On 10/9/2015 11:52 AM, David Lang wrote: > On Fri, 9 Oct 2015, Joe Touch wrote: > >> Dave in particular wanted some specific reasons this is a bad idea as >> presented. Here is my summary. >> >> The rest of this discussion should happen on TCPM. >> >> Joe >> >> --- >> >> 1) *you* shouldn't be using a mechanism that destroys information for >> others >> >> whether the timestamps or ACK stream spacing has any >> meaning is for the receiver - not you - to decide > > The temporal spacing is already lost.
You don't know that won't be restored downstream. >> 2) *you* don't know where your mechanism will have an impact >> >> those clumped ACKs might be spaced out further >> downstream >> >> even if you have a rule of "I'll only gather 3 ACKs", >> you can't know if another box - including yours - >> downstream might gather those composite ACKs further >> >> 3) you claim this might be safe *if* AQM is widely deployed >> >> but *you* don't appear to be making that determination >> *before* deploying your approach >> >> also, AQM is in the opposite direction, and unless >> you deploy this with enough state to track the fact >> that your box is seeing traffic in both directions, >> you shouldn't be turning it on at all > > this discussion started in the context of AQM. AQM is needed in both > directions, it's not a one-direction only thing. Needed, but you don't *know* it's deployed on both path directions. The reverse path could be taking a different route. >> As others have noted, the SHOULD of ACK requirements can be exceeded, >> but only with careful consideration of the potential impact. That >> careful consideration does not consist of "I turned it on and I didn't >> hear anyone scream". > > that's not the only consideration here. There's also the consideration > that the ACK stream is already badly distorted. It's not distorted at all - it's queued up and waiting its turn. > As it turns out (as discussed on the other thread), the RFC actually > recommends what we was proposed (with some additional nuances) Assuming that you know what you can't know and assuming that you don't care whether your actions affect what others have a right to assume. Joe _______________________________________________ aqm mailing list [email protected] https://www.ietf.org/mailman/listinfo/aqm
