The difference between gm_dma_malloc and mmap

Hi,

I have one question about gm_dma_malloc (or gm_register_memory) and mmap.
As I know, the maximum memory available for registration (i.e.  dma) is 
503 MBytes.
I got this value from kernel message, when I load Mryinet GM driver.

However, NIC memory in my Myrinet NIC is 8 Mbytes.
So, I can mmap upto 8Mbytes theoretically for memory mapping.

I am wondering the difference between gm_dma_malloc and mmap in Myrinet NIC.

Best,
--Gyu Sang

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