From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932529AbVHSAP7 (ORCPT ); Thu, 18 Aug 2005 20:15:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932531AbVHSAP7 (ORCPT ); Thu, 18 Aug 2005 20:15:59 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:40640 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S932529AbVHSAP6 (ORCPT ); Thu, 18 Aug 2005 20:15:58 -0400 Subject: Re: [PATCH 2.6.13-rc6 1/2] New Syscall: get rlimits of any process (update) From: Lee Revell To: Alan Cox Cc: e8607062@student.tuwien.ac.at, linux-kernel , Elliot Lee In-Reply-To: <1124411388.20755.20.camel@localhost.localdomain> References: <1124326652.8359.3.camel@w2> <1124381951.6251.14.camel@w2> <1124389061.5973.33.camel@mindpipe> <1124406811.20755.16.camel@localhost.localdomain> <1124407014.10991.31.camel@mindpipe> <1124411388.20755.20.camel@localhost.localdomain> Content-Type: text/plain Date: Thu, 18 Aug 2005 20:15:55 -0400 Message-Id: <1124410556.10991.49.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.3.7 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-08-19 at 01:29 +0100, Alan Cox wrote: > On Iau, 2005-08-18 at 19:16 -0400, Lee Revell wrote: > > A search for a 200MB file tells you it's available on 2000 hosts, all of > > whom are on dialup. > > What about the real world ? > OK that was a poorly contrived example. Anyway the specific numbers don't matter as much; it's actually quite a common scenario to run out of FDs before you can fill the pipe. It happens to me about once a week. Modern P2P protocols all seem to use some type of "swarming". IIRC the inspiration was the DDOS attacks of the late 90s - thousands of hosts on slow connections can fill even the fattest pipe. Lee