From: Neil Brown <neilb@cse.unsw.edu.au>
To: Willy Tarreau <willy@w.ods.org>
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..
Date: Sat, 9 Apr 2005 19:34:10 +1000 [thread overview]
Message-ID: <16983.41362.375073.942173@cse.unsw.edu.au> (raw)
In-Reply-To: message from Willy Tarreau on Saturday April 9
On Saturday April 9, willy@w.ods.org wrote:
> 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.
No, that implication had never really occurred to me before either.
But when you said "caches the file twice" it suddenly made sense.
With subtree_check, the NFS file handle contains information about the
directory, and NFS uses the filehandle as the primary key to tell if
two things are the same or not.
Trond keeps prodding me to make no_subtree_check the default. Maybe it
is time that I actually did....
NeilBrown
next prev parent reply other threads:[~2005-04-09 9:34 UTC|newest]
Thread overview: 206+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-06 15:42 Kernel SCM saga Linus Torvalds
2005-04-06 16:00 ` Greg KH
2005-04-07 16:40 ` Rik van Riel
2005-04-08 0:53 ` Jesse Barnes
2005-04-06 16:09 ` Daniel Phillips
2005-04-06 19:07 ` Jon Smirl
2005-04-06 19:24 ` Matan Peled
2005-04-06 19:49 ` Jon Smirl
2005-04-06 20:34 ` Hua Zhong
2005-04-07 1:31 ` Christoph Lameter
2005-04-06 19:39 ` Paul P Komkoff Jr
2005-04-07 1:40 ` Martin Pool
2005-04-07 1:47 ` Jeff Garzik
2005-04-07 2:26 ` Martin Pool
2005-04-07 2:32 ` David Lang
2005-04-07 5:38 ` Martin Pool
2005-04-07 23:27 ` Linus Torvalds
2005-04-08 5:56 ` Martin Pool
2005-04-08 6:41 ` Linus Torvalds
2005-04-08 8:38 ` Andrea Arcangeli
2005-04-08 23:38 ` Daniel Phillips
2005-04-09 2:54 ` Andrea Arcangeli
2005-04-09 0:12 ` Linus Torvalds
2005-04-09 2:27 ` Andrea Arcangeli
2005-04-09 2:32 ` David Lang
2005-04-09 3:08 ` Brian Gerst
2005-04-09 3:15 ` Andrea Arcangeli
2005-04-09 5:45 ` Linus Torvalds
2005-04-09 22:55 ` David S. Miller
2005-04-09 23:13 ` Linus Torvalds
2005-04-10 0:14 ` Chris Wedgwood
2005-04-10 1:56 ` Paul Jackson
2005-04-10 12:03 ` Ingo Molnar
2005-04-10 17:38 ` Paul Jackson
2005-04-10 17:46 ` Ingo Molnar
2005-04-10 17:56 ` Paul Jackson
2005-04-10 0:22 ` Paul Jackson
2005-04-10 11:33 ` Ingo Molnar
2005-04-10 17:55 ` Matthias Andree
2005-04-09 16:33 ` Roman Zippel
2005-04-09 23:31 ` Tupshin Harper
2005-04-10 17:24 ` Code snippet to reconstruct ancestry graph from bk repo Paul P Komkoff Jr
2005-04-10 18:19 ` Roman Zippel
2005-04-08 16:46 ` Kernel SCM saga Catalin Marinas
2005-04-07 8:14 ` Magnus Damm
2005-04-07 7:53 ` Zwane Mwaikambo
2005-04-07 3:35 ` Daniel Phillips
2005-04-07 15:08 ` Daniel Phillips
2005-04-07 6:36 ` bert hubert
2005-04-06 23:22 ` Jon Masters
2005-04-07 6:51 ` Paul Mackerras
2005-04-07 7:48 ` Arjan van de Ven
2005-04-07 15:10 ` Linus Torvalds
2005-04-07 17:00 ` Daniel Phillips
2005-04-07 17:38 ` Linus Torvalds
2005-04-07 17:47 ` Chris Wedgwood
2005-04-07 18:06 ` Magnus Damm
2005-04-07 18:36 ` Daniel Phillips
2005-04-08 3:35 ` Jeff Garzik
2005-04-07 19:56 ` Sam Ravnborg
2005-04-07 23:21 ` Dave Airlie
2005-04-07 7:18 ` David Woodhouse
2005-04-07 8:50 ` Andrew Morton
2005-04-07 9:20 ` Paul Mackerras
2005-04-07 9:46 ` Andrew Morton
2005-04-07 11:17 ` Paul Mackerras
2005-04-07 10:41 ` Geert Uytterhoeven
2005-04-07 9:25 ` David Woodhouse
2005-04-07 9:49 ` Andrew Morton
2005-04-07 9:55 ` Russell King
2005-04-07 10:11 ` David Woodhouse
2005-04-07 9:40 ` David Vrabel
2005-04-07 9:24 ` Sergei Organov
2005-04-07 10:30 ` Matthias Andree
2005-04-07 10:54 ` Andrew Walrond
2005-04-09 16:17 ` David Roundy
2005-04-10 9:24 ` Giuseppe Bilotta
2005-04-10 13:51 ` David Roundy
2005-04-07 15:32 ` Linus Torvalds
2005-04-07 17:09 ` Daniel Phillips
2005-04-07 17:10 ` Al Viro
2005-04-07 17:47 ` Linus Torvalds
2005-04-07 18:04 ` Jörn Engel
2005-04-07 18:27 ` Daniel Phillips
2005-04-07 20:54 ` Arjan van de Ven
2005-04-08 3:41 ` Jeff Garzik
2005-04-07 17:52 ` Bartlomiej Zolnierkiewicz
2005-04-07 17:54 ` Daniel Phillips
2005-04-07 18:13 ` Dmitry Yusupov
2005-04-07 18:29 ` Daniel Phillips
2005-04-10 22:33 ` Troy Benjegerdes
2005-04-11 0:00 ` Christian Parpart
2005-04-08 17:24 ` Jon Masters
2005-04-08 22:05 ` Daniel Phillips
2005-04-08 22:52 ` Roman Zippel
2005-04-08 23:46 ` Tupshin Harper
2005-04-09 1:00 ` Roman Zippel
2005-04-09 1:23 ` Tupshin Harper
2005-04-09 16:52 ` Eric D. Mudama
2005-04-09 17:40 ` Roman Zippel
2005-04-09 18:56 ` Ray Lee
2005-04-07 7:44 ` Jan Hudec
2005-04-08 6:14 ` Matthias Urlichs
2005-04-09 1:01 ` Marcin Dalecki
2005-04-09 8:32 ` Jan Hudec
2005-04-11 2:26 ` Miles Bader
2005-04-11 2:56 ` Marcin Dalecki
2005-04-11 6:36 ` Jan Hudec
2005-04-07 10:56 ` Andrew Walrond
2005-04-08 0:57 ` Ian Wienand
2005-04-08 4:13 ` Chris Wedgwood
2005-04-08 4:42 ` Linus Torvalds
2005-04-08 5:04 ` Chris Wedgwood
2005-04-08 5:14 ` H. Peter Anvin
2005-04-08 7:05 ` Rogan Dawes
2005-04-08 7:21 ` Daniel Phillips
2005-04-08 7:49 ` H. Peter Anvin
2005-04-08 7:14 ` Andrea Arcangeli
2005-04-08 12:02 ` Matthias Andree
2005-04-08 12:21 ` Florian Weimer
2005-04-08 14:26 ` Linus Torvalds
2005-04-08 16:15 ` Matthias-Christian Ott
2005-04-08 17:14 ` Linus Torvalds
2005-04-08 17:15 ` Chris Wedgwood
2005-04-08 17:46 ` Linus Torvalds
2005-04-08 18:05 ` Chris Wedgwood
2005-04-08 19:03 ` Linus Torvalds
2005-04-08 19:16 ` Chris Wedgwood
2005-04-08 19:38 ` Florian Weimer
2005-04-08 19:48 ` Chris Wedgwood
2005-04-08 19:39 ` Linus Torvalds
2005-04-08 20:11 ` Uncached stat performace [ Was: Re: Kernel SCM saga.. ] Ragnar Kjørstad
2005-04-08 20:14 ` Chris Wedgwood
2005-04-08 20:50 ` Kernel SCM saga Luck, Tony
2005-04-08 21:27 ` Linus Torvalds
2005-04-09 17:14 ` Roman Zippel
2005-04-09 7:20 ` Willy Tarreau
2005-04-09 15:15 ` Paul Jackson
2005-04-08 17:25 ` Matthias-Christian Ott
2005-04-08 18:14 ` Linus Torvalds
2005-04-08 18:28 ` Jon Smirl
2005-04-08 18:58 ` Florian Weimer
2005-04-09 1:11 ` Marcin Dalecki
2005-04-09 1:50 ` David Lang
2005-04-09 22:12 ` Florian Weimer
2005-04-08 19:16 ` Matthias-Christian Ott
2005-04-08 19:32 ` Linus Torvalds
2005-04-08 19:44 ` Matthias-Christian Ott
2005-04-09 1:09 ` Marcin Dalecki
2005-04-08 17:35 ` Jeff Garzik
2005-04-08 18:47 ` Linus Torvalds
2005-04-08 18:56 ` Chris Wedgwood
2005-04-09 7:37 ` Willy Tarreau
2005-04-09 7:47 ` Neil Brown
2005-04-09 8:00 ` Willy Tarreau
2005-04-09 9:34 ` Neil Brown [this message]
2005-04-09 15:40 ` Paul Jackson
2005-04-09 16:16 ` Linus Torvalds
2005-04-09 17:15 ` Paul Jackson
2005-04-09 17:35 ` Paul Jackson
2005-04-09 1:04 ` Marcin Dalecki
2005-04-09 15:42 ` Paul Jackson
2005-04-09 18:45 ` Marcin Dalecki
2005-04-09 1:00 ` Marcin Dalecki
2005-04-09 1:09 ` Chris Wedgwood
2005-04-09 1:21 ` Marcin Dalecki
2005-04-08 7:17 ` ross
2005-04-08 15:50 ` Linus Torvalds
2005-04-09 2:53 ` Petr Baudis
2005-04-09 7:08 ` Randy.Dunlap
2005-04-09 18:06 ` [PATCH] " Petr Baudis
2005-04-10 1:01 ` Phillip Lougher
2005-04-10 1:42 ` Petr Baudis
2005-04-10 1:57 ` Phillip Lougher
2005-04-09 15:50 ` Paul Jackson
2005-04-09 16:26 ` Linus Torvalds
2005-04-09 17:08 ` Paul Jackson
2005-04-10 3:41 ` Paul Jackson
2005-04-10 8:39 ` David Lang
2005-04-10 9:40 ` Junio C Hamano
2005-04-10 16:46 ` Bill Davidsen
2005-04-10 17:50 ` Paul Jackson
2005-04-12 23:20 ` Pavel Machek
2005-04-08 7:34 ` Marcel Lanz
2005-04-08 9:23 ` Geert Uytterhoeven
2005-04-08 8:38 ` Matt Johnston
2005-04-12 7:14 ` Kernel SCM saga.. (bk license?) Kedar Sovani
2005-04-12 9:34 ` Catalin Marinas
2005-04-13 4:04 ` Ricky Beam
2005-04-08 11:42 ` Kernel SCM saga Catalin Marinas
[not found] <Pine.LNX.4.58.0504060800280.2215 () ppc970 ! osdl ! org>
2005-04-06 21:13 ` kfogel
2005-04-06 22:39 ` Jeff Garzik
2005-04-09 1:00 ` Marcin Dalecki
2005-04-06 22:37 Wolfgang Denk
2005-04-06 23:16 ` Tom Rini
2005-04-06 23:21 ` Eugene Surovegin
2005-04-06 23:33 ` Dan Malek
2005-04-07 0:13 ` Benjamin Herrenschmidt
2005-04-08 22:27 Rajesh Venkatasubramanian
2005-04-08 23:29 ` Linus Torvalds
2005-04-09 0:29 ` Linus Torvalds
2005-04-09 16:20 ` Paul Jackson
2005-04-09 4:06 Walter Landry
2005-04-09 11:02 Samium Gromoff
2005-04-09 11:29 Samium Gromoff
2005-04-10 4:20 Albert Cahalan
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