From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kay Sievers Date: Thu, 19 Feb 2004 07:52:55 +0000 Subject: Re: [PATCH] closing the loop -- retries and acks Message-Id: <1077177175.1129.16.camel@pim> List-Id: References: <403305A3.2070604@sympatico.ca> In-Reply-To: <403305A3.2070604@sympatico.ca> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Thu, 2004-02-19 at 06:44, Chris Friesen wrote: > Kay Sievers wrote: > > On Wed, Feb 18, 2004 at 01:26:43AM -0500, Chris Friesen wrote: > > > >>This patch reduces the already low chances of lost messages. > > > It's sweet. > > But isn't the case of handling a lost a message purely theroretical? > > Sure. But then, all error handling is theoretical. > I don't share this point. It's a question of econonmics all the time and adding a transaction handling over a reliable communication for a case with nearly no propabilty and all "critical" work somewhere else, sounds really theroetical to me. > > What problem we actually have is solved with this infrastructure? > > A possibly crashing or exiting udevd in the time window from accepting > > our message until its execution? > > Yes. Which could be up to 5 seconds if the sequence number is wrong. > > > Is the handling of this special case really needed? > > That's up to Greg, I guess. > > > Oh, and we don't handle a crashing udev :) > > We would if this patch was added... > > > We have a remaining risk all over the place and it seems that we try to > > look better than the whole picture. We have failure paths with much > > much higher propability. > > > > So, it's nice, sure. > > But is it worth the extra complexity? > > That is indeed the question. It would be nice to lock down every > possible problem, but I don't know if that's feasable. > Every possible problem? I don't think, that we should ever try that :) thanks, Kay ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id56&alloc_id438&op=click _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel