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

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

--- Comment #6 from noah.bergbauer at tum.de ---
I still don't know what causes this extra 0.65ms latency (see my previous
comment for details) but I noticed that there appears to be some per-mount
synchronization going on: Two IO streams on a single smbfs mount share the
60MB/s bandwidth, i.e. they get 30 each, whereas two unique mounts of the same
samba share each get the full 60MB/s. And indeed: just slap a gmultipath(8) in
there and the bandwidth issue is gone!

This hack is quite a mess but so far it's stable, fast and it works
astonishingly great. I'm actually planning using this in production.

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