netdev - Re: [PATCH 5/5] tcp: skip cwnd moderation in TCP_CA_Open in tcp_try_to

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Message-ID: <CAK6E8=dfjZ0tGnihL8cvrg0J=trj2UdB5s3ry+TvdG9Yhzf9jA@mail.gmail.com>
Date:	Mon, 28 Nov 2011 12:33:12 -0800
From:	Yuchung Cheng <ycheng@...gle.com>
To:	Neal Cardwell <ncardwell@...gle.com>
Cc:	David Miller <davem@...emloft.net>, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org, nanditad@...gle.com, therbert@...gle.com
Subject: Re: [PATCH 5/5] tcp: skip cwnd moderation in TCP_CA_Open in tcp_try_to_open

On Mon, Nov 28, 2011 at 9:35 AM, Neal Cardwell <ncardwell@...gle.com> wrote:
> On Sun, Nov 27, 2011 at 7:01 PM, David Miller <davem@...emloft.net> wrote:
>> I'm apply this patch to net-next now, but Neil and Yucheng are on the hook
>> to fully look into the issues Ilpo has raised.
>
> Thanks! We will spend some time looking into these issues.
>
Ilpo do you know any report on these types of cheating? I did some
literature search but didn't find any.

If the receiver simply responds DSACK on good (non-spurious)
retransmits, the sender may increase dupthresh (tp->reordering) and
slows down triggering fast-recovery? given the connection has real
losses, the receiver may end up shooting his feet.
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