From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Subject: Re: [PATCH 18/29] netfilter: notify about NF_QUEUE vs emergency skbs Date: Sat, 24 Feb 2007 17:40:38 +0100 Message-ID: <45E06A86.2060408@trash.net> References: <20070221144304.512721000@taijtu.programming.kicks-ass.net> <20070221144843.299254000@taijtu.programming.kicks-ass.net> <45E05954.8050204@trash.net> <1172332010.28579.6.camel@lappy> <45E064FF.8010000@trash.net> <1172333937.6374.47.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, Trond Myklebust , Thomas Graf , David Miller To: Peter Zijlstra Return-path: Received: from stinky.trash.net ([213.144.137.162]:55536 "EHLO stinky.trash.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750934AbXBXQkn (ORCPT ); Sat, 24 Feb 2007 11:40:43 -0500 In-Reply-To: <1172333937.6374.47.camel@twins> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Peter Zijlstra wrote: > On Sat, 2007-02-24 at 17:17 +0100, Patrick McHardy wrote: > > >>I don't really see why >>queueing is special though, dropping the packets in the ruleset >>will break things just as well, as will routing them to a blackhole. >>I guess the user just needs to be smart enough not to do this. > > > Its user-space and no emergency packet may rely on user-space because it > most likely is needed to maintain user-space. I believe I might have misunderstood the intention of this patch. Assuming the user is smart enough not to queue packets destined to a SOCK_VMIO socket, are you worried about unrelated packets allocated from the emergency reserve not getting freed fast enough because they're sitting in a queue? In that case simply dropping the packets would be fine I guess.