From owner-freebsd-fs@FreeBSD.ORG Wed May 23 09:04:46 2007 Return-Path: X-Original-To: freebsd-fs@freebsd.org Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 0C7CD16A400; Wed, 23 May 2007 09:04:46 +0000 (UTC) (envelope-from roberto@keltia.freenix.fr) Received: from keltia.freenix.fr (keltia.freenix.org [82.230.37.243]) by mx1.freebsd.org (Postfix) with ESMTP id B513013C44B; Wed, 23 May 2007 09:04:45 +0000 (UTC) (envelope-from roberto@keltia.freenix.fr) Received: from localhost (localhost [127.0.0.1]) by keltia.freenix.fr (Postfix/TLS) with ESMTP id 2213F396E2; Wed, 23 May 2007 11:04:44 +0200 (CEST) Received: from keltia.freenix.fr ([127.0.0.1]) by localhost (keltia.freenix.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 97122-05; Wed, 23 May 2007 11:04:43 +0200 (CEST) Received: by keltia.freenix.fr (Postfix/TLS, from userid 101) id B382E396DB; Wed, 23 May 2007 11:04:43 +0200 (CEST) Date: Wed, 23 May 2007 11:04:43 +0200 From: Ollivier Robert To: freebsd-current@freebsd.org, freebsd-fs@freebsd.org, Kris Kennaway Message-ID: <20070523090443.GA97506@keltia.freenix.fr> References: <20070407212413.GK8831@cicely12.cicely.de> <20070410003505.GA8189@nowhere> <20070410003837.GB8189@nowhere> <20070410011125.GB38535@xor.obsecurity.org> <20070410013034.GC8189@nowhere> <20070410014233.GD8189@nowhere> <4651BD6F.5050301@unsane.co.uk> <20070522083112.GA5136@hub.freebsd.org> <4652B15D.5060505@unsane.co.uk> <20070523085532.GA27542@hub.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070523085532.GA27542@hub.freebsd.org> X-Operating-System: MacOS X / Macbook Pro - FreeBSD 6.2 / Dell D820 SMP User-Agent: Mutt/1.5.15 (2007-04-06) X-Virus-Scanned: amavisd-new at keltia.freenix.fr Cc: Subject: Re: ZFS committed to the FreeBSD base. X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 May 2007 09:04:46 -0000 According to Darren Reed: > It's not RAM that ZFS really likes but your KVA (Kernel Virtual Address) > space. With a 32bit kernel you are more likely to experience problems > with KVA shortage than you are RAM shortage when using ZFS. It was discussed a bit at the DevSummit in BSDCan and an interesting question was raised. ZFS has its own buffer cache and tries as best as it can to bypass our own, taking its toll on memory and KVA. I don't think we could replace our buffer cache with ARC due to the license but it would be nice to reduce the duplication there. -- Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr Darwin sidhe.keltia.net Kernel Version 8.9.1: Thu Feb 22 20:55:00 PST 2007 i386