From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 3B92991A for ; Sat, 22 Aug 2015 00:01:35 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail149055.authsmtp.co.uk (outmail149055.authsmtp.co.uk [62.13.149.55]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 76822FE for ; Sat, 22 Aug 2015 00:01:34 +0000 (UTC) Received: from mail-c235.authsmtp.com (mail-c235.authsmtp.com [62.13.128.235]) by punt17.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t7M01XMx065442; Sat, 22 Aug 2015 01:01:33 +0100 (BST) Received: from muck (S0106e03f49079160.ok.shawcable.net [174.4.1.120]) (authenticated bits=128) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t7M01Sn7049195 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Sat, 22 Aug 2015 01:01:31 +0100 (BST) Date: Fri, 21 Aug 2015 17:01:27 -0700 From: Peter Todd To: Tom Harding Message-ID: <20150822000127.GA5679@muck> References: <55D5AA8E.7070403@bitcoins.info> <55D67017.9000106@thinlink.com> <20150821003751.GA19230@muck> <55D7575B.6030505@thinlink.com> <20150821222153.GD7450@muck> <55D7B157.904@thinlink.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="YiEDa0DAkWCtVeE4" Content-Disposition: inline In-Reply-To: <55D7B157.904@thinlink.com> X-Server-Quench: f25065a0-4860-11e5-b398-002590a15da7 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aAdMdAAUGUATAgsB AmMbW1VeUFx7WmE7 ag1VcwFDY1RPXQV1 VUBOXVMcUAIVAR1i WBkeVhBzfgAIfnp5 Ywg0XHVbWkErdVt5 SkhUCGwHMGJ9OmMW WF1YdwFReQMbfxoR O1cxNiYHcQ5VPz4z GA41ejw8IwAXBDVT SwQMJlsWRVdDNTk6 WwoFGTEiEQUvRjk4 KB0gYnQYG00Sen4z I1ZpfFsIezQbEmUA X-Authentic-SMTP: 61633532353630.1023:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 174.4.1.120/587 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: bitcoin-dev@lists.linuxfoundation.org Subject: Re: [bitcoin-dev] Dynamically Controlled Bitcoin Block Size Max Cap X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Aug 2015 00:01:35 -0000 --YiEDa0DAkWCtVeE4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Aug 21, 2015 at 04:16:39PM -0700, Tom Harding wrote: > On 8/21/2015 3:21 PM, Peter Todd wrote: > > To use a car analogy, Pieter Wuille has shown that the brake cylinders > > have a fatigue problem, and if used in stop-and-go traffic regularly > > they'll fail during heavy braking, potentially killing someone. You've > > countered with a study of highway driving, showing that if the car is > > only used on the highway the brakes have no issues, claiming that the > > car design is perfectly safe.=20 >=20 > No. If we must play the analogy game, it was found that the car crashes > when the brakes are bad (minority hash power partitioned) the radio is > on (partitioned miners had small individual hashrate). >=20 > I checked the scenario where only the radio is on, and found the car > does not crash. Incidentally, what's your acceptable revenue difference between a small (1% hashing power) and large (%30 hashing power) miner, all else being equal? (remember that we shouldn't preclude variance reduction techniques such as p2pool and pooled-solo mode) Equally, what kind of attacks on miners do you think we need to be able to resist? E.g. DoS attacks, hacking, etc. That would let me know if you're definition of "the brakes are bad" corresponds to normal usage, or something that's not reasonable to design for. --=20 'peter'[:-1]@petertodd.org 00000000000000000402fe6fb9ad613c93e12bddfc6ec02a2bd92f002050594d --YiEDa0DAkWCtVeE4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQGqBAEBCACVBQJV17vUXhSAAAAAABUAQGJsb2NraGFzaEBiaXRjb2luLm9yZzAw MDAwMDAwMDAwMDAwMDAwNDAyZmU2ZmI5YWQ2MTNjOTNlMTJiZGRmYzZlYzAyYTJi ZDkyZjAwMjA1MDU5NGQvFIAAAAAAFQARcGthLWFkZHJlc3NAZ251cGcub3JncGV0 ZUBwZXRlcnRvZC5vcmcACgkQwIXyHOf0udxNPwf1GmKP0EQJiEqJA+4OMyYv0eoG FcuyUL55hxuIaT20ccPqAYM3AWPfkhMdWbUqoX2uNVFLzdAOh6NVqY5Fmjo0sXuB uceLdO1HeBO1V//OwejV4eJ3jzvQvZLgkL7agDbwnc4PDcD5JKAG6oumFLe8utoe vcPqIyuj2H7XjTCSngLZq9APeF1u3s/J6/wQ76pl6vuVxw9pGXhjkY/v8MWXe/Pf OAOQakwMij/G476qhXFuP+3rQSNK2tJSD2gx5ZCavBwSYcBB+qtBAwETKAlRFRdS KRxC3Qm+6EIprYj0OBoZLUiCSnPUYuxsQpSUiXEaPpdpsQspKYu0icoIM8nW =+CC1 -----END PGP SIGNATURE----- --YiEDa0DAkWCtVeE4--