On Fri, May 23, 2014 at 8:57 PM, Ashley Holman <dsc...@gmail.com> wrote: > Hi, > On this list there has been some discussion around techniques to speed up > block propagation, with a particular focus on reducing the extra orphan risk > carried by larger blocks. > The current store-and-forward method means that larger blocks will propagate > with higher latency.
FWIW, there are a lot of improvements which can be made before more complex changes like cut-through-forwarding that change the protocol. For example, the reference software has a 100ms sleep in p2p message processing which could be replaced with a semaphore, this would dramatically lower latency for block relaying. Likewise nodes which are becoming bandwidth overloaded could adapt their concurrent connection counts down (and ones that are underloaded could accept more connections). Relaying to multiple peers could be done in parallel instead of serialized, and the order in which peers are relayed to could be adapted to place more apparently useful and faster peers first, e.g. every time a peer is the first to tell you about a block or transaction you accept they move up the list, every time their socket send queue fills they move down. Luke-Jr had implemented cut through behavior previously and had posted a patch, but absent those other network processing improvements it didn't appear to help. If you want to go full out crazy in optimizing in this space, there are fancier things that can be done to further reduce latency and increase efficiency: https://en.bitcoin.it/wiki/User:Gmaxwell/block_network_coding ... but some of this stuff really should be done as a seperate protocol. There is no need to have Bitcoin transport all using a single protocol, and we can get better robustness and feature velocity if there are a couple protocols in use (you could just run a block-transport-protocol daemon that connects to your local node via the classic protocol). ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
