From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261638AbVFUN10 (ORCPT ); Tue, 21 Jun 2005 09:27:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261460AbVFUN1T (ORCPT ); Tue, 21 Jun 2005 09:27:19 -0400 Received: from opersys.com ([64.40.108.71]:32261 "EHLO www.opersys.com") by vger.kernel.org with ESMTP id S261474AbVFUNZJ (ORCPT ); Tue, 21 Jun 2005 09:25:09 -0400 Message-ID: <42B817AF.5040700@opersys.com> Date: Tue, 21 Jun 2005 09:35:43 -0400 From: Karim Yaghmour Reply-To: karim@opersys.com Organization: Opersys inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040805 Netscape/7.2 X-Accept-Language: en-us, en, fr, fr-be, fr-ca, fr-fr MIME-Version: 1.0 To: Philippe Gerum CC: Pavel Machek , linux-kernel@vger.kernel.org, Kristian Benoit Subject: Re: [PATCH 1/2] I-pipe: Core implementation References: <42B35B07.7080703@xenomai.org> <20050618170139.GA477@openzaurus.ucw.cz> <42B7272F.2040503@xenomai.org> <42B74781.8000109@opersys.com> <42B7BE86.6060502@xenomai.org> In-Reply-To: <42B7BE86.6060502@xenomai.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Philippe Gerum wrote: > Any objection to make the pipeline a static-only feature? FWIW, we conducted our tests with the I-pipe loaded as a module. Though we didn't publish that particular result as part of our earlier posting, we found that the price for having it loaded, but unused, versus not having it loaded at all made virtually no difference on overall system overhead. Such results would seem to indicate that having it as a loadable module has no specific advantage. Note, though, that we didn't do the test on all configs, just the "plain" one. Of course the issue would be much easier to decide if you could provide a brief explanation as to what the difference is, in terms of execution path, between having it compilled as a module and not loaded, versus having it built-in and unused. Karim -- Author, Speaker, Developer, Consultant Pushing Embedded and Real-Time Linux Systems Beyond the Limits http://www.opersys.com || karim@opersys.com || 1-866-677-4546