K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2018-08-02T19:25:43.414726Z
K 7
svn:log
V 685
FUSE: Bump maximum IO size to enable more performant operation

Various components restrict size of IO passed up to the userspace filesystem
based on the mount's f_iosize value.  The previous default of PAGE_SIZE
is anemic, even for normal filesystems, but especially considering every
FUSE operation involves a kernel <-> userspace IPC upcall.

Bump to DFLTPHYS (currently 64kB) to match other FUSE implementations.

Anecdotally, Jakub reports IO read performance increased from 600 MB/s ->
2700 MB/s with a basic RAM-backed FUSE filesystem.

PR:		230260
Reported by:	Peter (MooseFS) <freebsd AT moosefs.com>
Tested by:	Jakub Kruszona-Zawadzki <acid AT moosefs.com>
MFC after:	3 days

END