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If you get an error about clCreateBuffer - lower your rawintensity. See the example config xmr.conf for details.
Generally, you want to raise rawintensity as high as it will go without error - but remember, 2MiB of GPU RAM is needed for every work-item.
The GPU fan, powertune, and clock setting options are accepted, as the configuration routine was ripped from my own full-custom miner, but they do nothing.
.... hyc's additions (Linux only):
Use a GPU index of -1 to run on the CPU. The only other config item needed is "threads", but rawIntensity and worksize must still be set to a non-zero value.
As with the original CPU miner, you can gain a performance boost by configuring huge pages. Check current setting with "sysctl vm.nr_hugepages" then set it to at least 3 times the total number of threads you're using, as root. sudo sysctl -w vm.nr_hugepages=num
Also, it can run faster as root, which allows it to use mlock.