Quick question if you don't mind - I've reached my fill so far today of 'google-fu'
What's your 'main' round? Is it BTC which then (through MM) submits a NMC share, or vice-versa?
The Merge Mine Proxy gets work from both block chains and merges them but when you create a solution it works for both because most of the work you are doing is a MAKE work project.
So because its mostly a "make work" job the two "get works" are allied in such away that the smaller solution works for both chains.
To keep it really simple your share works for both chains.
Thus the diffrenences in reject % is baised on how many shares and rejects occurred in a given round. If you give 1000 shares and have 1 reject that's 0.1%. So lets just say a new round starts for the namecoin block chain and you give 100 more shares on top of the 1000 for bitcoin chain and your get one more reject, then your total shares is 1100 for bitcoin block chain and 2 rejects giving a % of less then 0.2 for BTC and 1% for nmc blockchain.
Example:
rejects | shares given | BTC | NMC |
1 | 100(1%) | 100(1%) | 100(1%) |
1 | 1000(0.1%) | 1000(0.1%) | 100(0%) |
2 | 10000(0.02%) | 10000(0.02%) | 100(1%) |
3 | 20000(0.015%) | 9000(0.01%) | 100(0%) |
The first 2 columns show the rejected and shares given over every round. In the first row we pretend that the rounds for both BTC and NMC started when we started the round and we gave 100 shares with 1 reject you can clearly see the reject rate is the same because the shares are the same for both chains.
In the next row you can assume that a new round started at for NMC at share 900, and no new rejects occurred thus the NMC round has no rejects because it's a new round.
In the 3rd column a new NMC round occurred at share 9900 and between 9900 and 10000 of all shares given to the pool a reject occurred and it counts on the NMC round making the reject rate
SEEM high. Looking at the overall shares given over 10k it's not high because you gave 2 rejected shares over 10,000 shares!
In the final row you can see you have given 20000 shares but a new BTC round occurred at share 11000 but the reject occurred in the BTC round but not the NMC round.
I hope this clears it up.