On Tue, May 19, 2015 at 12:16 AM, Stephen Hemminger <step...@networkplumber.org> wrote: > > I am really happy to see more congestion control development.
:) > > Module parameters make for rather ugly tuning. > They are ok for testing but difficult to use in real life. CDG's throughput-delay tradeoff is affected by the parameters window, backoff_beta, and backoff_factor. Most users will likely use the default parameters, but others might want to tune them for less queueing delay, more throughput, slower backoff response, etc. window is a difficult parameter to get right when tuning; it is intrinsically RTT-dependent, but also influences CDG's RTT-independent backoff probability.. For the record, CDG as a congestion control is still RTT-dependent, e.g., it uses NewReno to grow cwnd. The upcoming patch renames ineffective_thresh to detect_ineff, and removes ineffective_hold. Grepping experiment logs, I never once saw the hold function kick in. A threshold of 5 is also overly conservative when limiting the shadow window to 2*cwnd; a threshold of 1 is a better starting point. Thanks to Eric, Yuchung and Stephen for your feedback! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
