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Vm storage performance very slow compared to host


Im passing a ssd as a physical disk to a vm in vmware. The disk is entirely dedicated to that vm and is offlined in the host. This somehow lowers the sequential speeds in that disk in half and lowers all of the 4k random read benchmarks by a factor of 6-10 so I'm only getting a tiny fraction of disk performance in the vm. Obviously if i made a vmdk virtual disk file instead of passing the physical disk,  it would be even slower.  I was hoping that by passing the physical disk,  I would get around the performance decrease altogether.  However,  this is not the case as the vm is still using a virtual disk controller and is not seeing my disk as an Intel 660p. Is there anyway to get around this and get the full performance out of my disk, or anything better than what Im getting now? 

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