From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F691C55178 for ; Fri, 6 Nov 2020 21:33:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D59820735 for ; Fri, 6 Nov 2020 21:33:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728280AbgKFVc7 (ORCPT ); Fri, 6 Nov 2020 16:32:59 -0500 Received: from mail105.syd.optusnet.com.au ([211.29.132.249]:39787 "EHLO mail105.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728096AbgKFVc6 (ORCPT ); Fri, 6 Nov 2020 16:32:58 -0500 Received: from dread.disaster.area (pa49-179-6-140.pa.nsw.optusnet.com.au [49.179.6.140]) by mail105.syd.optusnet.com.au (Postfix) with ESMTPS id 5CA4F3AB09F; Sat, 7 Nov 2020 08:32:55 +1100 (AEDT) Received: from dave by dread.disaster.area with local (Exim 4.92.3) (envelope-from ) id 1kb9Lq-008Qc8-Dc; Sat, 07 Nov 2020 08:32:54 +1100 Date: Sat, 7 Nov 2020 08:32:54 +1100 From: Dave Chinner To: liang bai Cc: linux-xfs@vger.kernel.org Subject: Re: About material on old xfs wiki Message-ID: <20201106213254.GG7391@dread.disaster.area> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=Ubgvt5aN c=1 sm=1 tr=0 cx=a_idp_d a=uDU3YIYVKEaHT0eX+MXYOQ==:117 a=uDU3YIYVKEaHT0eX+MXYOQ==:17 a=kj9zAlcOel0A:10 a=nNwsprhYR40A:10 a=VwQbUJbxAAAA:8 a=7-415B0cAAAA:8 a=xDvEBrSEsUZi0YHBj7wA:9 a=CjuIK1q_8ugA:10 a=AjGcO6oz07-iQ99wixmX:22 a=biEYGPWJfzWAr4FL6Ov7:22 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Fri, Nov 06, 2020 at 04:14:05PM +0800, liang bai wrote: > Hi, > I am doing some research about how SSD can better cooperate with XFS. > So I need to know much about the design of the XFS. https://git.kernel.org/pub/scm/fs/xfs/xfs-documentation.git/ Though your best resource is going to be asking questions on this list. I'd be interested to know what sort of SSD optimisations you are thinking of, because largely SSD optimisations are similar to the layout optimisations that we do for RAID (alignment, cross-file packing, locality groupings, etc) and as such we don't actually have any specific SSD-only optimisations in XFS at all. Most of this knowledge isn't documented anywhere, so the only way you will understand what we already know works and doesn't work is to discuss the topic directly here on this list... Cheers, Dave. -- Dave Chinner david@fromorbit.com