From owner-freebsd-arch@FreeBSD.ORG Tue Jul 7 18:25:49 2009 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 BAEFC1065672 for ; Tue, 7 Jul 2009 18:25:49 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from cmail.optima.ua (cmail.optima.ua [195.248.191.121]) by mx1.freebsd.org (Postfix) with ESMTP id 3B55E8FC15 for ; Tue, 7 Jul 2009 18:25:48 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from [212.86.226.226] (account mav@alkar.net HELO mavbook.mavhome.dp.ua) by cmail.optima.ua (CommuniGate Pro SMTP 5.2.9) with ESMTPSA id 247938962; Tue, 07 Jul 2009 21:25:46 +0300 Message-ID: <4A53931D.6040307@FreeBSD.org> Date: Tue, 07 Jul 2009 21:25:33 +0300 From: Alexander Motin User-Agent: Thunderbird 2.0.0.21 (X11/20090405) MIME-Version: 1.0 To: Matthew Dillon References: <1246746182.00135530.1246735202@10.7.7.3> <1246792983.00135712.1246781401@10.7.7.3> <1246796580.00135722.1246783203@10.7.7.3> <1246814582.00135806.1246803602@10.7.7.3> <1246818181.00135809.1246804804@10.7.7.3> <1246825383.00135846.1246812602@10.7.7.3> <1246825385.00135854.1246814404@10.7.7.3> <1246830930.00135868.1246819202@10.7.7.3> <1246830933.00135875.1246820402@10.7.7.3> <1246908182.00136258.1246896003@10.7.7.3> <1246911786.00136277.1246900203@10.7.7.3> <1246915383.00136290.1246904409@10.7.7.3> <4A534D05.1040709@FreeBSD.org> <200907071636.n67GagxN087660@apollo.backplane.com> In-Reply-To: <200907071636.n67GagxN087660@apollo.backplane.com> Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-arch@FreeBSD.org Subject: Re: DFLTPHYS vs MAXPHYS X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Jul 2009 18:25:50 -0000 Matthew Dillon wrote: > That isn't correct. Locality of reference for adjacent data is very > important even if the filesystem only needs a small amount of data. All I wanted to say, is that it is FS privilege to decide how much data it needs. But when it really needs a lot of data, they should be better transferred with smaller number of bigger transactions, without strict MAXPHYS limitation. -- Alexander Motin