netdev - Re: [PATCH 4/5] tcp: allow undo from reordered DSACKs

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Message-ID: <CADVnQykS7w_OzQBa=Lqw=EU=qkXxsXeWSwfVrRj+_Yx4NgxHGw@mail.gmail.com>
Date:	Mon, 28 Nov 2011 12:31:41 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org,
	nanditad@...gle.com, ycheng@...gle.com, therbert@...gle.com
Subject: Re: [PATCH 4/5] tcp: allow undo from reordered DSACKs

On Sun, Nov 27, 2011 at 6:58 PM, David Miller <davem@...emloft.net> wrote:
> In order to make forward progress I've added Neil's patch to net-next.

Thanks!

>> Also, one (serious) word of caution! This change, by its extending of
>> CA_Open state, is somewhat similar to what I made FRTO years ago, and
>> managed to introduces subtle breaking to the state machine. Please check
>> that the problem similar to what was fixed by
>> a1c1f281b84a751fdb5ff919da3b09df7297619f does not reappear (possibly in
>> some other form causing spurious undos). ...To me it seems that
>> tcp_packet_delayed might be similarly confused after the given patch.
>
> Neil, please look into this so we can have any such issues fixed
> in time for the next merge window.

Absolutely. I will look into the areas that Ilpo mentioned.

neal
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