From: "Jörn Engel" <joern@logfs.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Arjan van de Ven" <arjan@infradead.org>,
"Willy Tarreau" <w@1wt.eu>, "Jörn Engel" <joern@logfs.org>,
"Alan Cox" <alan@lxorguk.ukuu.org.uk>,
"Jeff Garzik" <jeff@garzik.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de,
dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com,
nikita@clusterfs.com, trond.myklebust@fys.uio.no,
yingchao.zhou@gmail.com, richard@rsk.demon.co.uk, david@lang.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8
Date: Sun, 5 Aug 2007 22:21:12 +0200 [thread overview]
Message-ID: <20070805202112.GA32088@lazybastard.org> (raw)
In-Reply-To: <20070805183714.GA31606@lazybastard.org>
On Sun, 5 August 2007 20:37:14 +0200, Jörn Engel wrote:
>
> Guess I should throw in a kernel compile test as well, just to get a
> feel for the performance.
Three runs each of noatime, relatime and atime, both with cold caches
and with warm caches. Scripts below. Run on a Thinkpad T40, 1.5GHz,
2GiB RAM, 60GB 2.5" IDE disk, ext3.
Biggest difference between atime and noatime (median run, cold cache) is
~2.3%, nowhere near the numbers claimed by Ingo. Ingo, how did you
measure 10% and more?
noatime, cold cache relatime, cold cache atime, cold cache
real 2m10.242s real 2m10.549s real 2m10.388s
user 1m46.886s user 1m46.680s user 1m47.000s
sys 0m8.243s sys 0m8.423s sys 0m8.239s
real 2m11.270s real 2m11.212s real 2m14.280s
user 1m46.940s user 1m46.776s user 1m46.670s
sys 0m8.139s sys 0m8.283s sys 0m8.503s
real 2m11.601s real 2m14.861s real 2m14.335s
user 1m46.920s user 1m47.103s user 1m46.846s
sys 0m8.246s sys 0m8.266s sys 0m8.349s
noatime, warm cache relatime, warm cache atime, warm cache
real 1m55.894s real 1m56.053s real 1m56.905s
user 1m46.683s user 1m46.600s user 1m46.853s
sys 0m8.186s sys 0m8.349s sys 0m8.249s
real 1m55.823s real 1m56.093s real 1m57.077s
user 1m46.583s user 1m46.913s user 1m46.590s
sys 0m8.259s sys 0m7.966s sys 0m8.523s
real 1m55.789s real 1m56.214s real 1m57.224s
user 1m46.803s user 1m46.753s user 1m46.953s
sys 0m8.053s sys 0m8.113s sys 0m8.113s
Jörn
--
Data expands to fill the space available for storage.
-- Parkinson's Law
Cold cache script:
#!/bin/sh
make distclean
echo 1 > /proc/sys/vm/drop_caches
echo 2 > /proc/sys/vm/drop_caches
echo 3 > /proc/sys/vm/drop_caches
make allnoconfig
time make
Warm cache script:
#!/bin/sh
make distclean
make allnoconfig
rgrep laksdflkdsaflkadsfja .
time make
next prev parent reply other threads:[~2007-08-05 20:25 UTC|newest]
Thread overview: 189+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-03 12:37 [PATCH 00/23] per device dirty throttling -v8 Peter Zijlstra
2007-08-03 12:37 ` [PATCH 01/23] nfs: remove congestion_end() Peter Zijlstra
2007-08-03 12:37 ` [PATCH 02/23] lib: percpu_counter_add Peter Zijlstra
2007-08-03 12:37 ` [PATCH 03/23] lib: percpu_counter variable batch Peter Zijlstra
2007-08-03 12:37 ` [PATCH 04/23] lib: make percpu_counter_add take s64 Peter Zijlstra
2007-08-03 12:37 ` [PATCH 05/23] lib: percpu_counter_set Peter Zijlstra
2007-08-03 12:37 ` [PATCH 06/23] lib: percpu_counter_sum_positive Peter Zijlstra
2007-08-03 12:37 ` [PATCH 07/23] lib: percpu_count_sum() Peter Zijlstra
2007-08-03 12:37 ` [PATCH 08/23] lib: percpu_counter_init error handling Peter Zijlstra
2007-08-03 12:37 ` [PATCH 09/23] lib: percpu_counter_init_irq Peter Zijlstra
2007-08-03 12:37 ` [PATCH 10/23] mm: bdi init hooks Peter Zijlstra
2007-08-03 12:37 ` [PATCH 11/23] containers: " Peter Zijlstra
2007-08-03 12:37 ` [PATCH 12/23] mtd: " Peter Zijlstra
2007-08-03 12:37 ` [PATCH 13/23] mtd: clean up the backing_dev_info usage Peter Zijlstra
2007-08-03 12:37 ` [PATCH 14/23] mtd: give mtdconcat devices their own backing_dev_info Peter Zijlstra
2007-08-03 12:37 ` [PATCH 15/23] mm: scalable bdi statistics counters Peter Zijlstra
2007-08-03 12:37 ` [PATCH 16/23] mm: count reclaimable pages per BDI Peter Zijlstra
2007-08-03 12:37 ` [PATCH 17/23] mm: count writeback " Peter Zijlstra
2007-08-09 19:15 ` Christoph Lameter
2007-08-09 19:23 ` Peter Zijlstra
2007-08-09 19:27 ` Christoph Lameter
2007-08-13 8:36 ` Peter Zijlstra
2007-08-03 12:37 ` [PATCH 18/23] mm: expose BDI statistics in sysfs Peter Zijlstra
2007-08-03 12:37 ` [PATCH 19/23] lib: floating proportions Peter Zijlstra
2007-08-03 12:37 ` [PATCH 20/23] lib: floating proportions _single Peter Zijlstra
2007-08-03 12:37 ` [PATCH 21/23] mm: per device dirty threshold Peter Zijlstra
2007-08-03 12:37 ` [PATCH 22/23] mm: dirty balancing for tasks Peter Zijlstra
2007-08-03 12:37 ` [PATCH 23/23] debug: sysfs files for the current ratio/size/total Peter Zijlstra
2007-08-03 22:21 ` [PATCH 00/23] per device dirty throttling -v8 Linus Torvalds
2007-08-04 6:32 ` Ingo Molnar
2007-08-04 7:07 ` Ingo Molnar
2007-08-04 7:44 ` david
2007-08-04 16:01 ` Ray Lee
2007-08-04 17:15 ` david
2007-08-09 5:11 ` david
2007-08-04 10:33 ` Ingo Molnar
2007-08-04 16:17 ` Linus Torvalds
2007-08-04 16:37 ` Ingo Molnar
2007-08-04 16:51 ` Andrew Morton
2007-08-04 16:56 ` Ingo Molnar
2007-08-04 20:23 ` Alan Cox
2007-08-04 17:02 ` Diego Calleja
2007-08-04 17:17 ` Ingo Molnar
2007-08-04 17:38 ` Diego Calleja
2007-08-04 17:51 ` Diego Calleja
2007-08-08 10:43 ` Karel Zak
2007-08-04 17:39 ` Linus Torvalds
2007-08-04 18:08 ` Jeff Garzik
2007-08-04 19:12 ` Jörn Engel
2007-08-04 19:21 ` Ingo Molnar
2007-08-04 19:26 ` Jörn Engel
2007-08-04 19:42 ` Jörn Engel
2007-08-05 20:36 ` Christoph Hellwig
2007-08-06 18:03 ` Chuck Ebbert
2007-08-06 18:53 ` Jeff Garzik
2007-08-06 19:37 ` Alan Cox
2007-08-06 19:46 ` Chuck Ebbert
2007-08-07 7:05 ` Ingo Molnar
2007-08-08 21:10 ` Martin J. Bligh
2007-08-08 21:21 ` Andrew Morton
2007-08-09 0:54 ` Martin Bligh
2007-08-11 23:14 ` Valerie Henson
2007-08-10 0:21 ` Bill Davidsen
2007-08-14 9:57 ` Helge Hafting
2007-08-04 19:47 ` Linus Torvalds
2007-08-04 19:49 ` Linus Torvalds
2007-08-04 20:00 ` Ingo Molnar
2007-08-04 20:11 ` Ingo Molnar
2007-08-04 20:13 ` Arjan van de Ven
2007-08-05 8:18 ` [patch] add noatime/atime boot options, CONFIG_DEFAULT_NOATIME Ingo Molnar
2007-08-04 20:13 ` [PATCH 00/23] per device dirty throttling -v8 Arjan van de Ven
2007-08-04 21:48 ` Theodore Tso
2007-08-05 18:01 ` Arjan van de Ven
2007-08-05 20:34 ` Christoph Hellwig
[not found] ` <fa.7rstQpXif2z9y2n2HD+qxLFnueg@ifi.uio.no>
[not found] ` <fa.6VOZrceT65Vh8CIRIta0zSg2V38@ifi.uio.no>
[not found] ` <fa.xcZCTa5cHDOhrcyXZ2gZbzbu7g0@ifi.uio.no>
[not found] ` <fa.JjZwG90x+07YaOx8h5VLN+9AL/8@ifi.uio.no>
[not found] ` <fa.V9U4mAEXVjNqblhzu7GRmxif7Uw@ifi.uio.no>
[not found] ` <fa.uq0BQtrgp66a08hpsF+vrqXUNC4@ifi.uio.no>
2007-08-15 18:16 ` david.balazic
2007-08-04 20:11 ` [PATCH 00/23] " Alan Cox
2007-08-04 20:28 ` Jeff Garzik
2007-08-04 21:47 ` Alan Cox
2007-08-04 23:51 ` Claudio Martins
2007-08-05 0:49 ` Alan Cox
2007-08-05 7:28 ` Ingo Molnar
2007-08-05 10:29 ` Jakob Oestergaard
2007-08-05 12:46 ` Alan Cox
2007-08-05 12:58 ` Ingo Molnar
2007-08-05 13:29 ` Willy Tarreau
2007-08-06 6:57 ` Ingo Molnar
2007-08-06 13:12 ` Willy Tarreau
2007-08-05 14:46 ` Theodore Tso
2007-08-05 17:55 ` Ingo Molnar
2007-08-05 17:59 ` Jeff Garzik
2007-08-05 18:09 ` Ingo Molnar
2007-08-05 18:08 ` Arjan van de Ven
2007-08-07 21:20 ` Bill Davidsen
2007-08-05 7:18 ` Ingo Molnar
2007-08-07 18:55 ` Bill Davidsen
2007-08-07 19:35 ` Alan Cox
2007-08-08 17:44 ` Bill Davidsen
2007-08-04 20:28 ` Ingo Molnar
2007-08-04 20:34 ` Arjan van de Ven
2007-08-04 21:03 ` Ingo Molnar
2007-08-04 21:51 ` Alan Cox
2007-08-05 7:21 ` Ingo Molnar
2007-08-05 7:29 ` Andrew Morton
2007-08-05 7:39 ` Ingo Molnar
2007-08-05 8:53 ` Willy Tarreau
2007-08-05 14:17 ` Jörn Engel
2007-08-05 18:02 ` Arjan van de Ven
2007-08-05 18:37 ` Jörn Engel
2007-08-05 20:21 ` Jörn Engel [this message]
2007-08-05 20:33 ` Andrew Morton
2007-08-05 12:47 ` Alan Cox
2007-08-05 12:56 ` Ingo Molnar
2007-08-05 18:44 ` Dave Jones
2007-08-05 18:58 ` adi
2007-08-06 6:39 ` Ingo Molnar
2007-08-06 15:59 ` Dave Jones
2007-08-06 16:16 ` Ingo Molnar
2007-08-05 7:37 ` Ingo Molnar
2007-08-05 9:04 ` Jeff Garzik
2007-08-05 12:43 ` Alan Cox
2007-08-05 12:54 ` Ingo Molnar
2007-08-05 13:37 ` Alan Cox
2007-08-05 18:08 ` Ingo Molnar
2007-08-05 19:11 ` Alan Cox
2007-08-08 18:22 ` Bill Davidsen
2007-08-08 19:39 ` Jeff Garzik
2007-08-08 20:31 ` Bill Davidsen
2007-08-08 23:18 ` Alan Cox
2007-08-07 19:09 ` Bill Davidsen
2007-08-04 21:48 ` Alan Cox
2007-08-05 7:13 ` Ingo Molnar
2007-08-05 13:22 ` Diego Calleja
2007-08-05 19:03 ` david
2007-08-06 6:52 ` Ingo Molnar
2007-08-10 4:04 ` Bill Davidsen
2007-08-11 5:19 ` Valdis.Kletnieks
2007-08-06 6:58 ` Ingo Molnar
2007-08-09 0:57 ` Greg Trounson
2007-08-09 1:26 ` david
2007-08-09 2:33 ` Andi Kleen
2007-08-04 22:39 ` Ilpo Järvinen
2007-08-05 10:20 ` Jakob Oestergaard
2007-08-05 10:42 ` Jeff Garzik
2007-08-05 10:58 ` Jakob Oestergaard
2007-08-05 12:46 ` Ingo Molnar
2007-08-05 13:46 ` Jakob Oestergaard
2007-08-05 16:45 ` Linus Torvalds
2007-08-05 19:09 ` Ingo Molnar
2007-08-05 19:22 ` [patch] implement smarter atime updates support Ingo Molnar
2007-08-05 19:28 ` [patch] implement smarter atime updates support, v2 Ingo Molnar
2007-08-05 20:42 ` Theodore Tso
2007-08-06 5:36 ` Ingo Molnar
2007-08-05 19:53 ` [patch] implement smarter atime updates support Arjan van de Ven
2007-08-05 20:04 ` Alan Cox
2007-08-05 20:22 ` Arjan van de Ven
2007-08-05 19:29 ` [PATCH 00/23] per device dirty throttling -v8 Alan Cox
2007-08-05 19:32 ` Ingo Molnar
2007-08-05 23:43 ` David Chinner
2007-08-05 0:26 ` Andi Kleen
2007-08-05 15:00 ` Theodore Tso
2007-08-06 13:47 ` Chris Mason
2007-08-17 0:45 ` Dave Jones
2007-08-05 20:41 ` Christoph Hellwig
2007-08-06 10:42 ` Andi Kleen
2007-08-16 10:18 ` Helge Hafting
2007-08-09 6:25 ` Lionel Elie Mamane
2007-08-09 15:02 ` Chuck Ebbert
2007-08-09 16:22 ` Diego Calleja
2007-08-04 16:41 ` Andrew Morton
2007-08-04 17:26 ` Nikita Danilov
2007-08-04 19:16 ` Florian Weimer
2007-08-05 6:00 ` Andrew Morton
2007-08-05 7:57 ` Florian Weimer
2007-08-05 20:43 ` Christoph Hellwig
2007-08-05 22:46 ` Theodore Tso
2007-08-06 0:24 ` David Chinner
2007-08-05 0:28 ` Andi Kleen
2007-08-04 16:15 ` Linus Torvalds
2007-08-05 17:22 ` Brice Figureau
2007-08-05 22:17 ` Andi Kleen
2007-08-06 8:40 ` Brice Figureau
2007-08-14 1:44 ` Stewart Smith
2007-08-14 2:25 ` Andi Kleen
2007-08-14 7:59 ` Brice Figureau
2007-08-06 20:26 ` Miklos Szeredi
2007-08-08 12:25 ` richard kennedy
2007-08-08 13:54 ` Andi Kleen
2007-08-10 4:17 ` Bill Davidsen
2007-08-10 16:00 pointman
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