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Fact:
If you're getting 100% rejects with 14-25 shares/minute, then something is wrong with the server or your modem/router is junk.
REAL FACT is if you set it too low, you DDOS the pool...
Let's see what a pool guy says about that.....
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So my suggestion is to aim for a share return rate no higher than the highest difficulty that keeps you at 1% variance if you are setting a "minimum difficulty" or perhaps the value that keeps you under 1.2% for a fixed difficulty. This can be worked out easily if you know your hashrate without even testing it.
So our target is a diff that returns 20-25 shares per minute.
Every 71.6MH/s returns one share per minute - therefore every GH/s returns about 14 shares per minute.
A share return rate of 20 needs a diff of 1 per 1.432GH/s if setting a fixed difficulty.
A share return rate of 25 needs a diff of 1 per 1.79GH/s if setting a minimum difficulty.
Most pools are allowing you to set a fixed diff, so let's keep this final recommendation as simple as possible, and aim for 20 shares per minute. That's a diff of 1 per 1.432GH/s.
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If "you DDOS the pool" with the recommended settings
from one of the guys that wrote cgminer and some of the most stable pools around, then your "pool" isn't a real pool!
im not going to pretend to know everything.. or even care..
all i do know is if i set my diff too low on my s7, like say what you recommend.. which would be around 3000.. it jams up.. completely unresponsive.. have to pull the plug to get it working again..
one thing you have to understand.. we arent mining bitcoin.. we are mining low diff alt coins.. some have difficulty in the 1000s..
with a low diff coin, and a low worker diff, you can crank out 100s of shares a minute.. most will be discarded by cgminer.
all it does is makes the machine work harder.. it also transmits more data, and makes the pool work harder.
on a s9, id probably start around 30k for worker diff..
keep in mind, bitmains cgminer fork has an issue with power of 2.. it causes lots of issues.. so avoid those numbers.. 512,1024,2048,4096,8192, etc..
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