From owner-freebsd-virtualization@freebsd.org Thu Aug 27 06:20:15 2015 Return-Path: Delivered-To: freebsd-virtualization@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D0A859C2C7B for ; Thu, 27 Aug 2015 06:20:15 +0000 (UTC) (envelope-from marcus@odin.blazingdot.com) Received: from odin.blazingdot.com (odin.blazingdot.com [204.109.60.170]) by mx1.freebsd.org (Postfix) with ESMTP id B99F6143 for ; Thu, 27 Aug 2015 06:20:15 +0000 (UTC) (envelope-from marcus@odin.blazingdot.com) Received: by odin.blazingdot.com (Postfix, from userid 1001) id 6ED251324B2; Wed, 26 Aug 2015 23:20:15 -0700 (PDT) Date: Wed, 26 Aug 2015 23:20:15 -0700 From: Marcus Reid To: Vick Khera Cc: freebsd-virtualization@freebsd.org Subject: Re: Options for zfs inside a VM backed by zfs on the host Message-ID: <20150827062015.GA10272@blazingdot.com> References: <20150827061044.GA10221@blazingdot.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150827061044.GA10221@blazingdot.com> X-Coffee-Level: nearly-fatal User-Agent: Mutt/1.5.23 (2014-03-12) X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Aug 2015 06:20:15 -0000 On Wed, Aug 26, 2015 at 11:10:44PM -0700, Marcus Reid wrote: > On Wed, Aug 26, 2015 at 05:25:52PM -0400, Vick Khera wrote: > > Opinions? Preferably well-reasoned ones. :) > > However, having the ARC eating up lots of memory twice seems pretty > bletcherous. You can probably do some tuning to reduce that, but I > never liked tuning the ARC much. I just realized that you can turn primarycache off per-dataset. Does it make more sense to turn primarycache=none on the zvol on the host, or on the datasets in the vm? I'm thinking on the host, but it might be worth experimenting. Marcus