Andrew Chow 22d96d76ab Merge bitcoin/bitcoin#25720: p2p: Reduce bandwidth during initial headers sync when a block is found ...

f6a916683d Add functional test for block announcements during initial headers sync (Suhas Daftuar)
05f7f31598 Reduce bandwidth during initial headers sync when a block is found (Suhas Daftuar)

Pull request description:

  On startup, if our headers chain is more than a day behind current time, we'll pick one peer to sync headers with until our best headers chain is caught up (at that point, we'll try to sync headers with all peers).

  However, if an INV for a block is received before our headers chain is caught up, we'll then start to sync headers from each peer announcing the block.  This can result in doing a big headers sync with many (if not all) of our peers simultaneously, which wastes bandwidth.

  This PR would reduce that overhead by picking (at most) one new peer to try syncing headers with whenever a new block is announced, prior to our headers chain being caught up.

ACKs for top commit:
  LarryRuane:
    ACK f6a916683d
  ajtowns:
    ACK f6a916683d
  mzumsande:
    ACK f6a916683d
  dergoegge:
    Code review ACK f6a916683d
  achow101:
    ACK f6a916683d

Tree-SHA512: 0662000bd68db146f55981de4adc2e2b07cbfda222b1176569d61c22055e5556752ffd648426f69687ed1cc203105515e7304c12b915d6270df8e41a4a0e1eaa

2022-08-15 15:43:41 -04:00

32 KiB

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