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Title: Satoshi client wasting bandwidth, getting blocks multiple times Post by: deepceleron on October 28, 2012, 08:42:15 PM I have 16 connections at present and am downloading blocks off the main network. I have noticed what appears to be my copy of Bitcoin receiving the same blocks multiple times in the logs:
... received block 000000000000011a4403 SetBestChain: new best=000000000000011a4403 height=196196 work=450654222657382946220 date=08/29/12 05:28:42 ProcessBlock: ACCEPTED received block 000000000000026a75f9 SetBestChain: new best=000000000000026a75f9 height=196197 work=450664705297513269032 date=08/29/12 06:04:29 ProcessBlock: ACCEPTED Added 1 addresses from 178.148.109.206: 27 tried, 8031 new Added 1 addresses from 193.106.95.138: 27 tried, 8031 new Added 1 addresses from 173.67.5.248: 27 tried, 8032 new Added 1 addresses from 86.143.13.243: 27 tried, 8032 new received block 00000000000000901487 ERROR: ProcessBlock() : already have block 196036 00000000000000901487 received block 00000000000004a374f9 ERROR: ProcessBlock() : already have block 196037 00000000000004a374f9 received block 0000000000000599d86b ERROR: ProcessBlock() : already have block 196038 0000000000000599d86b received block 00000000000006c2bb3c ERROR: ProcessBlock() : already have block 196039 00000000000006c2bb3c Added 1 addresses from 176.9.122.123: 27 tried, 8033 new received block 00000000000006af9443 ERROR: ProcessBlock() : already have block 196154 00000000000006af9443 received block 0000000000000459c29f ERROR: ProcessBlock() : already have block 196155 0000000000000459c29f received block 00000000000002fd4225 ERROR: ProcessBlock() : already have block 196156 00000000000002fd4225 received block 0000000000000308ea4e ERROR: ProcessBlock() : already have block 196157 0000000000000308ea4e received block 00000000000003d1fe23 ERROR: ProcessBlock() : already have block 196158 00000000000003d1fe23 received block 000000000000006ebef9 ERROR: ProcessBlock() : already have block 196159 000000000000006ebef9 received block 000000000000039009c6 ERROR: ProcessBlock() : already have block 196160 000000000000039009c6 received block 000000000000020904b3 ERROR: ProcessBlock() : already have block 196161 000000000000020904b3 received block 00000000000004b8c6b0 ERROR: ProcessBlock() : already have block 196162 00000000000004b8c6b0 received block 000000000000003569d4 ERROR: ProcessBlock() : already have block 196163 000000000000003569d4 received block 000000000000032f4bf4 ... Here's a much longer log: http://www.jine.be/91310 Not an isolated case, it happens every few minutes or more often. The duplicate blocks can be a few or a hundred blocks behind. This appears to be either multiple peers responding to a request for blocks, or the same peer resending multiple datas. This could make a 3GB download take much more bandwidth than that if I am interpreting the log correctly. bitcoind 0.7.1 windows Comments before I go bug-filing? Title: Re: Satoshi client wasting bandwidth, getting blocks multiple times Post by: malevolent on October 28, 2012, 10:51:31 PM Maybe the other bitcoin nodes are on slow machines processing blocks or with a slow connection?
edit: or getblock message issues Title: Re: Satoshi client wasting bandwidth, getting blocks multiple times Post by: gmaxwell on October 31, 2012, 02:58:57 AM I have 16 connections at present and am downloading blocks off the main network. I have noticed what appears to be my copy of Bitcoin receiving the same blocks multiple times in the logs: This is generally a known behaviour. What happens is that you are doing the initial block download forward, and then a new block happens on the network and you try to connect it (backwards) to your chain... so you start pulling and pulling and before you make it all the way back there is a new block on the network.. and you sweep over them. IIRC it's not actually downloading them twice, but they show up in invs and you note you already have them and don't getdata them. |