netdev - Re: TCP connection issues against Amazon S3

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Date:	Tue, 06 Jan 2015 11:48:21 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Yuchung Cheng <ycheng@...gle.com>, Erik Grinaker <erik@...gler.no>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: TCP connection issues against Amazon S3

On 01/06/2015 11:16 AM, Rick Jones wrote:
> I'm assuming one incident starts at XX:41:24.748265 in the trace?  That
> does look like it is slowly slogging its way through a bunch of lost
> traffic, which was I think part of the problem I was seeing with the
> middlebox I stepped in, but I don't think I see the reset where I would
> have expected it.  Still, it looks like the sender has an increasing TCP
> RTO as it is going through the slog (as it likely must since there are
> no TCP timestamps?), to the point it gets larger than I'm guessing curl
> was willing to wait, so the FIN at XX:41:53.269534 after a ten second or
> so gap.

Should the receiver's autotuning be advertising an ever larger window 
the way it is while going through the slog of lost traffic?

rick
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