On 04/12/2016 09:51 AM, Christoph Hellwig wrote:
On Tue, Apr 12, 2016 at 08:34:03AM -0700, Bart Van Assche wrote:
ib_sg_to_pages() can handle segments that are larger than mr->page_size.
The interface handles it fine, but we'll still end up using a segment
per (MR) page.
Have you considered to set queue_limits.max_hw_sectors instead of
max_segment_size?
That's what NVMe does, but I don't think it's a good idea. Because
of the unaligned start into the page this means you have to set the limit
to one lower than the actual hardware limit.
I think this means that there is a mismatch between the current block
layer limits and what NVMe / RDMA drivers need ...
Bart.
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