From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Jones Subject: Re: [PATCH net-next] doc: make the description of how tcp_ecn works more explicit and clear Date: Thu, 29 Nov 2012 10:58:28 -0800 Message-ID: <50B7B054.3090607@hp.com> References: <20121128195310.C438D2900459@tardy> <20121129.131627.987805831377793894.davem@davemloft.net> <1354214521.3299.30.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: David Miller , netdev@vger.kernel.org To: Eric Dumazet Return-path: Received: from g4t0017.houston.hp.com ([15.201.24.20]:37856 "EHLO g4t0017.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752545Ab2K2S63 (ORCPT ); Thu, 29 Nov 2012 13:58:29 -0500 In-Reply-To: <1354214521.3299.30.camel@edumazet-glaptop> Sender: netdev-owner@vger.kernel.org List-ID: On 11/29/2012 10:42 AM, Eric Dumazet wrote: > On Thu, 2012-11-29 at 13:16 -0500, David Miller wrote: >> From: raj@tardy.usa.hp.com (Rick Jones) >> Date: Wed, 28 Nov 2012 11:53:10 -0800 (PST) >> >>> From: Rick Jones >>> >>> Make the description of how tcp_ecn works a bit more explicit and clear. >>> >>> Signed-off-by: Rick Jones >> >> Applied, thanks Rick. Am I correct in assuming that the documentation is supposed to word-wrap somewhere around 72 columns? If so, as I have time for floor sweeping I can try to go through more of it. >> I think we should change the default to one, to be honest. I thought >> that's what we were doing by now... You weren't the only one - what triggered my looking at that description in the first place was an assertion in the tcpm mailing list that Linux defaulted to ecn enabled. >> '2' made sense 10 years ago, but it doesn't really today. > > With 1 setting, I for example was enable to connect to a HP device, > when I was still working for SFR. > > (It was an HTTP/HTTPS based administrative software, to manage HP c7000 > enclosures) If you have some of the particulars, feel free to send them to me offline. Being one of the cobbler's children I cannot make promises but I can try to see if whatever it was has evolved since then. > I would suggest making a large scale experiment before doing this 2->1 > move. Perhaps one or more of the "development oriented" (term?) distros can ship with a sysctl.conf file that sets it to one? Or some companies with rather large Internet presence. At the time of the tcpm message I went ahead and set it to one on netperf.org but that is far from a large scale experiment. It has been a couple weeks and I've captured almost 250000 SYN segments (netperf.org isn't all that busy). My recollection is that at least one search engine provider's bots were negotiating ECN and one noteable one was not. I'd think a search engine provider's crawlers would be a large scale experiment. rick jones