Date: Mon, 30 Dec 1996 19:28:47 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: toor@dyson.iquest.net (John S. Dyson) Cc: terry@lambert.org, julian@whistle.com, luigi@labinfo.iet.unipi.it, proff@iq.org, danny@panda.hilink.com.au, hackers@freebsd.org Subject: Re: ipretard.c selective tcp/ip queues and throughput limiters Message-ID: <199612310228.TAA01319@phaeton.artisoft.com> In-Reply-To: <199612280319.WAA07203@dyson.iquest.net> from "John S. Dyson" at Dec 27, 96 10:19:01 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> > For instance, for FS's, the VFS is well defined, but the VM interface > > for doing actual disk I/O is not well abstracted at all. > > The VM code uses direct disk input when the filesystem allows it. Otherwise, > the filesystems can do VOP_READ operations as in normal UFS read write > operations. The vnode pageout uses VOP_WRITE operations. Refer to > vnode_pager (where the VM input output operations happen.) I don't think > that there are layering problems anymore (there were initially though.) No, this particular issue isn't layering -- my favorite harp to play -- it's basically definition information that would be in a "file system writer's guide"... if there were one. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199612310228.TAA01319>