On Fri, Nov 25, 2016 at 02:49:50PM -0500, Serguei Sagalovitch wrote:
GPU could perfectly access all VRAM. It is only issue for p2p
special interconnect and CPU access. Strictly speaking as long as we
have "bus address" we could have RDMA but I agreed that for
RDMA we could/should(?) always "request" CPU address (I hope that we
could forget about 32-bit application :-)).
At least on x86 if you have a bus address you have a CPU address. All
RDMAable VRAM has to be visible in the BAR.
BTW/FYI: About CPU access: Some user-level API is mainly handle
so there is no need for CPU access by default.
You mean no need for the memory to be virtually mapped into the
Do you expect to RDMA from this kind of API? How will that work?