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Re: [lwip-users] LWIP and sliding window

From: Kieran Mansley
Subject: Re: [lwip-users] LWIP and sliding window
Date: Thu, 01 Oct 2009 11:04:45 +0100

On Thu, 2009-10-01 at 02:38 -0700, Yann Suisini wrote:
> so, the TCP stack only allows to send one frame one to one . the stack uses
> a little trick to force the ACK from remote to avoid delayed ACK  :
> IF you want to send 1000 bytes of data , the stack send a first frame of 996
> bytes , immediately followed by another frame with the last 4 bytes. This is
> the only optimization for the bandwidth ... :,( 

That sucks, and their trick is not guaranteed to work - lots of modern
stacks count bytes received and base the delayed ACK trigger on that
rather than the number of segments.


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