svn commit: r259765 - in head/sys: fs/nfsserver nfs nfsserver

[Konstantin Belousov]

On Mon, Dec 23, 2013 at 08:43:17AM +0000, Alexander Motin wrote:
> Author: mav
> Date: Mon Dec 23 08:43:16 2013
> New Revision: 259765
> URL: http://svnweb.freebsd.org/changeset/base/259765
> 
> Log:
>   Fix RPC server threads file handle affinity to work better with ZFS.
>   
>     Instead of taking 8 specific bytes of file handle to identify file during
>   RPC thread affitinity handling, use trivial hash of the full file handle.
>   ZFS's struct zfid_short does not have padding field after the length field,
>   as result, originally picked 8 bytes are loosing lower 16 bits of object ID,
>   causing many false matches and unneeded requests affinity to same thread.
>     This fix substantially improves NFS server latency and scalability in SPEC
>   NFS benchmark by more flexible use of multiple NFS threads.
>   
>   Sponsored by:	iXsystems, Inc.

Did you audited all other filesystems to ensure that struct fid.
fid_data0 is filled (zeroed) consistently ?  Also, this constitues
subtle VFS KBI change.
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