From owner-freebsd-xen@FreeBSD.ORG Fri Mar 4 17:41:36 2011 Return-Path: Delivered-To: freebsd-xen@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 722621065670 for ; Fri, 4 Mar 2011 17:41:36 +0000 (UTC) (envelope-from simond@irrelevant.org) Received: from mail-gw0-f44.google.com (mail-gw0-f44.google.com [74.125.83.44]) by mx1.freebsd.org (Postfix) with ESMTP id 2B6AE8FC16 for ; Fri, 4 Mar 2011 17:41:35 +0000 (UTC) Received: by gwaa18 with SMTP id a18so1966302gwa.17 for ; Fri, 04 Mar 2011 09:41:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=irrelevant.org; s=irrelevant; h=domainkey-signature:mime-version:x-originating-ip:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=rNwrq9yWHOEFlv1MxIikOjNLFuKAN7MxwHNcx2G3QDM=; b=HSmjDeuGrQ1e2HcY+SV7j4XGgdusZ65u41zUg+7/cW3mLiadgNQGhvkJ8fz33s5mK1 n1Du/r8IYzPZyGIGCVlmnyn+sttEoRSgPtOP4qe6FfGErLlv0C33h4BDUFlvHTINmglP bl/y8ybjDkj4ISy+U56R3FXZJ2U5S9v9YEpQs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=irrelevant.org; s=irrelevant; h=mime-version:x-originating-ip:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=GXZ4RiEcylTFFV4gc1k3BgdAspXKtSoYtzghvjAhFNEo7KvUVmvZGt3e2r84zuJe3n 1xNb6brjNHfNI/771qldW4779v8gBzJTiyqX/iytJhYWcSG5OSamLk9gjx/Saw0bjZoq 1N7lLwn6yKVDe5eIJjfcN3MbnHYlqlq5pFyBc= MIME-Version: 1.0 Received: by 10.90.250.25 with SMTP id x25mr1037913agh.197.1299258727206; Fri, 04 Mar 2011 09:12:07 -0800 (PST) Received: by 10.91.111.2 with HTTP; Fri, 4 Mar 2011 09:12:07 -0800 (PST) X-Originating-IP: [188.223.83.48] In-Reply-To: <423DA028-1CDB-443F-B3F0-C610D6268484@tao.org.uk> References: <423DA028-1CDB-443F-B3F0-C610D6268484@tao.org.uk> Date: Fri, 4 Mar 2011 17:12:07 +0000 Message-ID: From: Simon Dick To: Dr Josef Karthauser Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-xen@freebsd.org Subject: Re: XEN i386 with PAE and zfs, trouble? X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Mar 2011 17:41:36 -0000 On 4 March 2011 14:11, Dr Josef Karthauser wrote: > Hey there, > > I've been asking these questions to the wrong list! Just found the xen li= st, so I'll recap here. > > I want to run amd64 on xen, at a VPS hosting provider. Due to cost constr= aints the sweet spot in the cost/memory ratio has given me a provider who w= ill only support a "ops_pv" kernel. This means that XENHVM on amd64 is not = available to me. > > The VPS provider will be giving me at least 6 gb of ram, and I want to ru= n ZFS on the instance. This leaves me considering running the i386 kernel a= nd relying on PAE to get access to the extra memory. I presume that I'll lo= se about 1.5-2gb of RAM to ZFS tuning, and hope that means that I'll have 4= gb(-ish) available to userland processes. > > Is this a sensible assumption? Can I rely on this being a stable configur= ation, or am I high?! :) Not sure if it's just me, but you lose a fair few of ZFSs features if you're not running it on actual hardware drives, etc, though I think what you're planning may work it's not a setup I'd like to run myself apart from to experiment with :)