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Subject: Re: [Bitcoin-development] 0.8.1 ideas
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On Wednesday, March 13, 2013 5:41:29 PM you wrote:
> I'm not sure I understand the need for hard forks. We can get through this
> crisis by mining pool collusion to prevent forking blocks until there is
> widespread adoption of patched clients.
Anything requiring widespread adoption of patched clients *is by definition* a
hard fork.
> Proposal:
>
> 1) Patch the pre-0.8 branches to support an increased lock count, whatever
> number is required to make sure that this problem never shows up again at
> the current block size (I defer to Luke-Jr and gmaxwell's numbers on this).
This is a hard fork.
The only way to avoid a hard fork is to apply the existing lock limit to all
clients forever. That would be fine, except that pre-0.8 clients cannot reorg
N blocks without dividing that limit by (N * 2) + 1; that leaves us with the
limit of around 1000 locks per block on average. Each transaction uses at
least 3 locks on average (many times more). So about 300 transactions per
block. This is a much smaller limit than the 1 MB we've been assuming is the
bottleneck so far, and the need to increase it is much more urgent - as Pieter
noted on IRC, we are probably already using more than that even ignoring DP
spam. The only reason pre-0.8 clients have survived as well as they have thus
far is because the blockchain has managed to avoid very deep reorgs.
Luke
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