bfgminer/u1 set up - what can I do differently/better? (images)

[sartirious]

I'm a total noob, just got set up with bfgminer and 6 antminer U1s @2GH/s (0981) and I'm a bit confused.

At first, my cumulative hashrate was almost 6Mhash/s but soon it went back down to around 2Mhash/s - which is what I was seeing running a single U1.

I feel like something might be wrong and could use your help - thanks in advance.

E.g., why is AMU 1 so much more active than the others?
I don't know what the 3 different rates next to each AMU signify, but the 3rd one for AMU 1 is way, way higher, and it seems to handle the vast majority of the work...

https://api.spacemonkey.com/v1/s/Gp5GeoAHWetrIk8Y_A25Eg/bfgminer.png

https://api.spacemonkey.com/v1/s/6YJFyl8UXV1OuZqJAH2zZg/pool.png

[Mike_cs]

Hi,
First of all, where do you have them connected? To a HUB? Which one?
If yes, do you use external power supply? How many Volts and Amps does it have?

I've got some problems running mine at 0981. Setting them to 0881 works fine now.

The last of the 3 Values is the effective speed which is the most important.

Mine running at 0881:

Code:

Connected to eu-stratum-lb479kj.btcguild.com diff 2 with stratum as user X
 Block: ...3e3460a8 #283642  Diff:2.19G (15.70Ph/s)  Started: [20:49:01]
 ST:6  F:1  NB:337  AS:0  BW:[ 59/ 53 B/s]  E:22.49  I:51.09uBTC/hr  BS:571k
 3            |  6.29/ 6.02/ 5.37Gh/s | A:68157 R:258+6(.38%) HW:3/.00%
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 AMU 0:       |  1.95/ 2.01/ 1.79Gh/s | A:22651 R: 88+3(.39%) HW:0/none
 AMU 1:       |  2.00/ 2.01/ 1.80Gh/s | A:22749 R: 83+3(.37%) HW:1/.00%
 AMU 2:       |  2.02/ 2.01/ 1.79Gh/s | A:22759 R: 87+0(.38%) HW:2/.00%

[OliRS]

Looking at your screen grab it would appear as though whatever you have the miners plugged into isn't getting enough power. As Mike asks, if you tell us what hub and what volt/amperage it's power supply is rated to it might shine some light on it. If it's a passive hub, i.e. not powered, it's no good.

As an idea, with 6 U1's you should be using a 12V powered USB hub with at least 3A rating, preferably 4A or more. I use Raspberry Pi Model B plugged into a Orico 10 port USB 2.0 powered hub rated at 12V & 4A, I currently have 7 U1's plugged in and a Arctic Breeze USB fan and get a steady 2.0 - 2.1 on all miners. These U1's run pretty hot even on low clock, on high they get too hot too touch unless you have add some cooling, this slows them down. With my fan cooling them they barely even get warm to the touch.

To "fine tune" Bfgminer for the U1's and maximise your return from the pool you could also run it with the "--no-submit-stale" and "--icarus-options 115200:2:2" parameters or add them to your .conf file.

It would also help if you pasted your .conf file (without any info you don't want posted), or perhaps you can make use of mine below. Although you can ignore most of it since I am using api options to work with my Adafruit I2C LCD screen. The most important ones for you are the last 4.

As an example, my .conf file which I use for Slush's Pool is as follows:

Code:

{
"pools" : [
        {
                "url" : "stratum.bitcoin.cz:3333",
                "user" : "User.worker1",
                "pass" : "pass"
        }
]
,
        "api-listen" : true,
        "api-mcast-port" : "4028",
        "api-network" : true,
        "api-port" : "4028",
        "api-allow" : "0/0",
        "expiry" : "120",
        "failover-only" : true,
        "log" : "5",
        "queue" : "3",
        "scan-time" : "60",
        "worktime" : true,
        "shares" : "0",
        "kernel-path" : "/usr/local/bin",
        "scan" : "antminer:all",
        "set-device" : "antminer:clock=x0981",
        "no-submit-stale" : true,
        "icarus-options" : "115200:2:2"
}

I use the 0981 clock speed, 0A81 gives me faster hashing rate but as much as 40% errors so is counterproductive. With the above setup I get literally 0 hashing errors even after many days which I was surprised by.

Hope this helps

Oli.