Re: [PATCH][RFC] Re: high latency with TCP connections

[David Miller <davem@davemloft.net>]

From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Date: Mon, 4 Sep 2006 20:00:45 +0400

> Try enclosed patch. I have no idea why 9.997 sec is so magic, but I
> get exactly this number on my notebook. :-)
> 
> =================
> 
> This patch enables sending ACKs each 2d received segment.
> It does not affect either mss-sized connections (obviously) or connections
> controlled by Nagle (because there is only one small segment in flight).
> 
> The idea is to record the fact that a small segment arrives
> on a connection, where one small segment has already been received
> and still not-ACKed. In this case ACK is forced after tcp_recvmsg()
> drains receive buffer.
> 
> In other words, it is a "soft" each-2d-segment ACK, which is enough
> to preserve ACK clock even when ABC is enabled.
> 
> Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>

This looks exactly like the kind of patch I tried to formulate,
very unsuccessfully, last time this topic came up a year or
so ago.

It looks perfectly fine to me, would you like me to apply it
Alexey?