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[lwip-devel] [task #14128] Appropriate byte counting/stretch ACK support

From: Joel Cunningham
Subject: [lwip-devel] [task #14128] Appropriate byte counting/stretch ACK support
Date: Fri, 3 Mar 2017 19:04:02 -0500 (EST)
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Follow-up Comment #11, task #14128 (project lwip):

I'm further down the rabbit hole now.

Turns out that Linux also had a previous implementation that was closer to ABC
as described in the RFC except for one strange behavior: It only incremented
cwnd once a full segment had been received (or two full segments in the L = 2
* SMSS case).  You can see the man page description of the feature here (under


I found posts on the mailing list where the feature was eventually disabled by
default because it penalized small application writes and then removed in

I also found that NetBSD has an implementation of ABC which matches pretty
closely to the RFC and was what I was thinking of for LwIP (see



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