On 4 Feb 2014, at 1:38, Eggert, Lars wrote:
> Hi,
>
> below are two patches that implement RFC6937 ("Proportional Rate Reduction
> for TCP") and draft-ietf-tcpm-newcwv-00 ("Updating TCP to support
> Rate-Limited Traffic"). They were done by Aris Angelogiannopoulos for his MS
> thesis, which is at https://eggert.org/students/angelogiannopoulos-thesis.pdf.
>
> The patches should apply to -CURRENT as of Sep 17, 2013. (Sorry for the delay
> in sending them, we'd been trying to get some feedback from committers first,
> without luck.)
>
> Please note that newcwv is still a work in progress in the IETF, and the
> patch has some limitations with regards to the "pipeACK Sampling Period"
> mentioned in the Internet-Draft. Aris says this in his thesis about what
> exactly he implemented:
>
> "The second implementation choice, is in regards with the measurement of
> pipeACK. This variable is the most important introduced by the method and is
> used to compute the phase that the sender currently lies in. In order to
> compute pipeACK the approach suggested by the Internet Draft (ID) is followed
> [ncwv]. During initialization, pipeACK is set to the maximum possible value.
> A helper variable prevHighACK is introduced that is initialized to the
> initial sequence number (iss). prevHighACK holds the value of the highest
> acknowledged byte so far. pipeACK is measured once per RTT meaning that when
> an ACK covering prevHighACK is received, pipeACK becomes the difference
> between the current ACK and prevHighACK. This is called a pipeACK sample. A
> newer version of the draft suggests that multiple pipeACK samples can be used
> during the pipeACK sampling period."
>
> Lars
>
>
> [prr.patch]
>
> [newcwv.patch]Apologies for not looking at this as yet. It is now closer to the top of my list. Best, George
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