From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: Networking hangs when too many parallel requests are made at once Date: Tue, 09 Nov 2010 14:14:58 -0800 Message-ID: <4CD9C7E2.6050909@candelatech.com> References: <4CD99E20.4060307@candelatech.com> <4CD9B09B.8040906@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Luke Hutchison Return-path: Received: from mail.candelatech.com ([208.74.158.172]:52489 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752163Ab0KIWPA (ORCPT ); Tue, 9 Nov 2010 17:15:00 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On 11/09/2010 01:17 PM, Luke Hutchison wrote: > On Tue, Nov 9, 2010 at 3:35 PM, Ben Greear wrote: >> And, a network capture of your system going into this state might >> be useful. I'd try to disable your wireless NIC entirely and focus >> on debugging the wired NIC as that is usually easier to debug. > > Sure -- a wireshark trace is here: http://web.mit.edu/~luke_h/www/trace.bz2 > > In this particular trace, I opened about 20 browser tabs at once. > They all locked up after about 5 seconds. A few of them loaded some > more content after a minute or two. A minute or two later, I killed > them all. In this particular example, pinging to a specific domain > name continued to work (it doesn't always), although I couldn't get > content from the domains in question: e.g. I could ping google.com, > but opening a new tab and trying to visit google.com caused the new > tab to hang too. Have you tried using a different DNS server (open-dns?), or maybe a caching one one your local machine? Maybe some part of your network is throwing away some of your DNS requests since you send so many at once? Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com