Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754563AbZA1Ezp (ORCPT ); Tue, 27 Jan 2009 23:55:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752488AbZA1Ezh (ORCPT ); Tue, 27 Jan 2009 23:55:37 -0500 Received: from out2.smtp.messagingengine.com ([66.111.4.26]:38584 "EHLO out2.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752486AbZA1Ezg (ORCPT ); Tue, 27 Jan 2009 23:55:36 -0500 Date: Wed, 28 Jan 2009 15:55:34 +1100 From: Bron Gondwana To: Davide Libenzi Cc: Ray Lee , Bron Gondwana , Linux Kernel Mailing List , Greg KH , Andrew Morton Subject: Re: [PATCH 1/3] epoll: increase default max_user_instances to 1024 Message-ID: <20090128045534.GA7571@brong.net> References: <20090128033824.GA1662@brong.net> <59410684d947bc68862a4f5d6c2a5bb1f29519ee.1233114169.git.brong@fastmail.fm> <2c0942db0901272007w4298738cq37918f776276d424@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: brong.net User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1447 Lines: 32 On Tue, Jan 27, 2009 at 08:14:36PM -0800, Davide Libenzi wrote: > On Tue, 27 Jan 2009, Ray Lee wrote: > > Userspace is not broken here, and the whole idea of a -stable series > > is that administrators can upgrade to them without having to worry > > about things getting broken or making specific configuration changes > > by point release. > > The reason Greg took it, was that in a multiuser systems, that's a DoS > EZ-PZ Lemon Squeezie. Ok - we're at an impasse here. You know the code a whole lot better than me. Is there anything you can think of that will allow us to block the DOS without breaking every medium to heavily loaded postfix and apache site out there. Somthing that doesn't require the administrators of every single machine in one or the other class to tune their configurations? Brong ( we expect you to know how to tune epoll, we don't expect every apache and postfix administrator to know to tune a brand new setting that just appeared in the last point release - especially since most of them probably have no idea how many epoll watches their software creates as a single user, and have never needed to think about it before) -- 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/