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From: Neil Brown <neilb@cse.unsw.edu.au>
To: Willy Tarreau <willy@w.ods.org>
Date: Sat, 9 Apr 2005 17:47:08 +1000
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Cc: Chris Wedgwood <cw@f00f.org>, Linus Torvalds <torvalds@osdl.org>,
       Jeff Garzik <jgarzik@pobox.com>,
       Matthias-Christian Ott <matthias.christian@tiscali.de>,
       Andrea Arcangeli <andrea@suse.de>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Kernel SCM saga..
In-Reply-To: message from Willy Tarreau on Saturday April 9
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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...

NeilBrown
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