From owner-freebsd-fs@FreeBSD.ORG Tue Nov 24 14:24:36 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E1CD7106566B for ; Tue, 24 Nov 2009 14:24:36 +0000 (UTC) (envelope-from roberto@keltia.freenix.fr) Received: from keltia.freenix.fr (keltia.freenix.org [IPv6:2001:660:330f:f820:213:72ff:fe15:f44]) by mx1.freebsd.org (Postfix) with ESMTP id 7F9418FC0C for ; Tue, 24 Nov 2009 14:24:36 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by keltia.freenix.fr (Postfix/TLS) with ESMTP id 694D739AE2 for ; Tue, 24 Nov 2009 15:24:35 +0100 (CET) X-Virus-Scanned: amavisd-new at keltia.freenix.fr 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 RTh+xlthdiBv for ; Tue, 24 Nov 2009 15:24:35 +0100 (CET) Received: from roberto-al.eurocontrol.fr (aran.keltia.net [88.191.250.24]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: roberto) by keltia.freenix.fr (Postfix/TLS) with ESMTPSA id DAD4839A2B for ; Tue, 24 Nov 2009 15:24:34 +0100 (CET) Date: Tue, 24 Nov 2009 15:24:07 +0100 From: Ollivier Robert To: freebsd-fs@freebsd.org Message-ID: <20091124142407.GD81894@roberto-al.eurocontrol.fr> References: <20091122154228.GB55532@rron.freenix.org> <4B0BD5E7.3050604@freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <4B0BD5E7.3050604@freebsd.org> X-Operating-System: MacOS X / Macbook Pro - FreeBSD 7.2 / Dell D820 SMP User-Agent: Mutt/1.5.20 (2009-06-14) Subject: Re: 7.2 dies in zfs 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: Tue, 24 Nov 2009 14:24:37 -0000 According to Stefan Esser: >If your i386 based system has much RAM (2GB or more), than you >should definitely increase KVA_PAGES. Not doing so will lead to >panics, not in spite of but exactly because of the large RAM. I have uppped KVA_PAGES of course but this is reducing the amount of memory available to processes. If you define KVA_PAGES to 2GB for example, every process will be able to use only the remaining 2 GB for their own memory so there is a trade off there. >I have been using ZFS on i386 since it became available, first for >testing and soon as only file-system (with UFS boot, initially, now >switching over to gptzfsboot). Systems range from Pentium-3 to >AMD64x2 and I see no problems even under significant load. I've found that load is not a factor (if one defines load as many concurrent processes). The machine is mostly idle and I've seen panics coming from a "cvs update" or a "svn up". There are I/O intensive but not that much whereas the same machine can survive a buildworld just fine. The machine I have is a dual Xeon @2.8 GHz with 4 GB of RAM and 200 GB of disk. /boot/loader.conf ----- #-- limits kern.maxdsiz="1024M" kern.maxssiz="256M" kern.dfldsiz="1024M" kern.dflssiz="128M" #-- vm tuning vm.kmem_size="1024M" vm.kmem_size_max="1224M" vfs.zfs.arc_max="128M" vfs.zfs.prefetch_disable=1 ----- options KVA_PAGES=384 # 1.5GB of KVA -- Ollivier ROBERT -=- FreeBSD: The Power to Serve! -=- roberto@keltia.freenix.fr In memoriam to Ondine : http://ondine.keltia.net/