Date: Sun, 18 Apr 1999 12:55:33 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "John S. Dyson" <toor@dyson.iquest.net> Cc: peter@netplex.com.au (Peter Wemm), dyson@iquest.net, dg@root.com, hackers@freebsd.org Subject: Re: Directories not VMIO cached at all! Message-ID: <199904181955.MAA81804@apollo.backplane.com> References: <199904181657.LAA18643@dyson.iquest.net>
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:...
:the current caching scheme comes into play. Also, NFS is a weird
:monster in it's own right. Frankly, NFS is a candidate to make into
:a true merged filesystem (bypassing the buffer cache entirely), and
:FFS is such a candidate because of it being so common.
:
:Since the need for backwards compatibility with the old BSD style
:buffer cache isn't really needed any more (softupdates is likely
:the only important development that legacy support is needed), I
:strongly suggest "fixing" the commonly used filesystems to bypass
:the majority of the vfs_bio complexity now. (That was in my plans.)
:
:John
The new NFS hacks I've been working on use the buffer cache the
same way FFS does, except for one case that still requires use
of b_dirtyoff/dirtyend.
I think bypassing the buffer cache ( getting rid of it entirely, or
devolving it into a simple KVM mapping scheme! ) is doable. Maybe
later this year, though.
-Matt
Matthew Dillon
<dillon@backplane.com>
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