From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Yz9ES-0005Nc-CX for bitcoin-development@lists.sourceforge.net; Sun, 31 May 2015 19:49:16 +0000 Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.215.52 as permitted sender) client-ip=209.85.215.52; envelope-from=gavinandresen@gmail.com; helo=mail-la0-f52.google.com; Received: from mail-la0-f52.google.com ([209.85.215.52]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1Yz9EO-0001Mb-EL for bitcoin-development@lists.sourceforge.net; Sun, 31 May 2015 19:49:16 +0000 Received: by laei3 with SMTP id i3so295387lae.3 for ; Sun, 31 May 2015 12:49:06 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.112.166.37 with SMTP id zd5mr17416024lbb.75.1433101746038; Sun, 31 May 2015 12:49:06 -0700 (PDT) Received: by 10.25.90.75 with HTTP; Sun, 31 May 2015 12:49:05 -0700 (PDT) In-Reply-To: <1433079085.5422.10.camel@yahoo.com> References: <554BE0E1.5030001@bluematt.me> <1433079085.5422.10.camel@yahoo.com> Date: Sun, 31 May 2015 15:49:05 -0400 Message-ID: From: Gavin Andresen To: gb Content-Type: multipart/alternative; boundary=001a11c382d07feeb00517660045 X-Spam-Score: -0.6 (/) 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 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (gavinandresen[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 1.0 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 AWL AWL: Adjusted score from AWL reputation of From: address X-Headers-End: 1Yz9EO-0001Mb-EL Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] [Bulk] Re: Fwd: 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 19:49:16 -0000 --001a11c382d07feeb00517660045 Content-Type: text/plain; charset=UTF-8 On Sun, May 31, 2015 at 9:31 AM, gb wrote: > Aren't you calculating bandwidth for a singly-connected node? A "highly > connected" miner could have 30-100 node connections so you probably need > to increase your traffic estimates by that factor. > > I.e. For 100MB blocks, 30-100 Mbps and $60-$100 per day data costs. > No, randomly connected gossip networks (which is what the Bitcoin p2p network is) don't work that way, bandwidth is (roughly) O(N) where N is the number of bytes relayed to everybody. (it is actually a small multiple of N, because of the overhead of 'inv' messages, and if we ever get really serious about scaling up we'll need to fix the protocol to reduce that overhead, but that won't be a problem for years). -- -- Gavin Andresen --001a11c382d07feeb00517660045 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On S= un, May 31, 2015 at 9:31 AM, gb <kiwigb@yahoo.com> wrote:
=
Aren't you calculating bandwidth for a singly-connected no= de? A "highly
connected" miner could have 30-100 node connections so you probably ne= ed
to increase your traffic estimates by that factor.

I.e. For 100MB blocks, 30-100 Mbps and $60-$100 per day data costs.

No, randomly connected gossip networks (which is w= hat the Bitcoin p2p network is) don't work that way, bandwidth is (roug= hly) O(N) where N is the number of bytes relayed to everybody.

(it is actually a = small multiple of N, because of the overhead of 'inv' messages, and= if we ever get really serious about scaling up we'll need to fix the p= rotocol to reduce that overhead, but that won't be a problem for years)= .


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Gavin Andresen
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