Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932494AbWBTBLi (ORCPT ); Sun, 19 Feb 2006 20:11:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932499AbWBTBLi (ORCPT ); Sun, 19 Feb 2006 20:11:38 -0500 Received: from zproxy.gmail.com ([64.233.162.202]:14217 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S932494AbWBTBLg (ORCPT ); Sun, 19 Feb 2006 20:11:36 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:date:from:to:cc:subject:message-id:references:mime-version:content-type:content-disposition:in-reply-to:user-agent; b=O5cDZwyBFSJ6A/Wp2ZOqq6mBOCuNV26YUIUuZF85yClxzxja9oXK3aw26v7cQm6KDW1vcibqVikp14zjd3P2uQ1bpADAXAYOh4AociRAESQI6kjDxvkuZHBkSZ3os7Mkpgx5nKOH8zUfcGHLUi11kvbzDRUOF9x4t+Nh24LtiRg= Date: Mon, 20 Feb 2006 05:11:30 +0200 From: Sasha Khapyorsky To: Steven Rostedt Cc: s.schmidt@avm.de, Greg KH , torvalds@osdl.org, kkeil@suse.de, LKML , opensuse-factory@opensuse.org, libusb-devel@lists.sourceforge.net, Ingo Molnar , Thomas Gleixner Subject: Re: 2.6.16 serious consequences / GPL_EXPORT_SYMBOL / USB drivers of major vendor excluded Message-ID: <20060220031130.GA9929@khap> References: <20060205205313.GA9188@kroah.com> <20060219045716.GA9880@khap> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1528 Lines: 33 On 12:02 Sun 19 Feb , Steven Rostedt wrote: > > > > differences between AVM and other devices and the difficulties regarding a > > > possible move towards user mode. > > > > > > The user space does not ensure the reliability of time critical analog > > > services like Fax G3 or analog modem emulations. This quality of service > > > can only be guaranteed within the kernel space. > > > > Soft modems may work pretty well in userspace - slmodem is example. > > > > Real-time requirement for V.34 is 40ms response time and only once during > > the session when echo canceller parameters are negotiatiated (so you may > > decrease "buffer size" before and increase after - there are enouph > > silence places for such manipulations). Fax itself does not require any > > "realtime" AFAIK, other place is almost unused today V.32 - 26ms, also > > for echo canceller setup. > > > > Disclaimer: This is in no way a push to get the -rt patch into mainline > at the moment. The patch is still young and is not ready yet. Hmm, it was not about -rt patch - 40 millisecond response time is realistic for userspace even without -rt patch. There is no guarantee, but in practice this may work very well and keep low percents of failures (much lower than permitted by standards). Sasha. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/