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FUSE: Bump maximum IO size to enable more performant operation

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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
This commit is contained in:
Conrad Meyer 2018-08-02 19:25:43 +00:00
parent c423a5e6b8
commit dab6195cd3
1 changed files with 1 additions and 1 deletions
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2
sys/fs/fuse/fuse_vfsops.c
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@ -341,7 +341,7 @@ fuse_vfsop_mount(struct mount *mp)
mp->mnt_kern_flag |= MNTK_USES_BCACHE;
MNT_IUNLOCK(mp);
/* We need this here as this slot is used by getnewvnode() */
mp->mnt_stat.f_iosize = PAGE_SIZE;
mp->mnt_stat.f_iosize = DFLTPHYS;
if (subtype) {
strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);