From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: Re: Transmit mark during connection destruction event Date: Tue, 29 Jan 2008 15:16:06 +0100 Message-ID: <479F3526.10306@netfilter.org> References: <20080128231323.GA24226@localhost> <479F2C54.8030109@trash.net> <479F3183.6030905@netfilter.org> <479F2EDD.2000000@trash.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: Eric Leblond , netfilter-devel@vger.kernel.org To: Patrick McHardy Return-path: Received: from mail.us.es ([193.147.175.20]:34740 "EHLO us.es" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932529AbYA2OQN (ORCPT ); Tue, 29 Jan 2008 09:16:13 -0500 In-Reply-To: <479F2EDD.2000000@trash.net> Sender: netfilter-devel-owner@vger.kernel.org List-ID: Patrick McHardy wrote: > Pablo Neira Ayuso wrote: >> Patrick McHardy wrote: >>> Eric Leblond wrote: >>>> The following feature was submitted some months ago. It forces the dump >>>> of mark during the connection destruction event. The induced load is >>>> quiet small and the patch is usefull to provide an easy way to filter >>>> event on user side without having to keep an hash in userspace. >>>> >>>> This new version is against 2.6.24 git tree. >>> It clashed with some changes I had queued locally, but I fixed it >>> up and applied it. Thanks Eric. >> >> Please, hold it on. I don't see the point of consuming 8 extra byte in >> every extra destroy message. You have tons of resources in userspace to >> implement whatever performance structure to store the conntrackd but we >> do have limited bandwidth in netlink. Instead we may dump the id but I >> don't support this option either. > > I agree with Eric, its a useful option for avoiding overhead in > userspace, and what counts in the end is the accumulated overhead > of both kernel and userspace. If userspace can avoid dealing with > tuples and complicated bookkeeping it can read messages faster, > thus avoiding recv-queue overflows. Then, dump the id but not the mark if he wants to identify a conntrack. -- "Los honestos son inadaptados sociales" -- Les Luthiers