[Bug 208130] smbfs is slow because it (apparently) doesn't do any caching/buffering

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat Oct 6 21:00:39 UTC 2018


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208130

noah.bergbauer at tum.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|10.2-RELEASE                |11.1-RELEASE

--- Comment #1 from noah.bergbauer at tum.de ---
Revisiting this 2.5 years later, no improvement.

But one possible workaround is to mount the smbfs, then create an md(4) disk
from a file on the mount and finally mount UFS on top of that. The
filesystem-level buffer management ensures that inefficiently small IO will
never hit the network (increase the md disk sector size as needed, 4K already
gives me well over 40 MiB/s).

This obviously breaks file sharing but at least it allows using samba shares
for simple remote storage (poor man's iSCSI) with decent performance.

It's a shame there is no filesystem-level equivalent of gcache(8) (which by the
way is the solution if you just need a block device instead of a filesystem).

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