From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1YyxJX-0008T2-Su for bitcoin-development@lists.sourceforge.net; Sun, 31 May 2015 07:05:43 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of petertodd.org designates 62.13.148.107 as permitted sender) client-ip=62.13.148.107; envelope-from=pete@petertodd.org; helo=outmail148107.authsmtp.com; Received: from outmail148107.authsmtp.com ([62.13.148.107]) by sog-mx-4.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1YyxJW-0007md-HQ for bitcoin-development@lists.sourceforge.net; Sun, 31 May 2015 07:05:43 +0000 Received: from mail-c235.authsmtp.com (mail-c235.authsmtp.com [62.13.128.235]) by punt18.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t4V75Xhe040444; Sun, 31 May 2015 08:05:33 +0100 (BST) Received: from muck ([80.123.251.178]) (authenticated bits=128) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t4V75U2s087709 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Sun, 31 May 2015 08:05:32 +0100 (BST) Date: Sun, 31 May 2015 09:05:30 +0200 From: Peter Todd To: Chun Wang <1240902@gmail.com> Message-ID: <20150531070530.GD12966@muck> References: <554BE0E1.5030001@bluematt.me> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="cHMo6Wbp1wrKhbfi" Content-Disposition: inline In-Reply-To: X-Server-Quench: 6da45c4e-0763-11e5-b396-002590a15da7 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aAdMdQMUFVQNAgsB AmMbW1xeUFh7WmE7 YwpPbAdefEhLXhtr V0BWR1pVCwQmRRhn ARt7UFpyfwJBeHc+ ZERgWXYVWhArcUMu RhtJFWoAZnphaTUa TRJbfgVJcANIexZF O1F6ACIKLwdSbGoL NQ4vNDcwO3BTJTpY RgYVKF8UXXNDNDo7 TBNKJjQ9EAUkQS4p IhU9JxYmEV8MM18/ NFYnRUlw X-Authentic-SMTP: 61633532353630.1023:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 80.123.251.178/587 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. X-Spam-Score: -1.5 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_PASS SPF: sender matches SPF record X-Headers-End: 1YyxJW-0007md-HQ Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Block Size Increase Requirements X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 31 May 2015 07:05:43 -0000 --cHMo6Wbp1wrKhbfi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, May 30, 2015 at 07:42:16AM +0800, Chun Wang wrote: > Hello. I am from F2Pool. We are currently mining the biggest blocks on > the network. So far top 100 biggest bitcoin blocks are all from us. We > do support bigger blocks and sooner rather than later. But we cannot > handle 20 MB blocks right now. I know most blocks would not be 20 MB > over night. But only if a small fraction of blocks more than 10 MB, it > could dramatically increase of our orphan rate, result of higher fee > to miners. Bad miners could attack us and the network with artificial > big blocks. As yhou know, other Chinese pools, AntPool, BW, they > produces ASIC chips and mining mostly with their own machines. They do > not care about a few percent of orphan increase as much as we do. They > would continue their zero fee policy. We would be the biggest loser. > As the exchanges had taught us, zero fee is not health to the network. > Also we have to redevelop our block broadcast logic. Server bandwidth > is a lot more expensive in China. And the Internet is slow. Currently > China has more than 50% of mining power, if block size increases, I > bet European and American pools could suffer more than us. We think > the max block size should be increased, but must be increased > smoothly, 2 MB first, and then after one or two years 4 MB, then 8 MB, > and so on. Thanks. Great to hear from you! Yeah, I'm pretty surprised myself that Gavin never accepted the compromises offered by others in this space for a slow growth solution, rather than starting with over an order of magnitude blocksize increase. This is particularly surprising when his own calculations - after correcting an artithmetic error - came up with 8MB blocks rather than 20MB. Something important to note in Gavin Andresen's analysises of this issue is that he's using quite optimistic scenarios for how nodes are connected to each other. For instance, assuming that connections between miners are direct is a very optimistic assumption that depends on a permissive, unregulated, environment where miners co-operate with each other - obviously that's easily subject to change! Better block broadcasting logic helps this in the "co-operation" case, but there's not much it can do in the worst-case. Unrelated: feel free to contact me directly if you have any questions re: the BIP66 upgrade; I hear you guys were planning on upgrading your mining nodes soon. --=20 'peter'[:-1]@petertodd.org 00000000000000000db932d1cbd04a29d8e55989eda3f096d3ab8e8d95eb28e9 --cHMo6Wbp1wrKhbfi Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQGrBAEBCACVBQJVarK3XhSAAAAAABUAQGJsb2NraGFzaEBiaXRjb2luLm9yZzAw MDAwMDAwMDAwMDAwMDAwOGU2ODQwZDUzOWZjMzQwOTgzZTdhMWNlMDBlMTQ2Yjk3 ZjA5MGIwZWYzNzAxNTMvFIAAAAAAFQARcGthLWFkZHJlc3NAZ251cGcub3JncGV0 ZUBwZXRlcnRvZC5vcmcACgkQwIXyHOf0udxTjwf9EYcYDd9ERsa3S8lhB6X5mGVM u5OQ0DjKRpM51M2ITiwwzwkXhEDcbn1YpPJlg5Z9/xdRmrueZQsYsDXxuBoLtVqV Wv+9O/WbW7/4It8rNiF4S1sHDfYSQwNeEozI9vgLw9WT7E3gNWxOp921jiqpey5a dqVRnOT72wL+rmvubcDTmmQ6lUPt99DIsimAc2k9bfZhP7O7bmg/uJx4+Fqiksex 2Tenru0K1dhic/zXufLPIyquoIWbVOcyk20XAi0SbQqouByGEroRaEG9oU3lD6Ho Puoa/Cd9YMoAX5VSenYZYN2X2D3xJOSPb2AVbmLexE2MrFbmsorEIQQ7hiYqHw== =vDwH -----END PGP SIGNATURE----- --cHMo6Wbp1wrKhbfi--