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# Environment Variables
## HSA_ENABLE_SDMA
Possible values:
* 0:Disabled
* 1:Enabled (Default Value)
This will enable or disable the use of DMA engines in all copy directions (Host-to-Device, Device-to-Host, Device-to-Device) when using the following APIs:
`hsa_memory_copy`, `hsa_amd_memory_fill`, `hsa_amd_memory_async_copy`, `hsa_amd_memory_async_copy_on_engine`
## HSA_ENABLE_PEER_SDMA
Possible values:
* 0:Disabled
* 1:Enabled (Default Value)
This will enable or disable the use of DMA engines for Device-to-Device copies when using the following APIs:
`hsa_memory_copy`, `hsa_amd_memory_async_copy`, `hsa_amd_memory_async_copy_on_engine`
The value of `HSA_ENABLE_PEER_SDMA` is ignored if `HSA_ENABLE_SDMA` is used to disable the use of DMA engines.
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