From owner-svn-src-all@FreeBSD.ORG Sun Dec 6 11:53:13 2009 Return-Path: Delivered-To: svn-src-all@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5B60B106566B; Sun, 6 Dec 2009 11:53:13 +0000 (UTC) (envelope-from rdivacky@vlk.vlakno.cz) Received: from vlakno.cz (77-93-215-190.static.masterinter.net [77.93.215.190]) by mx1.freebsd.org (Postfix) with ESMTP id 576D48FC12; Sun, 6 Dec 2009 11:53:12 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by vlakno.cz (Postfix) with ESMTP id F1AC19CB0E4; Sun, 6 Dec 2009 12:51:21 +0100 (CET) X-Virus-Scanned: amavisd-new at vlakno.cz Received: from vlakno.cz ([127.0.0.1]) by localhost (lev.vlakno.cz [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jrr47tWzuLyh; Sun, 6 Dec 2009 12:51:19 +0100 (CET) Received: from vlk.vlakno.cz (localhost [127.0.0.1]) by vlakno.cz (Postfix) with ESMTP id 9786F9CB0FF; Sun, 6 Dec 2009 12:51:19 +0100 (CET) Received: (from rdivacky@localhost) by vlk.vlakno.cz (8.14.3/8.14.3/Submit) id nB6BpJuw028332; Sun, 6 Dec 2009 12:51:19 +0100 (CET) (envelope-from rdivacky) Date: Sun, 6 Dec 2009 12:51:19 +0100 From: Roman Divacky To: Alexander Motin Message-ID: <20091206115119.GA25721@freebsd.org> References: <200912060010.nB60AD12004058@svn.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200912060010.nB60AD12004058@svn.freebsd.org> User-Agent: Mutt/1.4.2.3i Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r200171 - in head: sbin/atacontrol sys/arm/mv sys/cam/ata sys/cam/scsi sys/conf sys/dev/ata sys/dev/ata/chipsets sys/powerpc/powermac sys/powerpc/psim X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 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: Sun, 06 Dec 2009 11:53:13 -0000 On Sun, Dec 06, 2009 at 12:10:13AM +0000, Alexander Motin wrote: > Author: mav > Date: Sun Dec 6 00:10:13 2009 > New Revision: 200171 > URL: http://svn.freebsd.org/changeset/base/200171 > > Log: > MFp4: > Introduce ATA_CAM kernel option, turning ata(4) controller drivers into > cam(4) interface modules. When enabled, this options deprecates all ata(4) > peripheral drivers (ad, acd, ...) and interfaces and allows cam(4) drivers > (ada, cd, ...) and interfaces to be natively used instead. > > As side effect of this, ata(4) mode setting code was completely rewritten > to make controller API more strict and permit above change. While doing > this, SATA revision was separated from PATA mode. It allows DMA-incapable > SATA devices to operate and makes hw.ata.atapi_dma tunable work again. > > Also allow ata(4) controller drivers (except some specific or broken ones) > to handle larger data transfers. Previous constraint of 64K was artificial > and is not really required by PCI ATA BM specification or hardware. are there any performance benefits of the 64K limit removal?