[Bug 267631] slow nfs from FreeBSD guest/client to linux host/server

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267631

--- Comment #3 from Vladimir Druzenko <vvd@FreeBSD.org> ---
BTW, man page mount_nfs says that 4 is max value and 0 is allowed:
             readahead=⟨value⟩
                     Set the read-ahead count to the specified value.  This
                     may be in the range of 0 - 4, and determines how many
                     blocks will be read ahead when a large file is being read
                     sequentially.  Trying a value greater than 1 for this is
                     suggested for mounts with a large bandwidth * delay
                     product.

With value 0 mount_nfs print error message and exit. And max value is 16 now,
not 4.

IMHO, better to increase this value for at least 128 (or even 1024 to "cover"
more than 10GE).

I can't test patches to kernel often: I have 2 hosts with 10GE and both are in
production.

One more question to fs@: is it possible to set default readahead on server
side?

P.S. This may be a topic for another PR, but maybe I'll create one later if
someone from fs@ asks for it.

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