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From: Dave Hudson <dave@hashingit.com>
In-Reply-To: <CAF_2MyXumMsx2nzpoxkGZjXarj6tbAsm+37RwPs-nsi+zaUdGw@mail.gmail.com>
Date: Fri, 7 Aug 2015 16:33:16 -0400
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To: Ryan Butler <rryananizer@gmail.com>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Fees and the block-finding process
Precedence: list


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> On 7 Aug 2015, at 16:17, Ryan Butler via bitcoin-dev =
<bitcoin-dev@lists.linuxfoundation.org> wrote:
>=20
> A raspberry pie 2 node on reasonable Internet connection with a =
reasonable hard drive can run a node with 8 or 20mb blocks easily.
>=20
I'm curious as I've not seen any data on this subject. How fast can a =
RP2 do the necessary cryptographic calculations to validate blocks of =
various sizes?

While everyone tends to talk in terms of 10 minutes per block that is, =
of course, only a typical time and doesn't account for situations in =
which 2 or more blocks are found in quick succession (which, of course, =
happens on a daily basis). At what point does, say, an RP2 node fail to =
be able to validate a second or third block because it's still not =
finished processing the first?

If someone were to be playing games with the system and mining =
transactions without first broadcasting them to the network then how =
long would that take? This would in essence define the ability to DoS =
lower-performance nodes (ignoring all of the other usual considerations =
such as bandwidth, etc).


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 7 Aug 2015, at 16:17, Ryan Butler via bitcoin-dev &lt;<a =
href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" =
class=3D"">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><p dir=3D"ltr" =
class=3D"">A raspberry pie 2 node on reasonable Internet connection with =
a reasonable hard drive can run a node with 8 or 20mb blocks =
easily.</p></div></blockquote>I'm curious as I've not seen any data on =
this subject. How fast can a RP2 do the necessary cryptographic =
calculations to validate blocks of various sizes?</div><div><br =
class=3D""></div><div>While everyone tends to talk in terms of 10 =
minutes per block that is, of course, only a typical time and doesn't =
account for situations in which 2 or more blocks are found in quick =
succession (which, of course, happens on a daily basis). At what point =
does, say, an RP2 node fail to be able to validate a second or third =
block because it's still not finished processing the =
first?</div><div><br class=3D""></div><div>If someone were to be playing =
games with the system and mining transactions without first broadcasting =
them to the network then how long would that take? This would in essence =
define the ability to DoS lower-performance nodes (ignoring all of the =
other usual considerations such as bandwidth, etc).</div><div><br =
class=3D""></div></body></html>=

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