1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
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 <keziahw@gmail.com>) id 1XCy6q-0002Ri-CX
for bitcoin-development@lists.sourceforge.net;
Thu, 31 Jul 2014 21:42:00 +0000
Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of gmail.com
designates 209.85.219.44 as permitted sender)
client-ip=209.85.219.44; envelope-from=keziahw@gmail.com;
helo=mail-oa0-f44.google.com;
Received: from mail-oa0-f44.google.com ([209.85.219.44])
by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128)
(Exim 4.76) id 1XCy6p-0007fF-B5
for bitcoin-development@lists.sourceforge.net;
Thu, 31 Jul 2014 21:42:00 +0000
Received: by mail-oa0-f44.google.com with SMTP id eb12so2498249oac.3
for <bitcoin-development@lists.sourceforge.net>;
Thu, 31 Jul 2014 14:41:53 -0700 (PDT)
X-Received: by 10.60.45.140 with SMTP id n12mr1537418oem.48.1406842913920;
Thu, 31 Jul 2014 14:41:53 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.202.61.195 with HTTP; Thu, 31 Jul 2014 14:41:33 -0700 (PDT)
In-Reply-To: <CAAS2fgS-KiP-tiy91Ah2hJ0pepA0OJDCG+Bv+redFtsqrUTevQ@mail.gmail.com>
References: <CA+iPb=EaX=bvOjNtZ+LnYTMRLQQ9nFcrefAkBdv8eActoX_b8A@mail.gmail.com>
<CABsx9T2PSa3MpfMMDCb8ACVF5vDOZOFLEK9zfP9PakgHA4U16w@mail.gmail.com>
<CAPkFh0vKFnKRE-sd-Z9t1zB73VLPsiaQ3o=OYgBqqtUE4_rTaw@mail.gmail.com>
<CA+iPb=GC7iw1LP6boyfX22oMO2k2=YcAuRhE0E3OzzJHYapsow@mail.gmail.com>
<CAAS2fgS-KiP-tiy91Ah2hJ0pepA0OJDCG+Bv+redFtsqrUTevQ@mail.gmail.com>
From: Kaz Wesley <keziahw@gmail.com>
Date: Thu, 31 Jul 2014 14:41:33 -0700
Message-ID: <CA+iPb=Fa4YSTjPuCfyWy0wB2XBV=Mi99G3Hb84gjy+muNDin+g@mail.gmail.com>
To: Gregory Maxwell <gmaxwell@gmail.com>
Content-Type: text/plain; charset=UTF-8
X-Spam-Score: -1.6 (-)
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
(keziahw[at]gmail.com)
-0.0 SPF_PASS SPF: sender matches SPF record
-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
X-Headers-End: 1XCy6p-0007fF-B5
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Squashing redundant tx data in blocks on
the wire
X-BeenThere: bitcoin-development@lists.sourceforge.net
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: <bitcoin-development.lists.sourceforge.net>
List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>,
<mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe>
List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development>
List-Post: <mailto:bitcoin-development@lists.sourceforge.net>
List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help>
List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>,
<mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe>
X-List-Received-Date: Thu, 31 Jul 2014 21:42:00 -0000
> the need to have transmitted the transaction list [..] first
32 bits per transaction is at least double the communication overhead
of the simple approach, and only offers a bound on the probability of
needing a round trip.
On Thu, Jul 31, 2014 at 2:29 PM, Gregory Maxwell <gmaxwell@gmail.com> wrote:
> On Thu, Jul 31, 2014 at 1:47 PM, Kaz Wesley <keziahw@gmail.com> wrote:
>> trip to request the missing tx; if we could somehow get the "What's
>> the Difference" approach to effectively operate on full transactions
>> instead
>
> I explain how to do this on the network block coding page.
>
> Given that you know the sizes and orders of the transactions (e.g.
> from a reconciliation step first), the sender sends non-syndromic
> forward error correcting code data somewhat larger than their estimate
> of how much data the user is missing. Then you drop the data you know
> into place and then recover the missing blocks using the fec.
>
> There is no overhead in this approach except for FEC blocks that are
> incompletely missing (and so must be completely discarded), and the
> need to have the transmitted the transaction list and sizes first.
> (note, that just more bandwidth, not an additional round trip).
|
