When I run ethminer -G it starts the miner as expected. It takes around 60 seconds to allocate the DAG, and then it starts pumping out hashes on the GPU (at a dismal 1MH/s but that's besides the point.)

 cl  09:49:13|cl-0      DAG 93 %
 cl  09:49:13|cl-0      Switch time 52536 ms / 49530777 us
  m  09:49:13|main      Speed   0.00 Mh/s    gpu/0  0.00  [A0+0:R0+0:F0] Time: 00:00
  m  09:49:14|main      Speed   1.04 Mh/s    gpu/0  1.04  [A0+0:R0+0:F0] Time: 00:00
  m  09:49:14|main      Speed   1.04 Mh/s    gpu/0  1.04  [A0+0:R0+0:F0] Time: 00:00

However, when I attempt to connect to a pool, for example ethminer -F http://eth1.nanopool.org:8888/0xddb296fbb8882e35e500747bf684f63687437431 -G then it sputters with

 X  09:52:39|cl-0      Creating DAG buffer failed: clCreateBuffer -61 
 X  09:52:39|cl-0      OpenCL Error: clEnqueueWriteBuffer -38

If it wasn't working with just the -G I would understand it and have some debugging to do. But I fail to see why having the payload come from a pool instead of locally would cause it to fail so.

I notice the buffer sizes are different - on the non-pool version, I get cl 09:48:27|cl-0 Creating DAG buffer, size 1073739904 but on the pool version I get cl 09:52:39|cl-0 Creating DAG buffer, size 2298476672 so this is likely the cause of the problem - but I still don't see why it exists.

If I try a different pool will that change things? What options do I have?

  • Yea I think your best bet is to first manually delete the existing DAG file from your system and try again. If that does not work I would just try another pool. – Nicholas Porter Sep 13 '18 at 23:24
  • Also updating your EthMiner and drivers for your GPU is always a good thing to do. – Nicholas Porter Sep 13 '18 at 23:25

first check your mining pool info update, then check updates on your miner software

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