From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261835AbTDKWSH (for ); Fri, 11 Apr 2003 18:18:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261839AbTDKWSH (for ); Fri, 11 Apr 2003 18:18:07 -0400 Received: from fw-az.mvista.com ([65.200.49.158]:47609 "EHLO zipcode.az.mvista.com") by vger.kernel.org with ESMTP id S261835AbTDKWSG (for ); Fri, 11 Apr 2003 18:18:06 -0400 Message-ID: <3E9741FD.4080007@mvista.com> Date: Fri, 11 Apr 2003 15:30:21 -0700 From: Steven Dake User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Greg KH CC: "Kevin P. Fleming" , linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, message-bus-list@redhat.com Subject: Re: [ANNOUNCE] udev 0.1 release References: <20030411172011.GA1821@kroah.com> <200304111746.h3BHk9hd001736@81-2-122-30.bradfords.org.uk> <20030411182313.GG25862@wind.cocodriloo.com> <3E970A00.2050204@cox.net> <3E9725C5.3090503@mvista.com> <20030411204329.GT1821@kroah.com> In-Reply-To: <20030411204329.GT1821@kroah.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org There is no "spec" that states this is a requirement, however, telecom customers require the elapsed time from the time they request the disk to be used, to the disk being usable by the operating system to be 20 msec. Its even more helpful for their applications if the call that hotswap inserts blocks until the device is actually ready to use and available in the filesystem. Another requirement of any system that attempts to replace devfs would be this capability (vs constantly checking for the device in the filesystem). Greg KH wrote: >On Fri, Apr 11, 2003 at 01:29:57PM -0700, Steven Dake wrote: > > >>It gets even worse, because performance of hotswap events on disk adds >>is critical and spawning processes is incredibly slow compared to the >>performance required by some telecom applications... >> >> > >It's critical that we quick name this disk within X milliseconds after >it has been added to the system? What spec declares this? > >thanks, > >greg k-h > > > > >