From owner-freebsd-current@FreeBSD.ORG Wed Sep 2 15:28:25 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7008F106566C; Wed, 2 Sep 2009 15:28:25 +0000 (UTC) (envelope-from mel.flynn+fbsd.current@mailing.thruhere.net) Received: from mailhub.rachie.is-a-geek.net (rachie.is-a-geek.net [66.230.99.27]) by mx1.freebsd.org (Postfix) with ESMTP id 403E58FC12; Wed, 2 Sep 2009 15:28:25 +0000 (UTC) Received: from smoochies.rachie.is-a-geek.net (mailhub.rachie.is-a-geek.net [192.168.2.11]) by mailhub.rachie.is-a-geek.net (Postfix) with ESMTP id 052DC7E818; Wed, 2 Sep 2009 07:28:36 -0800 (AKDT) From: Mel Flynn To: freebsd-current@freebsd.org Date: Wed, 2 Sep 2009 17:28:21 +0200 User-Agent: KMail/1.11.4 (FreeBSD/8.0-BETA2; KDE/4.2.4; i386; ; ) References: <4A9E8677.1020208@FreeBSD.org> In-Reply-To: <4A9E8677.1020208@FreeBSD.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200909021728.21566.mel.flynn+fbsd.current@mailing.thruhere.net> Cc: Alexander Motin , "Derek \(freebsd lists\)" <482254ac@razorfever.net> Subject: MAXPHYS and physical memory (Was: Re: siis/atacam/ata/gmirror 8.0-BETA3 disk performance) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Sep 2009 15:28:25 -0000 On Wednesday 02 September 2009 16:51:35 Alexander Motin wrote: > For maximum linear I/O performance you may want to build kernel with > options MAXPHYS=(1024*1024) I've found that just doubling the default MAXPHYS already panics-on-boot a 1.5GB i386 system. Is there any reasonable conversion table for MAXPHYS to physical memory, since various memory related kernel setups are derived from or calculated with MAXPHYS? -- Mel