From owner-freebsd-hackers Sun Apr 18 12:58: 9 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from apollo.backplane.com (apollo.backplane.com [209.157.86.2]) by hub.freebsd.org (Postfix) with ESMTP id E161114D3B for ; Sun, 18 Apr 1999 12:58:07 -0700 (PDT) (envelope-from dillon@apollo.backplane.com) Received: (from dillon@localhost) by apollo.backplane.com (8.9.3/8.9.1) id MAA81804; Sun, 18 Apr 1999 12:55:33 -0700 (PDT) (envelope-from dillon) Date: Sun, 18 Apr 1999 12:55:33 -0700 (PDT) From: Matthew Dillon Message-Id: <199904181955.MAA81804@apollo.backplane.com> To: "John S. Dyson" Cc: peter@netplex.com.au (Peter Wemm), dyson@iquest.net, dg@root.com, hackers@freebsd.org Subject: Re: Directories not VMIO cached at all! References: <199904181657.LAA18643@dyson.iquest.net> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :... :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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message