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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