I tried to move my poor rig to multipool sha256, but it is not as expected.
5 USB erupters with only 1,65GHash/s after 15 minutes hashing BTC on multiport are reporting 8 accepted shares, 2 rejected and 8 hardware errors. Tried moving from eu to us server, tried changing user difficulty from 2 to 1 (cgminer 3.1.1 reports much higher difficulties), no change. Allmost all lines are "stratum from pool X requested work restart". Moving back until someone gives advice for setting small hash miners with sha256 multipool...
Yes, this is a concern. I have both BFL Singles and Block Eruptors running. My BEs run great for FRC, TRC & ZET if I set their Diff to 1 on my Account page. Since BTC is a P2pool it operates differently and species the difficulty. P2pool moves very fast and I'm not sure BEs can keep up.
I feel like I'm getting credit for shares submitted by my BEs, even though my BTC accepts are very low, but I'm not turning off my BFLs to test it.
Flound, can you shed some light on this BE issue in the BTC pool???
The high difficulty should really not matter that much. You will submit fewer shares, but at higher difficulty so your overall shares should be the same. P2pool changed from 10 second blocks to 30 second blocks a month or two ago to help increase the efficiency on ASICs.
I tried re-enabling custom difficulty last night on one of the p2pool nodes. The result?:
Local: 572GH/s in last 10.0 minutes Local dead on arrival: ~23.9% (21-27%) Expected time to share: 33.2 minutes
Shares: 1 (0 orphan, 1 dead) Stale rate: ~100.0% (20-100%) Efficiency: ~0.0% (0-96%) Current payout: 1.5889 BTC
Granted, it looks like we were on TRC most of the night. But efficiency dropped on both p2pool nodes (I'm assuming the high CPU use on this node affected the other one) So custom diff is being turned back off for now.
I hope that the p2pool author will address the efficiency of p2pool soon, there is so much hashrate out there that he could attract if the client ran a little better. Right now we are on it until we hit around 25-30 TH. Then I will switch the pool back to using Stratum for BTC (I'd rather stay on p2pool, but as of now it's really not meant for this application.)
In the meantime, the altcoin profits are more than making up for any perceived loss of income with P2pool. Currently I have a profit of ~0.05371482 BTC over the past 24 hours with my Little Single (~28 GH), which is over 250% what I would have made just mining Bitcoin.
I'm going to work on getting a Profit/MH/Sec and Profit/GH/Sec graph up on the main page so people can see exactly how the multiports are doing, but it requires a little backend work.