From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from frost.carfax.org.uk ([85.119.82.111]:32850 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756635AbdAJQKa (ORCPT ); Tue, 10 Jan 2017 11:10:30 -0500 Date: Tue, 10 Jan 2017 16:10:28 +0000 From: Hugo Mills To: "Austin S. Hemmelgarn" Cc: linux-btrfs@vger.kernel.org Subject: Re: mkfs.btrfs/balance small-btrfs chunk size RFC Message-ID: <20170110161028.GL19585@carfax.org.uk> References: <20170110152905.GJ19585@carfax.org.uk> <20170110154753.GK19585@carfax.org.uk> <46721c7c-2be2-28e8-c387-4d88b6d1a09d@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="ZPDwMsyfds7q4mrK" In-Reply-To: <46721c7c-2be2-28e8-c387-4d88b6d1a09d@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: --ZPDwMsyfds7q4mrK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jan 10, 2017 at 11:05:17AM -0500, Austin S. Hemmelgarn wrote: > On 2017-01-10 10:47, Hugo Mills wrote: > >On Tue, Jan 10, 2017 at 10:42:51AM -0500, Austin S. Hemmelgarn wrote: > >>Most of the issue in this case is with the size of the initial > >>chunk. That said, I've got quite a few reasonably sized filesystems > >>(I think the largest is 200GB) with moderate usage (max 90GB of > >>data), and none of them are using more than the first 16kB block in > >>the System chunk. While I'm not necessarily a typical user, I'd be > >>willing to bet based on this that in general, most people who aren't > >>storing very large amounts of data or taking huge numbers of > >>snapshots aren't going to need a system chunk much bigger than 1MB. > > > > Again, the system chunk has *nothing* to do with snapshots. > Apologies, I somehow completely missed the part of your first reply > where you commented on that... There was quite a lot of it. :) Hugo. -- Hugo Mills | Anyone who claims their cryptographic protocol is hugo@... carfax.org.uk | secure is either a genius or a fool. Given the http://carfax.org.uk/ | genius/fool ratio for our species, the odds aren't PGP: E2AB1DE4 | good. Bruce Schneier --ZPDwMsyfds7q4mrK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJYdQd0AAoJEFheFHXiqx3kR5QP/2X2+Jr++V43QFPEXayEJhna 2Iuo16UWwOWILLi7Ldb7FigNZUoOJ4eZvCKqEdyCdqm5zitCHPDbjLxnbxqFNCtO 7TQLJonUeklMJVadOcLjJ0Yci7++VLiQDez6GvhuoaQ+/1TcQlhBuC35fCty5uwV 2y5+8mQ2/L58SyWm8QPEtdoGZRhXKj7cU4oL9IA/nvdpguobu4x1TJ1s1y+Sc3t/ JrD+1YQ78teiLaOS7V4EZK63rIdv751db1R29dPdiqZim4Tg6rAy0L0cGXLHA1kA FetHQKndam7NTbxoM300Jgod0jA/s6BsGjyzDUP0/W0JUSFdOdm2BwLx9g0nRph3 RTPwW78X66XoWYq+6ETa8CufY/rFTr9wssVeuz7mcV7F8rT3Bj+nBg74hO0JOS30 1DvjDm2bCBodMCyr4MFtBilOM0s8cKs4oW3OkArNmI6lq5qJ/VnJluBeFxPKlRrr 9pLtqLn7fBii/aLyygKzMR1Fs9IPD+EhqInX23YtxrvdsjsRcKUtljsFY0B2O7o6 0hm45F7ZchSkt5wfEe4e1n+ay5hEdbnYyclIdUGsJyBGfUl/k9a6Ye+Gafiu7O9l R1BEB6bU00KwJWNgrr/tyxOU07hNCghu+1ZhnG7hOFjUhxnvYe+a+oswpz6jQS0B 0Cqb66N5I7ZiLVlUn5Qa =XVCT -----END PGP SIGNATURE----- --ZPDwMsyfds7q4mrK--