Advise For VarDiff Settings (SHA256)

[daygle]

Hi,

I'm not totally happy with the variable difficulty setup on my pool and I guess I'm after some advise here. I have setup the following NOMP settings on a SHA256 pool.

My aim is for miners to be assigned difficulty per their miner size - 1GH/s miner = diff 1, 256GH/s miner would receive diff of 256.

Here are my settings:-

"ports": {
"3333": {
"diff": 32,
"varDiff": {
"minDiff": 1,
"maxDiff": 4096,
"targetTime": 5,
"retargetTime": 90,
"variancePercent": 30
}
},

Advise from others would be much appriciated.

[fedaykinofdune]

I've dealt with mostly scrypt coins up to this point so I may be completely wrong here, but I don't think SHA256 vardiff is going to work very well like that. Anyway, what I usually do with all my coins is have a vardiff port ranging 8-4096, then several fixed-diff ports, going in order from 8, 16, 128, 256, 512, 1024, and so on. For a production pool, I've found that people mining with ASIC's and other rentals really like it and it brings me more hashes. Some of the rentals out there won't even run unless they can hook up to a certain diff, so I try to make accommodation for them. But yeah, I would suggest leaving your vardiff as is and add in some extra fixed diff ports. Here's a snip of one of my scrypt coin configs for example:

"ports": {
        "3002": {
            "diff": 16
        },
        "3001": {
            "diff": 32,
            "varDiff": {
                "minDiff": 8,
                "maxDiff": 4096,
                "targetTime": 15,
                "retargetTime": 90,
                "variancePercent": 30
            }
        },
        "3003": {
            "diff": 256
        },
        "3004": {
             "diff": 512
        },
        "3005": {
             "diff": 1024
        },
        "3006": {
             "diff": 1536
        },
        "3007": {
             "diff": 2048
        },
        "3008": {
             "diff": 3072
        },
        "3009": {
             "diff": 4096
        }
    },

[daygle]

Thanks fedaykinofdune! Really good advise, in fact I already had the alternate ports as you mentioned. I have modified my scrypt pools simular to your variable difficulty settings.

Saying that I still would like advise from users running SHA256 pools, I'm almost sure that variable difficulty under 8 would be setup on SHA256 pools using NOMP.

[sigwo]

I only use VARDIFF and set min 8 max 45000 on scrypt to support high
hashpower rigs.

On Wed, Aug 13, 2014 at 11:40 PM, Glen notifications@github.com wrote:

Thanks fedaykinofdune! Really good advise, in fact I already had the
alternate ports as you mentioned. I have modified my scrypt pools simular
to your settings.

Saying that I still would like advise from users running SHA256 pools, I'm
almost sure that difficulty under 8 would be setup on SHA256 pools using
NOMP.

—
Reply to this email directly or view it on GitHub
#356 (comment)
.

[daygle]

Thanks sigwo,

Any SHA256 pool owners out there?

[scorpio18]

This is my scrypt and sha256 settings

"ports": {
"3418": {
"diff": 256,
"varDiff": {
"minDiff": 8,
"maxDiff": 4096,
"targetTime": 15,
"retargetTime": 90,
"variancePercent": 30

but you can start tow vardiff ports ,one for the big rigs and 1 for the small rigs, so the second will be like this

"ports": {
"3418": {
"diff": 8,
"varDiff": {
"minDiff": 1,
"maxDiff": 1024,
"targetTime": 15,
"retargetTime": 90,
"variancePercent": 30