netdev - Re: [PATCH net-next] tcp: be more strict before accepting ECN negociation

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Date:	Fri, 04 May 2012 11:48:49 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Perry Lorier <perryl@...gle.com>,
	Matt Mathis <mattmathis@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Tom Herbert <therbert@...gle.com>,
	Wilmer van der Gaast <wilmer@...gle.com>,
	Dave Täht <dave.taht@...ferbloat.net>,
	Ankur Jain <jankur@...gle.com>
Subject: Re: [PATCH net-next] tcp: be more strict before accepting ECN negociation

On 05/04/2012 11:23 AM, Eric Dumazet wrote:
> On Fri, 2012-05-04 at 11:09 -0700, Rick Jones wrote:
>> What sort of networks were these?  Any chance it was some sort of
>> attempt to add ECN to FastOpen?
>
> Nothing to do with fastopen.
>
> Just take a look at a random http server and sample all SYN packets it
> receives.
>
> Some of them have TOS bits 0 or 1 set, or even both bits set.

I'll fire-up tcpdump on netperf.org:

tcpdump -i eth0 -vvv '(tcp[tcpflags] & tcp-syn != 0) && (ip[1] != 0x0)'

and see what appears.

rick
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