From owner-freebsd-arch@freebsd.org Sat Jan 18 01:16:15 2020 Return-Path: Delivered-To: freebsd-arch@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 97083221742 for ; Sat, 18 Jan 2020 01:16:15 +0000 (UTC) (envelope-from mike@karels.net) Received: from mail.karels.net (mail.karels.net [216.160.39.52]) by mx1.freebsd.org (Postfix) with ESMTP id 4800PT51xzz4Lfy; Sat, 18 Jan 2020 01:16:13 +0000 (UTC) (envelope-from mike@karels.net) Received: from mail.karels.net (localhost [127.0.0.1]) by mail.karels.net (8.15.2/8.15.2) with ESMTP id 00I1G705020955; Fri, 17 Jan 2020 19:16:07 -0600 (CST) (envelope-from mike@karels.net) Message-Id: <202001180116.00I1G705020955@mail.karels.net> To: Ben Woods cc: Philip Paeps , freebsd-arch@freebsd.org, Conrad Meyer , Ed Maste , Ben Woods From: Mike Karels Reply-to: mike@karels.net Subject: Re: svn commit: r356758 - in head/usr.sbin/bsdinstall: . scripts In-reply-to: Your message of Fri, 17 Jan 2020 17:14:54 +1000. MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <20953.1579310167.1@mail.karels.net> Date: Fri, 17 Jan 2020 19:16:07 -0600 X-Rspamd-Queue-Id: 4800PT51xzz4Lfy X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of mike@karels.net designates 216.160.39.52 as permitted sender) smtp.mailfrom=mike@karels.net X-Spamd-Result: default: False [-4.40 / 15.00]; ARC_NA(0.00)[]; HAS_REPLYTO(0.00)[mike@karels.net]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:216.160.39.52]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[karels.net]; REPLYTO_ADDR_EQ_FROM(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; TO_MATCH_ENVRCPT_SOME(0.00)[]; IP_SCORE(-2.20)[ip: (-7.24), ipnet: 216.160.0.0/15(-3.64), asn: 209(-0.08), country: US(-0.05)]; FREEMAIL_TO(0.00)[gmail.com]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:209, ipnet:216.160.0.0/15, country:US]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Jan 2020 01:16:15 -0000 > On Fri, 17 Jan 2020 at 08:21, Ben Woods wrote: > > Perhaps we could simply include a message on that bsdinstall partitioning > > mode selection screen that UFS is recommended on systems with < 4 Gb RAM? > > > I have uploaded a diff for this here: https://reviews.freebsd.org/D23224 > Please let me know your thoughts (comments in the phabricator review would > be best). I think this needs more discussion, preferably on this list. I am not convinced that systems with as little as 4 GB should use ZFS. Conventional wisdom on the FreeNAS mailing list says that 8 GB is required for ZFS, and FreeNAS no longer includes UFS as an option. Conrad suggested a cutoff of 16 GB; I am happier with 16 GB than 4 GB as a cutoff. Also, there was mention of auto-tuning for smaller systems; I don't think that has materialized yet. I'm not sure how plausible that is without knowing the workload. I use ZFS on a workstation/server with 64 GB that runs 4 bhyve guests that do things like buildworld. ZFS wants 63 GB for arc_max; needless to say, I have a tunable set to a much lower value. If tuning is required, it is unclear that ZFS is a good default. Mike