From: Peter Vessenes <peter@coinlab•com>
To: Mike Hearn <mike@plan99•net>
Cc: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] Reconsidering block version number use
Date: Tue, 24 Jul 2012 17:01:11 +0900 [thread overview]
Message-ID: <CAMGNxUvRXA4y98ojrzQqLhKcYPXM9CUFXKdguQz3iu=jaNvk5w@mail.gmail.com> (raw)
In-Reply-To: <CANEZrP0NMmwWN1U3V_hha7+C8meKWK_szhh+6xP7VQMbFTLoqQ@mail.gmail.com>
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I think it would be great to have more nonce space with less merkle
calculation; keeping track of all possible versions of a block already
takes real RAM, real computation. Being able to change one bit in the
header and send out a new block for checking would ease our pool server
work by a real amount, somewhat on the work generation side, but also on
the checking old work side; we'll have a lot fewer unique transaction /
coinbase sets to hold on to for checking when we get back a solution.
Peter
On Tue, Jul 24, 2012 at 4:58 PM, Mike Hearn <mike@plan99•net> wrote:
> > That'd be 7 bytes of nonce in the block header, which is
> > 72,057,594,037,927,936 ~ 72 petahashes = 72,000 terahashes
> >
> > So: the changes for version 2 blocks would be "has height in the
> > coinbase, and has a 1-byte version number with a 3-byte extranonce."
>
> I don't understand why more nonce bits are necessary. Is it really
> impossible for a multi-core CPU to keep up with the merkle root
> re-calculation and keep an ASIC miner fed, or is this working around a
> performance bottleneck somewhere else?
>
>
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[image: CoinLab Logo]PETER VESSENES
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*peter@coinlab•com * / 206.486.6856 / SKYPE: vessenes
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next prev parent reply other threads:[~2012-07-24 8:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-22 20:52 Luke-Jr
2012-07-23 0:41 ` Gavin Andresen
2012-07-23 0:57 ` Luke-Jr
2012-07-24 7:58 ` Mike Hearn
2012-07-24 8:01 ` Peter Vessenes [this message]
2012-07-24 8:22 ` Mike Hearn
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