From: Rick Jones <[EMAIL PROTECTED]> Date: Fri, 10 Mar 2006 17:15:14 -0800
> > /* RFC3465: Slow Start > > * TCP sender SHOULD increase cwnd by the number of > > * previously unacknowledged bytes ACKed by each incoming > > * acknowledgment, provided the increase is not more than L > > */ > > if (tp->bytes_acked < tp->mss_cache) > > return; > > And only increasing cwnd after a full mss has been acked. Which IIRC is > not part of the ABC RFC. It is a core part of the RFC. > IIRC all (most of) the RFC's talk about the cwnd in bytes because at the > time VJ did his work (in hnits of packets/segments) none of the (common > -MPE did :) stacks actually knew how many segments they had outstanding > at any one time. So, we have the "increase by an MSS on each ACK" > heuristic - it didn't overly penalize bulik transfers. It was a proxy > for tracking segments, and with the existence of the ABC RFC we can > assume not all that good a proxy. > > In the original VJ paper, when a packet was known to have left the > network, the stack was free to replace it and add another. The queues > in the network are (as near as I can tell) in units of packets, not in > units of bytes. Keep in mind that Van himself was one of the primary reviewers of the ABC work. And this is even mentioned in the RFC. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
