Re: [tcpm] [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-00.txt

["Scharf, Michael" <[e-mail]>]

> > I do however note that SYN is described as the most important packet to
> protect with ECN, and this is of course sent before AccECN negotiation has
> completed.  Further, if the SYN-ACK then indicates that AccECN is *not*
> supported by the remote end - which would be the case for both an SCE
> endpoint and any conventional one - a conservative IW of 1 segment SHOULD
> be conservatively selected, with no modification for the increasingly common
> IW10 case (the default for current versions of Linux).  This incurs a flow
> completion time delay of approximately 3 RTTs, which could be perceptible to
> end users.
> The draft explains: the reduction to IW1 is in the client to server
> direction. It cites measurement studies that show it's unusual to get >1
> initial packet in that direction anyway. And the reduction to 1 is only
> a SHOULD. An implementation could choose 2 for instance.
> 
> When new to the IETF, it's even more important to read the draft before
> sending critique (cos you won't have heard all the previous discussion).
> Otherwise it burns busy people's time on the list unnecessarily.

I'd like to remind people that comments from people new to the IETF _are_ welcome in TCPM and elsewhere in the IETF.

Michael (as chair)