netdev - Re: TCP connection issues against Amazon S3

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Message-ID: <1420569175.5947.4.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 06 Jan 2015 10:32:55 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Erik Grinaker <erik@...gler.no>
Cc:	linux-kernel@...r.kernel.org, Yuchung Cheng <ycheng@...gle.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: TCP connection issues against Amazon S3

On Tue, 2015-01-06 at 18:17 +0000, Erik Grinaker wrote:

> Yes, pcap was taken on receiver (195.159.221.106).
> 
> > If the sender is broken, changing the kernel on receiver wont help.
> > 
> > BTW not using sack (on 54.231.132.98) is terrible for performance in
> > lossy environments.
> 
> It may well be that the sender is broken; however, the sender is
> Amazon S3, so I do not have any control over it. And in any case, the
> problem goes away with 3.11.10 on receiver, but persists with 3.12.0
> (or later) on receiver, so there must be some change in 3.12.0 which
> has caused this to trigger.

In fact I saw nothing obviously wrong in pcap (but I have not done a
full analysis)

It might simply be an application bug, triggering a timeout too soon.

A kernel change can be good, but by changing timings a bit, trigger
application bugs.


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