From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Is font fallback slow over X11/ssh? Date: Thu, 04 Jun 2020 17:01:37 -0400 Message-ID: References: <5zc62183.dag@gnui.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="115061"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Dmitry Alexandrov To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:iGCX3heYlTv5lctK20CvzH3JsCw= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jun 04 23:02:24 2020 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jgx0K-000Too-PX for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 04 Jun 2020 23:02:24 +0200 Original-Received: from localhost ([::1]:58248 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jgx0J-0002F9-Rz for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 04 Jun 2020 17:02:23 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52938) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jgwzo-0002Ex-E5 for help-gnu-emacs@gnu.org; Thu, 04 Jun 2020 17:01:52 -0400 Original-Received: from ciao.gmane.io ([159.69.161.202]:58370) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jgwzn-0005HK-B0 for help-gnu-emacs@gnu.org; Thu, 04 Jun 2020 17:01:52 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1jgwzk-000T4H-Kg for help-gnu-emacs@gnu.org; Thu, 04 Jun 2020 23:01:48 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=159.69.161.202; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/04 17:01:48 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:123228 Archived-At: >>>> Is font fallback slow over X11/ssh? >>> FWIW, yes, it is. And thatʼs one of my reasons to prefer >>> server-side font rendering for remote Emacs sessions. >>> I. e. something like: >>> $ emacs --xrm='Emacs.fontBackend: x' >> Interesting. Do you have some explanation for why you find it more useful for remote sessions? > No, in the sense that @yuri.v.khan@gmail.comʼs one is more thorough than mine. My question was based on my foggy memory that back when client-side fonts (xft) were introduced to the wonderful X11 world, there was some article that came out explaining that while it requires sending the bitmap of characters to the Xserver, it ends up being faster in remote connections because the amount of data to send is not really larger than the amount of data fetched from the Xserver for server-side fonts (mostly in the form of the font-metrics) and suffers much less from latency because it's "send-only" instead RPC. >> Have you tried to *disable* the `x` fontBackend instead? > Yes, in fact due to bug#25216 this is my normal setup. > > ! https://bugs.gnu.org/25216 > Emacs.fontBackend: xft,ftcrhb > > Why _it_ could help, I wonder now? The idea was that it would avoid paying the cost of the `x` backend. Stefan