From owner-freebsd-net@FreeBSD.ORG  Fri Aug 31 08:10:52 2012
Return-Path: <owner-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 78630106566B
	for <freebsd-net@freebsd.org>; Fri, 31 Aug 2012 08:10:52 +0000 (UTC)
	(envelope-from lev@FreeBSD.org)
Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru
	[46.4.40.135]) by mx1.freebsd.org (Postfix) with ESMTP id 2D7558FC0C
	for <freebsd-net@freebsd.org>; Fri, 31 Aug 2012 08:10:51 +0000 (UTC)
Received: from lion.home.serebryakov.spb.ru (unknown
	[IPv6:2001:470:923f:1:49ee:4a:4b3c:6f58])
	(Authenticated sender: lev@serebryakov.spb.ru)
	by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPA id D752F4AC2D; 
	Fri, 31 Aug 2012 12:10:47 +0400 (MSK)
Date: Fri, 31 Aug 2012 12:10:43 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
X-Priority: 3 (Normal)
Message-ID: <643110717.20120831121043@serebryakov.spb.ru>
To: Adam Vande More <amvandemore@gmail.com>
In-Reply-To: <CA+tpaK1P6Y-8tDYrP+4ca3FG_QwHjPpoZNzUQBCZFjf1LbyEZg@mail.gmail.com>
References: <1865271844.20120829131610@serebryakov.spb.ru>
	<CAHu1Y70MynCMQTrJUMwTZ0+LrM1JiZFt_B77028XHfoiRgzmaA@mail.gmail.com>
	<1807373989.20120829223125@serebryakov.spb.ru>
	<20120830152726.A33776@sola.nimnet.asn.au>
	<534292400.20120830131158@serebryakov.spb.ru>
	<CA+tpaK1P6Y-8tDYrP+4ca3FG_QwHjPpoZNzUQBCZFjf1LbyEZg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=koi8-r
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-net@freebsd.org, Ian Smith <smithi@nimnet.asn.au>
Subject: Re: Bad routing performance on 500Mhz Geode LX with CURRENT,
	ipfw and mpd5 (was: ipfw,
	"ip|all" proto and PPPoE -- does PPPoE packets passed to ipfw?)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: lev@FreeBSD.org
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: Fri, 31 Aug 2012 08:10:52 -0000

Hello, Adam.
You wrote 31 =C1=D7=C7=D5=D3=D4=C1 2012 =C7., 0:32:25:

AVM> BUGS
AVM>      The vr driver always copies transmit mbuf chains into longword-al=
igned
AVM>      buffers prior to transmission in order to pacify the Rhine chips.=
  If
AVM>      buffers are not aligned correctly, the chip will round the suppli=
ed
AVM>      buffer address and begin DMAing from the wrong location.  This bu=
ffer
AVM>      copying impairs transmit performance on slower systems but cannot=
 be
AVM>      avoided.  On faster machines (e.g. a Pentium II), the performance
AVM> impact
AVM>      is much less noticeable.
 Really, this is not truth. Or, to be more specific, it is not
 complete truth. Now if_vr copies data only for some chips (quirk
 VR_Q_NEEDALIGN in sources). My chips (VT6105M) don't need it, and
 driver doesn't copy data for them.

--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>