From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-px0-f180.google.com ([209.85.216.180]:35349 "EHLO mail-px0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753422AbZKZX2H (ORCPT ); Thu, 26 Nov 2009 18:28:07 -0500 Date: Thu, 26 Nov 2009 15:28:09 -0800 From: Dmitry Torokhov To: Krzysztof Halasa Cc: Jarod Wilson , Devin Heitmueller , Christoph Bartelmus , awalls@radix.net, j@jannau.net, jarod@redhat.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@redhat.com, superm1@ubuntu.com Subject: Re: [RFC] Should we create a raw input interface for IR's ? Message-ID: <20091126232809.GE6936@core.coreip.homeip.net> References: <829197380911251020y6f330f15mba32920ac63e97d3@mail.gmail.com> <20091126055302.GI23244@core.coreip.homeip.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-media-owner@vger.kernel.org List-ID: On Thu, Nov 26, 2009 at 07:40:01PM +0100, Krzysztof Halasa wrote: > Dmitry Torokhov writes: > > > Why would sysfs write be slower than ioctl? > > Sysfs is generally one-value, one-file. open, read/write, close. > ioctl() OTOH does everything (e.g. a whole key table) in one syscall. There are binary sysfs attributes. For ioctl you also need to open and close the device. Plus, how often do you expect to perform this operation? Don't you think you are trying to optimize something that does not have any real performavnce impact here? -- Dmitry