Hi, the newcwv patch is probably stale now with Tom Jones' recent patch based on a more up-to-date version of the Internet-Draft, but the PRR patch should still be useful?
Lars
On 2014-6-19, at 23:35, George Neville-Neil <g...@neville-neil.com> wrote:
> 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 A newer version of the draft suggests that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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