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Adept I

What's the type of SVM cache supported?

SVM logically extends global memory into host address space, and the cache support for global memory  on Kaveri is CL_READ_WRITE_CACHE.

Does it mean that SVM will be cached as read and write type?

Does anyone know the difference between zero copy buffer and SVM ? which one is preferred to use?

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Adept I

Re: What's the type of SVM cache supported?

Cache behavior depends on fine grain and coarse grain SVM. With coarse grain, since the coherency is guaranteed to sync points like kernel launch/exit, the cache invalidation happens only at sync points. For fine grain, it can be controlled by the developer using c11 memory model/atomics. Zero copy buffer is still buffer and so pointers (within a data structure) cannot be shared.