Re: [tcpm] [Tmrg] Increasing the Initial Window - Notes

[John Heffner <[e-mail]>]

Why is this mechanism required for IW=10 but not for IW=3?

  -John


On Thu, Nov 18, 2010 at 4:08 PM, Joe Touch <[e-mail]> wrote:
> That's basically what I'm suggesting; it can easily be per subnet, per
> interface, or per the entire machine as desired.
>
> The ultimate point is:
>
>        - put something in the end node that notices if/when
>        it fails objectively, and fixes it
>
>        - that same thing can allow the IW to increase
>        over time if there are no problems
>
> I'll be glad to write this up if people need a more concrete proposal.
>
> Joe
>
> On 11/18/2010 1:05 PM, Anantha Ramaiah (ananth) wrote:
>>
>> Why can't you do something like this :
>>
>> - If any one of the TCP connections egressing out of that interface
>> (this can determined in TCP layer) is in the TCP retransmit state (or
>> has experienced congestion in the past xxx secs/mins), then go back to a
>> lower IW for new TCP connections which are using the same output
>> interface..
>>
>> - When you want to start a connection, use the connection history (Joe's
>> RFC)
>>
>> Well, there may be some gotchas of this scheme, but you can become
>> conservative when there is some concrete information.
>>
>> Thanks,
>> -Anantha
>>>
>>> To be more clear, here's the case:
>>>
>>>        start 1000 connections in a row.
>>>
>>>        during the first connection, lose some packets and do
>>>        normal TCP backoff
>>>
>>>        so what do the other 999 connections start with?
>>>        ans: 10 packets
>>>
>>> The point is that subsequent connections don't do anything different.
>>> If
>>> you have 1000 connections, you're sending a certain amount of data
>>
>> into
>>>
>>> the network without reacting. We're tripling that.
>>>
>>> That can easily cause congestion. At which point the *existing*
>>> connections will backoff, but new connections keep making problems.
>>>
>>> Joe
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>
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