Re: [Bitcoin-development] [Bulk] Re: Fwd: Block Size Increase Requirements
On Sun, May 31, 2015 at 9:31 AM, gb kiw...@yahoo.com wrote: Aren't you calculating bandwidth for a singly-connected node? A highly connected miner could have 30-100 node connections so you probably need to increase your traffic estimates by that factor. I.e. For 100MB blocks, 30-100 Mbps and $60-$100 per day data costs. No, randomly connected gossip networks (which is what the Bitcoin p2p network is) don't work that way, bandwidth is (roughly) O(N) where N is the number of bytes relayed to everybody. (it is actually a small multiple of N, because of the overhead of 'inv' messages, and if we ever get really serious about scaling up we'll need to fix the protocol to reduce that overhead, but that won't be a problem for years). -- -- Gavin Andresen -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
Re: [Bitcoin-development] [Bulk] Re: Fwd: Block Size Increase Requirements
Aren't you calculating bandwidth for a singly-connected node? A highly connected miner could have 30-100 node connections so you probably need to increase your traffic estimates by that factor. I.e. For 100MB blocks, 30-100 Mbps and $60-$100 per day data costs. You should be able to handle 20MB blocks no problem; if I round up to 100MB per block that works out to 1.3Mbps. We also use Aliyun and Linode cloud services for block propagation. As of May 2015, the price is 0.13 U.S. dollars per GB for 100Mbps connectivity at Aliyun. That speed will handle 20MB blocks no problem. If each 20MB block is 100MB of data up/down the wire (I'm vastly over-estimating, after optimization it should be 40MB) then you'll be paying...uhhh: 0.1 GB / block-data-on-wire * 144 blocks/day * 30.5 days/month * 0.13 $ / GB = $57 Less than $2 per day in bandwidth. For a single cross-border TCP connection, it would be certainly far slower than 12.5 MB/s. That's OK, you'll 1.3Mbps or less -- -- Gavin Andresen -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
