On 10/11/2015 8:45 AM, Peter Tschipper wrote:
On 10/11/2015 8:30 AM, Tier Nolan via bitcoin-dev wrote:


On Tue, Nov 10, 2015 at 4:11 PM, Peter Tschipper <peter.tschipper@gmail.com> wrote:
There are better ways of sending new blocks, that's certainly true but for sending historical blocks and seding transactions I don't think so.  This PR is really designed to save bandwidth and not intended to be a huge performance improvement in terms of time spent sending.

If the main point is for historical data, then sticking to just blocks is the best plan.

at the beginning yes.
Since small blocks don't compress well, you could define a "cblocks" message that handles multiple blocks (just concatenate the block messages as payload before compression). 

Small block are rare these days (but plenty of historical block), but still they get a 10% compression, not bad and I think worthwhile and the time it takes to compress small blocks is less that a millisecond so no loss there in time.   But still you have a good point and something worthy of doing after getting compression to work.  I think it's wise to keep it simple at first and build on the success later.
The sending peer could combine blocks so that each cblock is compressing at least 10kB of block data (or whatever is optimal).  It is probably worth specifying a maximum size for network buffer reasons (either 1MB or 1 block maximum).
Good idea. Same answer as above.
Similarly, transactions could be combined together and compressed "ctxs".  The inv messages could be modified so that you can request groups of 10-20 transactions.  That would depend on how much of an improvement compressed transactions would represent.

Good idea. Same answer as above.
More generally, you could define a message which is a compressed message holder.  That is probably to complex to be worth the effort though.
That's actually pretty easy to do and part of the plan.  Sending a cmp_block rather than a block makes it all easier to implement.  It's just a matter of doing pnode->pushmessage("cmp_block", compressed_block); and handling the "cmp_block" command string at the other end.

 

On Tue, Nov 10, 2015 at 5:40 AM, Johnathan Corgan via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
On Mon, Nov 9, 2015 at 5:58 PM, gladoscc via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
 
I think 25% bandwidth savings is certainly considerable, especially for people running full nodes in countries like Australia where internet bandwidth is lower and there are data caps.
​ This reinforces the idea that such trade-off decisions should be be local and negotiated between peers, not a required feature of the network P2P.​
 

--
Johnathan Corgan
Corgan Labs - SDR Training and Development Services

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