Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261309AbVDIIBU (ORCPT ); Sat, 9 Apr 2005 04:01:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261310AbVDIIBU (ORCPT ); Sat, 9 Apr 2005 04:01:20 -0400 Received: from willy.net1.nerim.net ([62.212.114.60]:44040 "EHLO willy.net1.nerim.net") by vger.kernel.org with ESMTP id S261309AbVDIIBO (ORCPT ); Sat, 9 Apr 2005 04:01:14 -0400 Date: Sat, 9 Apr 2005 10:00:56 +0200 From: Willy Tarreau To: Neil Brown Cc: Chris Wedgwood , Linus Torvalds , Jeff Garzik , Matthias-Christian Ott , Andrea Arcangeli , Kernel Mailing List Subject: Re: Kernel SCM saga.. Message-ID: <20050409080056.GA8551@alpha.home.local> References: <20050408071428.GB3957@opteron.random> <4256AE0D.201@tiscali.de> <4256C0F8.6030008@pobox.com> <20050408185608.GA5638@taniwha.stupidest.org> <20050409073726.GC7858@alpha.home.local> <16983.34940.197017.568255@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16983.34940.197017.568255@cse.unsw.edu.au> User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1168 Lines: 28 On Sat, Apr 09, 2005 at 05:47:08PM +1000, Neil Brown wrote: > On Saturday April 9, willy@w.ods.org wrote: > > > > I've just checked, it takes 5.7s to compare 2.4.29{,-hf3} over NFS (13300 > > files each) and 1.3s once the trees are cached locally. This is without > > comparing file contents, just meta-data. And it takes 19.33s to compare > > the file's md5 sums once the trees are cached. I don't know if there are > > ways to avoid some NFS operations when everything is cached. > > > > Anyway, the system does not seem much efficient on hard links, it caches > > the files twice :-( > > I suspect you'll be wanting to add a "no_subtree_check" export option > on your NFS server... Thanks a lot, Neil ! This is very valuable information. I didn't understand such implications from the exports(5) man page, but it makes a great difference. And the diff sped up from 5.7 to 3.9s and from 19.3 to 15.3s. Cheers, Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/