Quote from: bolehvpn on October 14, 2014, 02:22:55 AM

Ugh my hash rate is fluctuating wildly... even with the latest firmware.

On the miner it reports all is well but it either hashes at only 1.7 gh as reported on the pool or it drops to a few gh and then goes up crazily then drops down again.

Is this normal?

Sounds like you haven't read back through around page 32 - 33 of this topic in which

Quote from: ckolivas on October 09, 2014, 01:18:43 PM

Quote from: dkaufman on October 09, 2014, 01:36:35 AM

Thanks, that's all anyone can ask!

Fudged my way through a cross compile, wedged shit in here and there, patched stuff, moved stuff around, can't remember what I did, but here's a binary:

http://ck.kolivas.org/apps/cgminer/antminer/s4/4.6.1-141009/cgminer

I have no idea if it really is for the right architecture, where you stick it on their filesystem or what to make it work or if it will just explode in a ball of flames, but there it is.

If you haven't already, you need to ssh into your S4, download that patched cgminer binary from the link, and replace the /usr/bin/cgminer that shipped with the machine (version 3.6.x) or that you got from the first S4 firmware update on bitmain's site (which was 4.6.1, but not with these vardiff fixes).

It fixes a problem in which the underpowered S4 controller board can't keep up with the pool software rapidly adjusting its difficulty upward when you first join a pool. This, combined with using a pool which lets you set your worker's minimum difficulty ~ 2048 (i've been using 2250, as my S4 is slightly overclocked) has finally allowed my S4 to attain its "guaranteed 2TH" rate on my preferred pool (Slush's, which just added back the minimum diff setting in response to this issue).

Some are saying you don't need that patch, that bitmain has updated the firmware on their site (but changing the contents of the tarball they already had up there, without changing the date in the file name, just seems a little squirrely to me). Others seem to be saying that using a pool with a min-diff setting ~ 2048 obviates the need for Con's updated / customized version of the cgminer code, but that was not my experience. I hadn't seen my S4 operate with a stable 2TH hash rate on any pool until I had both the updated cgminer running and a pool that let me set the diff to 2048.

So ymmv but thats been my experience. Now back to watching youtube videos about how to install hot air ducts to deliver the hot air from the miners in the basement up to the rest of the house. It's getting COLD in northeastern PA!

thanks,

-dave