From owner-freebsd-arch@FreeBSD.ORG Mon Mar 22 11:40:22 2010 Return-Path: Delivered-To: freebsd-arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 67F76106566B; Mon, 22 Mar 2010 11:40:22 +0000 (UTC) (envelope-from gary.jennejohn@freenet.de) Received: from mout3.freenet.de (mout3.freenet.de [IPv6:2001:748:100:40::2:5]) by mx1.freebsd.org (Postfix) with ESMTP id F05B68FC1C; Mon, 22 Mar 2010 11:40:21 +0000 (UTC) Received: from [195.4.92.23] (helo=13.mx.freenet.de) by mout3.freenet.de with esmtpa (ID gary.jennejohn@freenet.de) (port 25) (Exim 4.72 #2) id 1NtfzY-00006b-7Q; Mon, 22 Mar 2010 12:40:20 +0100 Received: from p57ae04cc.dip0.t-ipconnect.de ([87.174.4.204]:10019 helo=ernst.jennejohn.org) by 13.mx.freenet.de with esmtpa (ID gary.jennejohn@freenet.de) (port 25) (Exim 4.72 #2) id 1NtfzY-0005Bb-0v; Mon, 22 Mar 2010 12:40:20 +0100 Date: Mon, 22 Mar 2010 12:40:18 +0100 From: Gary Jennejohn To: Alexander Motin Message-ID: <20100322124018.7430f45e@ernst.jennejohn.org> In-Reply-To: <4BA6517C.3050509@FreeBSD.org> References: <4BA4E7A9.3070502@FreeBSD.org> <201003201753.o2KHrH5x003946@apollo.backplane.com> <891E2580-8DE3-4B82-81C4-F2C07735A854@samsco.org> <4BA52179.9030903@FreeBSD.org> <39C5864C-8A6B-4137-8743-D7B9F30F5939@samsco.org> <4BA6517C.3050509@FreeBSD.org> X-Mailer: Claws Mail 3.7.5 (GTK+ 2.18.7; amd64-portbld-freebsd9.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Scott Long , FreeBSD-Current , freebsd-arch@freebsd.org Subject: Re: Increasing MAXPHYS X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: gary.jennejohn@freenet.de List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Mar 2010 11:40:22 -0000 On Sun, 21 Mar 2010 19:03:56 +0200 Alexander Motin wrote: > Scott Long wrote: > > Are there non-CAM drivers that look at MAXPHYS, or that silently assume that > > MAXPHYS will never be more than 128k? > > That is a question. > I only did a quick&dirty grep looking for MAXPHYS in /sys. Some drivers redefine MAXPHYS to be 512KiB. Some use their own local MAXPHYS which is usually 128KiB. Some look at MAXPHYS to figure out other things; the details escape me. There's one driver which actually uses 100*MAXPHYS for something, but I didn't check the details. Lots of them were non-CAM drivers AFAICT. -- Gary Jennejohn