From owner-svn-src-head@FreeBSD.ORG Wed Aug 21 15:32:59 2013 Return-Path: Delivered-To: svn-src-head@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 F0CF61FB for ; Wed, 21 Aug 2013 15:32:59 +0000 (UTC) (envelope-from andre@freebsd.org) Received: from c00l3r.networx.ch (c00l3r.networx.ch [62.48.2.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 8A730248B for ; Wed, 21 Aug 2013 15:32:59 +0000 (UTC) Received: (qmail 72831 invoked from network); 21 Aug 2013 16:16:03 -0000 Received: from c00l3r.networx.ch (HELO [127.0.0.1]) ([62.48.2.2]) (envelope-sender ) by c00l3r.networx.ch (qmail-ldap-1.03) with SMTP for ; 21 Aug 2013 16:16:03 -0000 Message-ID: <5214DDA4.4010504@freebsd.org> Date: Wed, 21 Aug 2013 17:32:52 +0200 From: Andre Oppermann User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Peter Grehan Subject: Re: svn commit: r254520 - in head/sys: kern sys References: <201308191116.r7JBGsc6065793@svn.freebsd.org> <521256CE.6070706@FreeBSD.org> <5212870A.50105@freebsd.org> <521291F1.8060500@FreeBSD.org> <5214D5E0.9040002@freebsd.org> <5214D6CA.2040405@freebsd.org> In-Reply-To: <5214D6CA.2040405@freebsd.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Navdeep Parhar X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 15:33:00 -0000 On 21.08.2013 17:03, Peter Grehan wrote: >> The way to go should be 4K clusters as they are native to the architecture. >> IIRC a PCIe DMA can't cross a 4K boundary anyway > > That's a 4G boundary, for some devices. I meant a single PCIe DMA transaction can be at most 4K before it has to set up another one? -- Andre