From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: Re: nfs-utils inode cache patch Date: Tue, 13 Mar 2007 10:47:14 -0400 Message-ID: <20070313144714.GF23604@fieldses.org> References: <20070309180921.57ae908c.simon.peter@gmx.de> <17910.9971.125407.778285@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: nfs@lists.sourceforge.net, Simon Peter To: Neil Brown Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1HR8HZ-0005aK-Tk for nfs@lists.sourceforge.net; Tue, 13 Mar 2007 07:47:22 -0700 Received: from mail.fieldses.org ([66.93.2.214] helo=fieldses.org) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1HR8HY-00076d-Dv for nfs@lists.sourceforge.net; Tue, 13 Mar 2007 07:47:23 -0700 In-Reply-To: <17910.9971.125407.778285@notabene.brown> List-Id: "Discussion of NFS under Linux development, interoperability, and testing." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nfs-bounces@lists.sourceforge.net Errors-To: nfs-bounces@lists.sourceforge.net On Tue, Mar 13, 2007 at 03:22:11PM +1100, Neil Brown wrote: > While reflecting I remembered that I like the fact that unused > information eventually disappeared from the kernel (where memory > cannot be pages out). This information won't any more. > > But that probably isn't a big cost. The cost of the export structure itself should be very small. I would have guessed that the it's the mounts that are the bigger problem. But I think additional work is needed to allow us to keep only currently used filesystems mounted. And in any case if Olaf is right then it may not be the cost of keeping those filesystems mounted so much as the time required to mount them all at once on startup. So that might be the problem to work on first. But I wonder how much memory it takes to keep a few thousand mounts? And in addition to the memory, are there any bits of VFS code that don't scale well to lots of mounts? --b. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs