From owner-svn-src-all@FreeBSD.ORG Tue Feb 24 20:01:44 2015 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 717ADE17 for ; Tue, 24 Feb 2015 20:01:44 +0000 (UTC) Received: from mo6-p00-ob.smtp.rzone.de (mo6-p00-ob.smtp.rzone.de [IPv6:2a01:238:20a:202:5300::7]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.smtp.rzone.de", Issuer "TeleSec ServerPass DE-2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0D738EAD for ; Tue, 24 Feb 2015 20:01:43 +0000 (UTC) X-RZG-AUTH: :JiIXek6mfvEEUpFQdo7Fj1/zg48CFjWjQv0cW+St/nW/avgusCdtw9+43oQGYIsZZxQQ0xcmsA== X-RZG-CLASS-ID: mo00 Received: from britannica.bec.de (cl-3506.cgn-01.de.sixxs.net [IPv6:2001:4dd0:ff00:db1::2]) by smtp.strato.de (RZmta 37.3 AUTH) with ESMTPSA id k003abr1OK11Ae0 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) for ; Tue, 24 Feb 2015 21:01:01 +0100 (CET) Received: by britannica.bec.de (sSMTP sendmail emulation); Tue, 24 Feb 2015 21:01:00 +0100 Date: Tue, 24 Feb 2015 21:01:00 +0100 From: Joerg Sonnenberger To: svn-src-all@freebsd.org Subject: Re: svn commit: r279236 - head/sys/netinet Message-ID: <20150224200100.GA1217@britannica.bec.de> References: <201502241257.t1OCv40V097418@svn.freebsd.org> <20150224173413.GF46794@funkthat.com> <1424804342.3293.9.camel@freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1424804342.3293.9.camel@freebsd.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Feb 2015 20:01:44 -0000 On Tue, Feb 24, 2015 at 11:59:02AM -0700, Ian Lepore wrote: > ETHER_ALIGN is wonderful... if you're on a platform that can DMA to an > arbitrary boundary. Isn't it generally more a case of "if the device's DMA engine isn't extremely bad designed"? There is a strong correlation between devices not supporting DMA to arbitrary locations and devices requiring a single data segment. Heck, from a design point of few there is no justification for not supporting skipping a few byte at the start of the receive. The device can easily just add two bytes of noise to make it double word aligned if necessary... VIA Rhine forever! Joerg