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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1BE1C6FD19 for ; Fri, 10 Mar 2023 08:43:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231345AbjCJInj (ORCPT ); Fri, 10 Mar 2023 03:43:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230400AbjCJInF (ORCPT ); Fri, 10 Mar 2023 03:43:05 -0500 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6A0FDB4BC for ; Fri, 10 Mar 2023 00:41:09 -0800 (PST) Received: by verein.lst.de (Postfix, from userid 2407) id 5B6BC6732D; Fri, 10 Mar 2023 09:41:06 +0100 (CET) Date: Fri, 10 Mar 2023 09:41:06 +0100 From: Christoph Hellwig To: Qu Wenruo Cc: Christoph Hellwig , Chris Mason , Josef Bacik , David Sterba , linux-btrfs@vger.kernel.org Subject: Re: [PATCH 12/20] btrfs: simplify extent buffer writing Message-ID: <20230310084106.GA16264@lst.de> References: <20230309090526.332550-1-hch@lst.de> <20230309090526.332550-13-hch@lst.de> <1ec86c37-b5d9-639e-fb9a-f78088164b9f@gmx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1ec86c37-b5d9-639e-fb9a-f78088164b9f@gmx.com> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Fri, Mar 10, 2023 at 04:34:10PM +0800, Qu Wenruo wrote: > Does this also mean, the only benefit of manually merging continuous pages > into a larger bio, compared to multiple smaller adjacent bios, is just > memory saving? That is the only significant saving. There also is a very minimal amount of CPU cycles saved as well.