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Author Topic: Discontinued: Lancelot (Heavy Duty 400 Mega hashes, 2 x FPGA Mining Board)  (Read 86199 times)
elchorizo
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May 30, 2013, 08:39:32 PM
 #761

First need fix my problem run all Lancelots, after more pics.

I could help you if you were running Linux but not Windows, sorry.

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May 30, 2013, 08:41:31 PM
 #762

He's got us like a girl with nudes

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chanberg
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May 30, 2013, 08:46:43 PM
 #763

He's got us like a girl with nudes

LOL, he does
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May 30, 2013, 08:52:06 PM
 #764

Let us see the goodies key

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jimmy3dita
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May 30, 2013, 09:08:41 PM
 #765

News from the front: the V42 firmware with this boards is AWESOME, I'm getting 15% more work with the same setup!!

Unfortunately the (survived) 10A PSUs are running too hot while pulling 136 watt from the wall, and I can see some instabilities and more HW errors if I plug more than 3 Lancelots to one single PSU.

Next step: buy a "metal+fan" PSU (lot of them on Ebay, they are used for led strips) and while I'm there try to grab some better fans (one of them is almost gone).

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May 30, 2013, 09:15:09 PM
 #766

News from the front: the V42 firmware with this boards is AWESOME, I'm getting 15% more work with the same setup!!

Unfortunately the (survived) 10A PSUs are running too hot while pulling 136 watt from the wall, and I can see some instabilities and more HW errors if I plug more than 3 Lancelots to one single PSU.

Next step: buy a "metal+fan" PSU (lot of them on Ebay, they are used for led strips) and while I'm there try to grab some better fans (one of them is almost gone).

Jimmy

Link the PSU in here if you don't mind once you pick them up.

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May 30, 2013, 09:49:30 PM
 #767

Another question. What is the formula for converting from WU/m to MH/s / GH/s?

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May 30, 2013, 10:19:22 PM
 #768

Another useful indication: the "--icarus-timing short" gives me the following code:

Code:
Icarus 6 Re-estimate: Hs=8.738163e-10 W=5.903921e-01 read_count=42 fullnonce=4.343s

and never dropping below 5 seconds for the other boards.

if it's true, and if I don't melt the PSUs, the potential of the Blackarrow boards is higher than expected!

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kano
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May 31, 2013, 12:01:59 AM
 #769

Another question. What is the formula for converting from WU/m to MH/s / GH/s?
(WU * (2 ^32) / 60) H/s
However, that is indeed hashes, not pool accepted work
... and of course give it a few hours at least ...

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kano
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May 31, 2013, 12:20:53 AM
 #770

Another useful indication: the "--icarus-timing short" gives me the following code:

Code:
Icarus 6 Re-estimate: Hs=8.738163e-10 W=5.903921e-01 read_count=42 fullnonce=4.343s

and never dropping below 5 seconds for the other boards.

if it's true, and if I don't melt the PSUs, the potential of the Blackarrow boards is higher than expected!
Yet again, if you are using the V42 bitstream, you cannot get reliable timing.
V42 adjusts the clock speed and I can't ask the device for the clock speed.

As long as the fullnonce time is less than the max clock speed, it will hash at the maximum performance.
However if you set it too low, it will have to generate more work per result ... e.g. setting it down to 10 or 20 would be too low
(10=1s 20=2s)

The point of the timing is 2 things:
1) Important: that it aborts work before it is idle (if it doesn't find a result)
2) (Not really important:) that it shows the correct MH/s

So as long as the fullnonce number is below (but not too far below) the maximum hardware performance, you will get the max possible shares you can.

There is a reason why the timing works the way it does.
It does a line of best fit through a set of points (and also ignores end case points)
The original problem was that I was dealing with serial-USB time results to determine a picosecond accuracy calculation.
Have a look at the 400MH/s results and you may be surprised (as I was when I wrote it) how accurate the estimate is.
Each individual result varies by enough to make it not possible to determine the clock speed of that single result - that's basically using the result to determine the result - so yeah that's not possible either Smiley
So how it works at the moment requires a static clock (which the V42 doesn't have)

There is one change I'll probably add soon and that is allow short=N (or long=N) to set an upper limit on N so although it wont be as close as possible to the 'best' timing to minimise the amount of work generated, it will allow you to ensure N stays below a limit but it can still report Re-estimates to see how fast it 'thinks' it is hashing

Bottom line with V42:
Let it run for a few days and then look at accepted shares - to see how fast it is really hashing.
(and using --icarus-timing 2.0=75 will allow up to 572MH/s)
I you really think it can go at higher clocks, then you need to replace 75 with a lower number.
to convert 75 to a MH/s limit you simply: 2^32 * 10 / 75

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blackarrow
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May 31, 2013, 03:24:18 AM
 #771

First need fix my problem run all Lancelots, after more pics.

Suggestion: buy few raspberry pi for controlling the Lancelot boards.

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May 31, 2013, 03:26:19 AM
 #772

Just wanted to let everyone know that these fans make a perfect replacement: http://www.amazon.com/gp/product/B00006B8CM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

We've used different fans in the last batch (3). Let us know if there are issues with them.

We manufacture Bitcoin ASICs and Bitcoin mining equipment.
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setkeh
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May 31, 2013, 07:49:49 AM
 #773

Will do Cheesy

Mine are still in hong kong but once there on the plane wont take long Cheesy

Ill also be running mine of a Rpi and a 10 Port hub Cheesy
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May 31, 2013, 01:52:52 PM
 #774

Try the latest cgminer 3.2.0 released today
https://bitcointalk.org/index.php?topic=28402.0

It auto detects everything, auto sets the settings and just runs (No -S options and no --icarus-timing required)
On linux it's rock solid - on windows let us know how it goes Smiley
Any problems, please report.

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FlappySocks
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May 31, 2013, 01:54:48 PM
 #775

Great.

Is now a good time to switch to V42?

Do I need this http://www.ebay.co.uk/itm/Xilinx-Platform-USB-Download-Cable-Jtag-Programmer-for-FPGA-CPLD-C-Mod-XC2C64A-/261218343149?pt=UK_Computing_Other_Computing_Networking&hash=item3cd1d398ed ??
jimmy3dita
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May 31, 2013, 04:40:42 PM
 #776

git cloned
compiled for Pi

now under testing

Hotplug is fantastic (by now I'm running with super user, then I'll work on permissions) BUT I still see orange leds blinking, so the units are randomly idle.

How do I set shorter timings?

Thanks Smiley

P.s.
pics of the new PSU incoming Smiley

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turtle83
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May 31, 2013, 04:52:37 PM
 #777

git cloned
compiled for Pi

now under testing

Hotplug is fantastic (by now I'm running with super user, then I'll work on permissions) BUT I still see orange leds blinking, so the units are randomly idle.

How do I set shorter timings?

Thanks Smiley

P.s.
pics of the new PSU incoming Smiley

https://bitcointalk.org/index.php?topic=216117.0 <-- in case you want precompiled binaries... planing to setup a repo for pi..

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May 31, 2013, 05:45:52 PM
 #778

Blackarrow,

Have all of the tracking numbers been sent? I haven't received mine yet.
Pistachio
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May 31, 2013, 05:46:39 PM
 #779

Try the latest cgminer 3.2.0 released today
https://bitcointalk.org/index.php?topic=28402.0

It auto detects everything, auto sets the settings and just runs (No -S options and no --icarus-timing required)
On linux it's rock solid - on windows let us know how it goes Smiley
Any problems, please report.

Sweet  Cheesy, will try this when I get home. Just got a Jtag kit in the mail will try before and after switching to v42. Thanks,
FlappySocks
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May 31, 2013, 06:02:33 PM
 #780

Just got a Jtag kit in the mail will try before and after switching to v42. Thanks,

Which Jtag kit did you get?
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