bfgminer: 100% CPU usage on nVidia GPUs, ~0% on AMD GPUs?

[salfter]

I noticed a difference in CPU load and was wondering if it's normal.  The boxes with nVidia GPUs (two 9500GTs and a GT210) show full usage on one core while mining.  By comparison, the new mining box I set up with a Radeon HD 7750 has almost no CPU usage while pushing a much higher rate (~3.5 MH/s for the GT210, ~6 MH/s each for the 9500GTs, ~133 MH/s for the 7750).  What would account for this discrepancy?

I'm running the most recent bfgminer on all machines, with the diablo kernel.  All but one are running 64-bit Gentoo Linux.  One of the 9500GTs is in my office computer, which runs 32-bit Windows XP SP3; CPU load on it behaves the same way as on the Linux boxen.  Intensity is set to dynamic on all but the new mining box; on the mining box, it's set to 11.  CPUs are a mix of Core 2s and Athlon 64s.

I know that nVidia GPUs are suboptimal for mining, but they're what I have. Two of them are in boxes that serve as MythTV frontends, and nVidia has in the past provided better support for video decoding. I haven't given VAAPI (?) a shot on the 7750 yet; if it's working as well with MythTV nowadays as VDPAU, maybe my HTPC could pull more serious double duty as a miner...at least until ASICs take over.  (Playing 1080p H.264 only knocks about 300 kH/s off of the GT210's hashrate.)

(As an aside: on the Windows box, guiminer gives me zero CPU load with the CUDA miner, but it doesn't pass the username parameter through to my P2Pool server properly for some reason.)

[Fiyasko]

Try other miners and kernals

[crazyates]

Dont mine on nVidia hardware unless you have a 6xx

FTFY

Seriously, even the 680 doesn't even get 150MH/s, last time I checked.

Now to be fair, I starting getting into bitcoins by mining on my brother's GeForce 9800 GTX. I set it up so his screensaver was Phoenix tweaked to get about 30MH/s. Then I bought my first 5830

[senseless]

OP,

I feel your pain. I have a number of nvidia machines that we would like to mine on when idle. But can't because the opencl gpu bugs make the machines more or less unusable.

I'm willing to offer a reward for someone to code a cuda kernel for bfgminer

https://github.com/luke-jr/bfgminer/issues/132

I'd be willing to put up 10BTC reward for it.

rpcminer-cuda already has working cuda miner; but I have no idea how hard it would be to add the cubin files from rpcminer-cuda to bfgminer.

Edit:

Found this in my google crawl. The puddinpop rpcminer-cuda works pefectly. No cpu usage bug; but it lacks many features. I'm not sure how hard it would be for someone to add the cuda kernel to phoenix, cgminer or bfgminer?

http://luke.dashjr.org/programs/bitcoin/w/puddinpop-bitcoin-pool.git/tree/HEAD:/src/cuda

[salfter]

Salfter, You got your answers, Posting the same question into the CGminer forums isnt gonna get you more Help, It will get you more Hate

WTH are you talking about? You must have me mixed up with someone else...only thing I posted under the CGminer topic was an answer to this question that was posted by someone else.

[salfter]

k.. Why are you asking for help, Then when someone calls you out on multiasking (Wich is not a problem) You go and delete the other post?

Liar. I didn't delete anything.

I think im gonna play the Edit game.

Now I know you're just a pissant troll who's succeeded at wasting my time.   Grow up.

*** PLONK ***

[Fiyasko]

Jackrabbit, can you please go fuck yourself. Thank you.

Yeah alright, I tookout majority of my asinine posts

[GernMiester]

Give up, your wasting electricity with that sad setup.
The cards are not 'suboptimal" they are a joke of all jokes. Like bringing a riding lawnmower to race a top fuel funny car at the strip.