From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by befuddled.reisers.ca (Postfix, from userid 65534) id E063D1EFD57; Sat, 19 Nov 2016 17:05:21 -0500 (EST) Received: from hera.aquilenet.fr (hera.aquilenet.fr [IPv6:2a01:474::1]) by befuddled.reisers.ca (Postfix) with ESMTP id 356971EFD4A for ; Sat, 19 Nov 2016 17:05:00 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id B67A59A6E for ; Sat, 19 Nov 2016 23:04:59 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id myYl-r81IHof for ; Sat, 19 Nov 2016 23:04:59 +0100 (CET) Received: from var.youpi.perso.aquilenet.fr (unknown [IPv6:2a01:cb19:181:c200:3602:86ff:fe2c:6a19]) by hera.aquilenet.fr (Postfix) with ESMTPSA id 4E14F6F6A for ; Sat, 19 Nov 2016 23:04:59 +0100 (CET) Received: from samy by var.youpi.perso.aquilenet.fr with local (Exim 4.88) (envelope-from ) id 1c8Dko-0002VH-QB for speakup@linux-speakup.org; Sat, 19 Nov 2016 23:04:58 +0100 Date: Sat, 19 Nov 2016 23:04:58 +0100 From: Samuel Thibault To: "Speakup is a screen review system for Linux." Subject: Re: using system serial drivers Message-ID: <20161119220458.GL3422@var.home> References: <20161119162834.GA2026@db> <20161119214709.GF3422@var.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161119214709.GF3422@var.home> User-Agent: Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 X-BeenThere: speakup@linux-speakup.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Speakup is a screen review system for Linux." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 Nov 2016 22:05:22 -0000 Samuel Thibault, on Sat 19 Nov 2016 22:47:09 +0100, wrote: > David, on Sat 19 Nov 2016 11:28:34 -0500, wrote: > > Have any of you bothered to read the code in the driver you are calling > > and see what overhead is imposed on entry/exit? It is quite abit. > > That's still extremely slow compared to the actual time spent by > hardware to send the bytes over the wire. Oops, sorry, I meant "low" instead of "slow". Samuel