlhCYXFr8SRu41F+KX5
 CzwX5PBd4pCirRfeRlRgOABBjHIc4obm12qCSUE4kDhOBa5sd2FTm1EymhFGDFLcaKEk
 TG8g==
MIME-Version: 1.0
X-Received: by 10.224.113.199 with SMTP id b7mr980525qaq.4.1383170003477; Wed,
 30 Oct 2013 14:53:23 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.224.207.66 with HTTP; Wed, 30 Oct 2013 14:53:23 -0700 (PDT)
In-Reply-To: <52717A62.7040600@freebsd.org>
References: <40948D79-E890-4360-A3F2-BEC34A389C7E@lakerest.net>
 <526FFED9.1070704@freebsd.org>
 <CA+hQ2+gTc87M0f5pvFeW_GCZDogrLkT_1S2bKHngNcDEBUeZYQ@mail.gmail.com>
 <52701D8B.8050907@freebsd.org> <527022AC.4030502@FreeBSD.org>
 <527027CE.5040806@freebsd.org> <5270309E.5090403@FreeBSD.org>
 <5270462B.8050305@freebsd.org>
 <CAJ-Vmo=6thETmTDrPYRjwNTEQaTWkSTKdRYN3eRw5xVhsvr5RQ@mail.gmail.com>
 <20131030050056.GA84368@onelab2.iet.unipi.it>
 <52717A62.7040600@freebsd.org>
Date: Wed, 30 Oct 2013 14:53:23 -0700
X-Google-Sender-Auth: E1dx_NzsQWZ0OYjPA511t5MA6GI
Message-ID: <CAJ-VmonUiBw+_auJEz254Gsyu9yq2awoFKyKDM9S4iY5S8BiOA@mail.gmail.com>
Subject: Re: [long] Network stack -> NIC flow (was Re: MQ Patch.)
From: Adrian Chadd <adrian@freebsd.org>
To: Andre Oppermann <andre@freebsd.org>
Content-Type: text/plain; charset=ISO-8859-1
Cc: "freebsd-net@freebsd.org" <net@freebsd.org>,
 Luigi Rizzo <rizzo@iet.unipi.it>, Navdeep Parhar <np@freebsd.org>,
 Randall Stewart <rrs@lakerest.net>
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/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: Wed, 30 Oct 2013 21:53:24 -0000

On 30 October 2013 14:30, Andre Oppermann <andre@freebsd.org> wrote:

> As default setup and when running a server no QoS will be active
> or inserted.  No or only very small software queues exist to handle
> concurrency (except for ieee80211 to do sophisticated frame management
> inside *if_txframe).  Whenever the DMA ring is full there is no point
> in queuing up more packets.  Instead the socket buffers act as buffers
> and also ensure flow control and backpressure up to userspace to limit
> kernel memory usage from double and triple buffering.

.. and what about for LAN<->WAN traffic, where there's no socket buffers?



-adrian