DiabloMiner on Dual 6990 + 64Bit Ubuntu, Second GPU not working. Advice?

[SourceJ]

Hello All,

I am running dual 6990s on Ubuntu 10.10 Server 64bit with SDK 2.4 and Catalyst 11.5. I have issues with startx and running the GPU mining program. Currently I am only getting ~400MH/s when running an instance of Diablo miner, which supossudly is using both GPUs(Cayman 0 and 1). However, I do not think that the second GPU is operating correctly. I ssh into the rig as it is at a remote location.

Any configuration tips?

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[mf]

DiabloMiner uses the -D option to specify which device it should use.

I do not have two GPUs so take my advice with a grain of salt... but,

Have you tried running *two* instances of the DiabloMiner, one with -D 1 (for the first GPU) and one with -D 2 (for the second GPU)?

[SourceJ]

When I specify -D 1 and -D 2, I only get 200Mh/s for each. I believe that the 1 and 2 for my devices refer to each of the two cores of the first GPU, because the numbers are just too low for them to be both running. When I run aticonfig --adapter=0,1 --od-gettemperature I get different temperatures, leading me to think otherwise.

I feel that if the 2nd GPU is enabled, then there should be 4 cores running, but only two are showing up. Is the khash/s calculation of DiabloMiner accurate?

I have tried installing different driver editions, and checked my xorg.conf file to make sure it is correct, but I just cannot get the speeds to increase. Dual 6990s should be running atleast at 800Mhash/s, but mine are half of that.

Any ideas? I can post any necessary print outs from my prompts.

I ssh into my machine btw, could it be an issue with the lack of a display?

[SourceJ]

A quick lspci | grep ATI gave me this output, which I find odd.

05:00.0 VGA compatible controller: ATI Technologies INc Device 671d
05:00.1 Audio device: ATI Technologies Inc Device aa80
06:00.1 Display controller: ATI Technologies Inc Device 671d
06:00.1 Audio device: ATI Technologies Inc Device aa80

Could my drivers be detecting my 2nd GPU as an audio device or something similar? I do not think that the 2nd 6990 is even being detected..

[SourceJ]

Bump,

Someone please, help me out on this. I have been trying for 5 days to get this setup working. I'll send 1 BTC to whoever can give me some useful advice.

[mf]

I run my DiabloMiner inside a tmux session (same as screen, but better).
I have to always export DISPLAY=:0.0 before launching a new session if I create a new tmux window.

There is a fairly complete guide about DiabloMiner here: http://forum.bitcoin.org/?topic=3356.msg47489#msg47489

If you have Crossfire, you should allegedly turn that *off*: http://forum.bitcoin.org/index.php?topic=7167.msg105782#msg105782

Check what the env var $COMPUTE is, as when that is set it supersedes $DISPLAY for ATI computation.

https://en.bitcoin.it/wiki/Mining_hardware_comparison only lists other miners for the 6990, not DiabloMiner.

Hope anything above helped...

[Sottilde]

I have heard a few success stories with GuiMiner for Windows - I know the hate for Windows but you should be getting ~375MH/s per GPU, so about 1500MH/s total - maybe it's enough to make a compromise.