Quote from: Doff on November 08, 2013, 05:19:03 AM

Quote from: cypherdoc on November 08, 2013, 05:10:03 AM

thanks for the pic taco.

i really don't get this. i've got stable speeds right now around 550 GH/s in the BF GUI yet my stratum pool monitor shows btwn 78.8 and 193 GH/s. it's been consistently showing this disparity.

problem is that my Avalons show consistently accurate readings on this same stratum pool monitor of 82-84 GH/s and in its cgminer GUI.

Did you adjust the Difficult for the BF? Just a thought not sure if it helps.

+1

Chainminer/bitfury boards seem to be very sensitive to low diff work. Lots of low diff shares get queued up and the miner falls behind (polling the chips sequentially) and can't submit fast enough.

My preferred pool/s use variable difficulty and this can also be a problem. The pool will increase diff but the miner is left submitting (or proxy is rejecting) shares that are below target and can take a long time for the pool to climb to a useful diff.

To work around this, on reboots, I restart chainminer every couple of minutes (which seems to purge the queue) until it reaches the desired diff. Two to three times usually does it.

However, note that it can still be an issue if the pool changes the diff frequently. If it lowers, the miner is left submitting old shares of a higher diff for a short delay which, while valid, aren't counted/rewarded appropriately. If it raises they get rejected as below target temporarily. Approx once a month I've checked on my miner only to find its thrashed itself back down to minimum diff shares and the pool reporting ~1GH/s. Normally it will avg same as bitfury web.

If your pool supports setting diff target, rough guidance would be ~1 per GH. eg. full rig 512 diff.

Does anyone else have similar experiences with vardiff pools?... I don't believe there is a way in stratum for miner/proxy to 'request' a given difficulty from the pool.