Hello! > 2) a way to take delayed ACKs into account for cwnd growth
This part is OK now, right? > 1) protection against ACK division But Linux never had this problem... Congestion window was increased only when a whole skb is ACKed, flag FLAG_DATA_ACKED. (TSO could break this, but should not). Otherwise, this ACK just advanced snd_una and nothing more. This aspect of ABC is crucial for BSD. TCP_NODELAY sockets did not obey congestion control there. From the very beginning, before slow start it can send thousands of 1 byte segments. The only problem of kind "too-aggressive" with Linux was that we could develop large cwnd sending small segments, and then switch to sending mss-sized segments. It does not look scary, to be honest. :-) Linux had troubles with slow start even before ABC. Actually, some of applications can suffer of the same syndrome even if ABC disabled. With ABC it becomes TROUBLE, cwnd has no chances to develop at all. Probably, aspect 1 of ABC just should be disabled. And the first my suggestion looks working too. Alexey - 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
