[Bitcoin-development] Fwd: Block Size Increase Requirements

Yifu Guo yifu at coinapex.com
Mon Jun 1 16:43:38 UTC 2015


 Nielsen's Law of Internet Bandwidth is simply not true, but if you look at
data points like http://www.netindex.com/upload/ which will show we are at
least on the right track, but this is flawed still.

The fact of the matter is these speed tests are done from local origin to
local destination within the city, let alone the country ( see note about
how these test are only conducted 300 miles within the server). and our
current internet infrastructure is set up with CDNs for the web and media
consumption.
these data points can not and should not be used to model the connectivity
of a peer to peer network.

Uplink bandwidth is scarce is China and expensive, avg about $37 per 1mbps
after 5, but this is not the real problem. the true issue lies in the
ISP transparent proxy they run. this is not a problem isolated in just
China, Thailand and various other countries in Asia like Lebanon. I have
also heard in various IRCs that southern France also face this similar
issue due to poor routing configurations they have that prevents
connections to certain parts of the world, unsure if this is a mistake or a
geopolitical by-product.

As for your question earlier Gavin, from Dallas TX to a VPS in Shanghai
on 上海电信/Shanghai telecom, which is capped at 5mbps the data results match
my concerns, I've gotten low as 83 Kbits/sec and as high as 9.24 Mbits/sec.
and other ranges in between, none are consistent. ping avg is about 250ms.

The temporary solution I recommend again from earlier is MPTCP:
http://www.multipath-tcp.org/ which allows you to multiple
interfaces/networks for a single TCP connection, this is mainly developed
for mobile3g/wifi transition but I found uses to improve bandwidth and
connection stability on the go by combining a local wifi/ethernet
connection with my 3g phone tether. this allows you to set up a middlebox
somewhere, put shadowsocks server on it, and on your local machine you can
route all TCP traffic over the shadow socks client and MPTCP will
automatically pick the best path for upload and download.



On Mon, Jun 1, 2015 at 9:59 AM, Gavin Andresen <gavinandresen at gmail.com>
wrote:

> On Mon, Jun 1, 2015 at 7:20 AM, Chun Wang <1240902 at gmail.com> wrote:
>
>> I cannot believe why Gavin (who seems to have difficulty to spell my
>> name correctly.) insists on his 20MB proposal regardless the
>> community. BIP66 has been introduced for a long time and no one knows
>> when the 95% goal can be met. This change to the block max size must
>> take one year or more to be adopted. We should increase the limit and
>> increase it now. 20MB is simply too big and too risky, sometimes we
>> need compromise and push things forward. I agree with any solution
>> lower than 10MB in its first two years.
>>
>>
> Thanks, that's useful!
>
> What do other people think?  Would starting at a max of 8 or 4 get
> consensus?  Scaling up a little less than Nielsen's Law of Internet
> Bandwidth predicts for the next 20 years?  (I think predictability is
> REALLY important).
>
> I chose 20 because all of my testing shows it to be safe, and all of my
> back-of-the-envelope calculations indicate the costs are reasonable.
>
> If consensus is "8 because more than order-of-magnitude increases are
> scary" -- ok.
>
> --
> --
> Gavin Andresen
>
>
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>


-- 
*Yifu Guo*
*"Life is an everlasting self-improvement."*
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