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jtoomim

Update required. The p2pool hard fork changes to fix the padding bug have been merged into master. Please update your nodes by doing git checkout master and git pull. I will be moving my hashrate back onto main p2pool later today, and expect the fork to activate within 3 days.

https://github.com ...

jtoomim

We recently encountered a bug on the BCH p2pool. 1/256th of all user addresses will be incorrectly translated into output scripts, and cannot be paid by p2pool. The bug comes from addresses for which the HASH160(pubkey) begins with a leading zero (0x00) -- in this situation, p2pool will submit a ...

jtoomim

I'll leave up ml.toom.im:9327 for now. I might eventually take it down if the RAM consumption gets to be a problem, but I'll try to track you down and let you know. Maybe send me your email address? j at toom dot im

jtoomim

Toomim Bros has shut down its 350 GH/s of LTC p2pool hashrate. We expect this change to be permanent.

We expect to add around 8-9 PH/s of SHA256 hashrate to p2pool soon to replace it. This hashrate will probably be mining BCH, but there's a chance I might do BTC with it instead.

jtoomim

The BTC p2pool forked to version 34 about 1 week ago, on or about July 23rd. Orphan rates have dropped from about 4% to about 0.9%. DOA rates have fallen as well, from 11% to 3.8%. Overall stale share rates dropped by about 3x, and good rate increased from about 85% to 96%.

Network traffic also ...

jtoomim

I've added a couple of beta code branches:

34-memfree:
1. Better stratum job caching -- no longer creates new stratum jobs for different usernames that resolve to the same address. This reduces CPU usage and DOA rates for some nodes, and was necessary to allow many differently-named workers on a ...

jtoomim

The BCH and LTC p2pools have both forked to v34 earlier today. Everything appears to be working so far. BCH has mined two post-fork blocks successfully. LTC hasn't had any blocks yet, but no major problems have been observed.

Old v33 nodes are still connecting to v34 nodes, requesting all of the ...

jtoomim

The "hash must be of length 64" error has been fixed. Do a git pull.

jtoomim

I pushed a few more changes to github master today. I recommend doing a git pull if you're mining BCH. These changes allow for much larger blocks to be mined with P2pool. Once mainnet forks, P2pool will be capable of mining 31.999 MB BCH blocks with tolerable performance on a fast (high GHz) machine ...

jtoomim

A major upgrade has been merged into https://github.com/jtoomim/p2pool (master branch). This upgrade brings many major new features, thanks to rldleblanc:

1. Segwit payout address support on BTC and LTC
2. P2SH support
3. Cashaddr support on BCH
4. Huuuuuuuge performance improvements and stale ...

jtoomim

@OneChain it was because there was a bug with the Antminer S9 firmware that choked as soon as the coinbase transaction reached 8 kB, which happened at around 130 addresses IIRC. Some people wanted to reduce the number of users and payout addresses, so they created their own forked sharechain. Modern ...

jtoomim

No, a p2pool node can set blockmaxweight however it wishes without affecting other nodes on p2pool.

jtoomim

If you run code from https://github.com/jtoomim/p2pool/ branch 1mb_segwit, you're on jtoomimnet.

Yes, setting blockmaxweight=4000000 is recommended, as it will allow you to make full blocks.

jtoomim

Two BTC blocks were mined on Monday. Congrats, p2poolers!

But BTC p2pool currently has an estimated 33% DOA rate! This is extremely high, and indicates a technical problem for one or more of the large miners. My guess is that one of the large miners is using a large number of unique worker ...

jtoomim

Two more AsicBoost BCH blocks have been mined:

https://bch.btc.com/0000000000000000014038d2007fc1586925b76c8c4a4514dc0a3a9020d132ec - version 0x20400000
https://bch.btc.com/00000000000000000216cc2c5e6565072328534b27e8700dca268ce315b84af5 - version 0x20000000

The second one was mined with AsicBoost ...

jtoomim

Asicboost mainnet BCH block mined: https://bch.btc.com/000000000000000004f ... 8948f9de18

jtoomim

I've added dfoderick's changeset for enabling AsicBoost to https://github.com/jtoomim/p2pool/commits/with_df_ab. It seems to work okay on BCH testnet, so I'm testing it now on BCH mainnet. Assuming it works, once it has mined a few blocks, I'll merge it into 1mb_segwit.

Note: if anyone on BCH is ...

jtoomim

Yeah, my BCH p2pool server is hosted in Moses Lake. Looks like your server is up now, and pool-wide average orphan rates are way down.

Your username is amusing, btw. Is that one of your main financial motivations for mining?

I'm looking back through your shares, and it seems like all of your ...

jtoomim

Re: 557870: Thanks for the heads up. I had forgotten that I had been doing some bitcoind development on server computer while my hashrate was off on pool.bitcoin.com, and was running buggy incomplete code. I fixed this on Wednesday shortly after that orphan block was found.

On another note: Someone ...

jtoomim

I have put my hashrate back on BCH p2pool.

jtoomim

I have removed my hashrate from the BCH p2pool, and I will be keeping my hashrate off of BCH p2pool for the duration of the BCH hard fork. I suggest everyone else do the same. Consider BCH p2pool support deprecated for the time being; we will resume activity on BCH when things settle down.

If ...

jtoomim

It looks like Bitmain's firmware now supports the BIP310 stratum extension for overt asicboost. This should make implementation much easier.

If anyone wants to work on this, the 3 BCH bounty for it is still valid. I can also pay in BTC or LTC if anyone prefers.

jtoomim

imaginary_username mined a BCH testnet block with the new (ABC) rules. The coinbase transaction was 226 bytes, even though there was only one active payout address, due to the OP_RETURN and the donation address, so I'm convinced that we don't have to worry about the 100 byte minimum.

In other news ...

jtoomim

The pull request for adding P2SH, BECH32, SegWit address, and Cashaddr support to p2pool appears to be complete. I'm reviewing it now.

https://github.com/jtoomim/p2pool/pull/14

jtoomim

Did anyone get to order any machines from the Ebang E11 series? I'd love to be able to test one to make sure it's compatible with p2pool, but they were sold out before I could grab one.

http://miner.ebang.com.cn/index.html

P2pool has not been tested with the Bitcoin ABC Nov 15 fork yet, but I do ...

jtoomim

Can you be more specific about which next-gen miners using ASICBOOST you're talking about? I have an m10v2 running on p2pool right now with no problems at 63 J/TH. Is there anything more next-gen than that?

As far as I know, it was just the Halong Dragonmint T1 that required ASICBOOST, and it wasn ...

jtoomim

A 225 amp circuit breaker tripped at our facility, knocking off both of our sha256 p2pool servers for about 6 hours. Fixed.

jtoomim

rldleblanc has submitted a PR to jtoomim/p2pool 1mb_segwit which will add SegWit address support to p2pool for coins that support it (e.g. BTC, LTC). This PR is based on the Vertcoin p2pool's code. Adding this support will be a hard fork, and will require all users to upgrade before it can be used ...

jtoomim

It appears there is a bug with the caching of the value of the serialized size for each transaction, at least on BCH. This is causing share verification to be way slower than it ought to be. I'm looking into a proper fix now, but for the mean time, you can change this line in p2pool/data.py:540 ...

jtoomim

I'm currently losing about 20% of my hashrate on p2pool. It looks like p2pool is taking about 3 seconds on average to process a 3-6 MB getblocktemplate response and generate new work. During that time, p2pool appears to not process or respond to stratum requests from my mining hardware. This problem ...

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