RE: [RFC PATCH 2/3] x86/io: implement 256-bit IO read and write

From: Rahul Lakkireddy

Sent: 20 March 2018 13:32

...

On High Availability Server, the logs of the failing system must be
collected as quickly as possible.  So, we're concerned with the amount
of time taken to collect our large on-chip memory.  We see improvement
in doing 256-bit reads at a time.

Two other options:

1) Get the device to DMA into host memory.

2) Use mmap() (and vm_iomap_memory() in your driver) to get direct
   userspace access to the (I assume) PCIe memory space.
   You can then use whatever copy instructions the cpu has.
   (Just don't use memcpy().)

	David