K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2020-01-07T21:17:11.369471Z
K 7
svn:log
V 504
Add Host Memory Buffer support to nvme(4).

This allows cheapest DRAM-less NVMe SSDs to use some of host RAM (about
1MB per 1GB on the devices I have) for its metadata cache, significantly
improving random I/O performance.  Device reports minimal and preferable
size of the buffer.  The code limits it to 1% of physical RAM by default.
If the buffer can not be allocated or below minimal size, the device will
just have to work without it.

MFC after:	2 weeks
Relnotes:	yes
Sponsored by:	iXsystems, Inc.

END