On 8/27/2021 9:27 AM, Christoph Hellwig wrote:

On Thu, Aug 26, 2021 at 05:26:11PM +0000, Chuck Lever III wrote:

quoted

Hi-

I have a report that net/sunrpc/xprtrdma/frwr_ops.c::frwr_map()
is attempting to register a mix of GPU and CPU pages with a
single MR during an NFSv4 READ.

What GPU pages?

I guess it's GPU device memory.

But as Jason mentioned, This is still not supported in RDMA. So there 
should be a bounce buffer in the IO path between GPU and CPU memory 
subsystems.