From: Arnd Bergmann <arnd@arndb.de>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: akpm@osdl.org, "Evgeniy Polyakov" <johnpol@2ka.mipt.ru>,
"Albert Cahalan" <acahalan@gmail.com>, "Greg KH" <greg@kroah.com>,
"Jörn Engel" <joern@lazybastard.org>,
linux-kernel@vger.kernel.org, "Ingo Oeser" <ioe-lkml@rameria.de>,
linux-mtd@lists.infradead.org,
"Jan Engelhardt" <jengelh@linux01.gwdg.de>,
linux-fsdevel@vger.kernel.org,
"Thomas Gleixner" <tglx@linutronix.de>
Subject: Re: [PATCH] LogFS take three
Date: Thu, 17 May 2007 23:36:13 +0200 [thread overview]
Message-ID: <200705172336.14552.arnd@arndb.de> (raw)
In-Reply-To: <464CC209.4060500@cs.helsinki.fi>
On Thursday 17 May 2007, Pekka Enberg wrote:
>
> Jörn Engel wrote:
> > Compressing random data will actually enlarge it. If that happens I
> > simply store the verbatim uncompressed data instead and mark it as such.
> >
> > There is also demand for a user-controlled bit in the inode to disable
> > compression completely. All those .jpg, .mpg, .mp3, etc. just waste
> > time by trying and failing to compress them.
>
> So any sane way to enable compression is on per-inode basis which makes
> me still wonder why you need per-object compression.
1. it doesn't require user interaction, the file system will do the right
thing most of the time.
2. enlarging data is a very bad thing because it makes the behaviour
of the fs unpredictable. With uncompressed objects, you have a guaranteed
upper bound on the size.
Arnd <><
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: "Jörn Engel" <joern@lazybastard.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mtd@lists.infradead.org, akpm@osdl.org,
"Albert Cahalan" <acahalan@gmail.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Jan Engelhardt" <jengelh@linux01.gwdg.de>,
"Evgeniy Polyakov" <johnpol@2ka.mipt.ru>,
"Greg KH" <greg@kroah.com>, "Ingo Oeser" <ioe-lkml@rameria.de>
Subject: Re: [PATCH] LogFS take three
Date: Thu, 17 May 2007 23:36:13 +0200 [thread overview]
Message-ID: <200705172336.14552.arnd@arndb.de> (raw)
In-Reply-To: <464CC209.4060500@cs.helsinki.fi>
On Thursday 17 May 2007, Pekka Enberg wrote:
>
> Jörn Engel wrote:
> > Compressing random data will actually enlarge it. If that happens I
> > simply store the verbatim uncompressed data instead and mark it as such.
> >
> > There is also demand for a user-controlled bit in the inode to disable
> > compression completely. All those .jpg, .mpg, .mp3, etc. just waste
> > time by trying and failing to compress them.
>
> So any sane way to enable compression is on per-inode basis which makes
> me still wonder why you need per-object compression.
1. it doesn't require user interaction, the file system will do the right
thing most of the time.
2. enlarging data is a very bad thing because it makes the behaviour
of the fs unpredictable. With uncompressed objects, you have a guaranteed
upper bound on the size.
Arnd <><
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: "Jörn Engel" <joern@lazybastard.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mtd@lists.infradead.org, akpm@osdl.org,
"Albert Cahalan" <acahalan@gmail.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Jan Engelhardt" <jengelh@linux01.gwdg.de>,
"Evgeniy Polyakov" <johnpol@2ka.mipt.ru>,
"Greg KH" <greg@kroah.com>, "Ingo Oeser" <ioe-lkml@rameria.de>
Subject: Re: [PATCH] LogFS take three
Date: Thu, 17 May 2007 23:36:13 +0200 [thread overview]
Message-ID: <200705172336.14552.arnd@arndb.de> (raw)
In-Reply-To: <464CC209.4060500@cs.helsinki.fi>
On Thursday 17 May 2007, Pekka Enberg wrote:
>
> Jörn Engel wrote:
> > Compressing random data will actually enlarge it. If that happens I
> > simply store the verbatim uncompressed data instead and mark it as such.
> >
> > There is also demand for a user-controlled bit in the inode to disable
> > compression completely. All those .jpg, .mpg, .mp3, etc. just waste
> > time by trying and failing to compress them.
>
> So any sane way to enable compression is on per-inode basis which makes
> me still wonder why you need per-object compression.
1. it doesn't require user interaction, the file system will do the right
thing most of the time.
2. enlarging data is a very bad thing because it makes the behaviour
of the fs unpredictable. With uncompressed objects, you have a guaranteed
upper bound on the size.
Arnd <><
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next prev parent reply other threads:[~2007-05-17 21:37 UTC|newest]
Thread overview: 227+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 15:19 [PATCH] LogFS take three Jörn Engel
2007-05-15 15:19 ` Jörn Engel
2007-05-15 15:21 ` Review status (Re: [PATCH] LogFS take three) Jörn Engel
2007-05-15 15:21 ` Jörn Engel
2007-05-15 15:21 ` Jörn Engel
2007-05-17 16:03 ` Evgeniy Polyakov
2007-05-17 16:03 ` Evgeniy Polyakov
2007-05-17 16:03 ` Evgeniy Polyakov
2007-05-17 17:10 ` Jörn Engel
2007-05-17 17:10 ` Jörn Engel
2007-05-17 17:10 ` Jörn Engel
2007-05-20 17:30 ` Evgeniy Polyakov
2007-05-20 17:30 ` Evgeniy Polyakov
2007-05-20 17:30 ` Evgeniy Polyakov
2007-05-23 12:58 ` Jörn Engel
2007-05-23 12:58 ` Jörn Engel
2007-05-23 12:58 ` Jörn Engel
2007-05-23 15:07 ` Evgeniy Polyakov
2007-05-23 15:07 ` Evgeniy Polyakov
2007-05-23 15:07 ` Evgeniy Polyakov
2007-05-23 15:14 ` Jörn Engel
2007-05-23 15:14 ` Jörn Engel
2007-05-23 15:14 ` Jörn Engel
2007-05-23 15:53 ` Evgeniy Polyakov
2007-05-23 15:53 ` Evgeniy Polyakov
2007-05-23 15:53 ` Evgeniy Polyakov
2007-05-15 18:37 ` [PATCH] LogFS take three Sam Ravnborg
2007-05-15 18:37 ` Sam Ravnborg
2007-05-15 18:37 ` Sam Ravnborg
2007-05-15 19:10 ` Jörn Engel
2007-05-15 19:10 ` Jörn Engel
2007-05-15 19:10 ` Jörn Engel
2007-05-15 19:07 ` John Stoffel
2007-05-15 19:07 ` John Stoffel
2007-05-15 19:19 ` Jörn Engel
2007-05-15 19:19 ` Jörn Engel
2007-05-15 19:19 ` Jörn Engel
2007-05-16 4:54 ` David Woodhouse
2007-05-16 4:54 ` David Woodhouse
2007-05-16 4:54 ` David Woodhouse
2007-05-16 11:09 ` Jörn Engel
2007-05-16 11:09 ` Jörn Engel
2007-05-16 11:09 ` Jörn Engel
2007-05-16 11:34 ` Jamie Lokier
2007-05-16 11:34 ` Jamie Lokier
2007-05-16 11:34 ` Jamie Lokier
2007-05-16 11:38 ` Artem Bityutskiy
2007-05-16 11:38 ` Artem Bityutskiy
2007-05-16 11:38 ` Artem Bityutskiy
2007-05-16 12:25 ` Jamie Lokier
2007-05-16 12:25 ` Jamie Lokier
2007-05-16 12:25 ` Jamie Lokier
2007-05-16 12:49 ` Jörn Engel
2007-05-16 12:49 ` Jörn Engel
2007-05-16 12:49 ` Jörn Engel
2007-05-16 11:50 ` Jörn Engel
2007-05-16 11:50 ` Jörn Engel
2007-05-16 11:50 ` Jörn Engel
2007-05-16 12:06 ` CaT
2007-05-16 12:06 ` CaT
2007-05-16 12:06 ` CaT
2007-05-17 17:07 ` Jan Engelhardt
2007-05-17 17:07 ` Jan Engelhardt
2007-05-16 12:29 ` Evgeniy Polyakov
2007-05-16 12:29 ` Evgeniy Polyakov
2007-05-16 12:29 ` Evgeniy Polyakov
2007-05-16 12:55 ` Jörn Engel
2007-05-16 12:55 ` Jörn Engel
2007-05-16 12:55 ` Jörn Engel
2007-05-17 17:08 ` Jan Engelhardt
2007-05-17 17:08 ` Jan Engelhardt
2007-05-17 17:08 ` Jan Engelhardt
2007-05-16 13:41 ` John Stoffel
2007-05-16 13:41 ` John Stoffel
2007-05-16 13:53 ` Jörn Engel
2007-05-16 13:53 ` Jörn Engel
2007-05-16 13:53 ` Jörn Engel
2007-05-16 14:04 ` David Woodhouse
2007-05-16 14:04 ` David Woodhouse
2007-05-16 14:04 ` David Woodhouse
2007-05-16 14:13 ` Artem Bityutskiy
2007-05-16 14:13 ` Artem Bityutskiy
2007-05-16 14:13 ` Artem Bityutskiy
2007-05-16 14:17 ` Kevin Bowling
2007-05-16 14:17 ` Kevin Bowling
2007-05-17 9:12 ` Pavel Machek
2007-05-17 9:12 ` Pavel Machek
2007-05-17 9:12 ` Pavel Machek
2007-05-17 9:52 ` David Woodhouse
2007-05-17 9:52 ` David Woodhouse
2007-05-17 9:52 ` David Woodhouse
2007-05-19 15:00 ` Bill Davidsen
2007-05-19 15:00 ` Bill Davidsen
2007-05-16 14:29 ` CaT
2007-05-16 14:29 ` CaT
2007-05-17 17:14 ` Jan Engelhardt
2007-05-17 17:14 ` Jan Engelhardt
2007-05-17 17:14 ` Jan Engelhardt
2007-05-19 14:45 ` David Weinehall
2007-05-19 14:45 ` David Weinehall
2007-05-19 14:45 ` David Weinehall
2007-05-19 16:17 ` Jamie Lokier
2007-05-19 16:17 ` Jamie Lokier
2007-05-19 16:27 ` Evgeniy Polyakov
2007-05-19 16:27 ` Evgeniy Polyakov
2007-05-19 16:27 ` Evgeniy Polyakov
2007-05-17 16:59 ` Jan Engelhardt
2007-05-17 16:59 ` Jan Engelhardt
2007-05-17 16:59 ` Jan Engelhardt
2007-05-17 11:39 ` Arnd Bergmann
2007-05-17 11:39 ` Arnd Bergmann
2007-05-17 11:39 ` Arnd Bergmann
2007-05-15 20:37 ` Andrew Morton
2007-05-15 20:37 ` Andrew Morton
2007-05-16 0:06 ` Jörn Engel
2007-05-16 0:06 ` Jörn Engel
2007-05-16 0:06 ` Jörn Engel
2007-05-16 2:11 ` Jörn Engel
2007-05-16 2:11 ` Jörn Engel
2007-05-16 5:22 ` Willy Tarreau
2007-05-16 5:22 ` Willy Tarreau
2007-05-16 11:23 ` Jörn Engel
2007-05-16 11:23 ` Jörn Engel
2007-05-16 11:23 ` Jörn Engel
2007-05-17 17:26 ` Jan Engelhardt
2007-05-17 17:26 ` Jan Engelhardt
2007-05-17 17:26 ` Jan Engelhardt
2007-05-17 17:45 ` Evgeniy Polyakov
2007-05-17 17:45 ` Evgeniy Polyakov
2007-05-18 1:00 ` Kyle Moffett
2007-05-18 1:00 ` Kyle Moffett
2007-05-18 6:16 ` Jan Engelhardt
2007-05-18 6:16 ` Jan Engelhardt
2007-05-16 12:07 ` David Woodhouse
2007-05-16 12:07 ` David Woodhouse
2007-05-16 12:07 ` David Woodhouse
2007-05-16 15:34 ` Andrew Morton
2007-05-16 15:34 ` Andrew Morton
2007-05-16 15:49 ` David Woodhouse
2007-05-16 15:49 ` David Woodhouse
2007-05-16 16:41 ` Jörn Engel
2007-05-16 16:41 ` Jörn Engel
2007-05-16 16:41 ` Jörn Engel
[not found] ` <7fe698080705162312t4e7ed90byd10ef8e664027b17@mail.gmail.com>
2007-05-17 6:25 ` David Woodhouse
2007-05-17 6:25 ` David Woodhouse
2007-05-17 8:20 ` Dongjun Shin
2007-05-17 8:20 ` Dongjun Shin
2007-05-17 8:43 ` David Woodhouse
2007-05-17 8:43 ` David Woodhouse
2007-05-17 8:43 ` David Woodhouse
2007-05-17 12:05 ` Jörn Engel
2007-05-17 12:05 ` Jörn Engel
2007-05-17 12:05 ` Jörn Engel
2007-05-17 20:18 ` Pavel Machek
2007-05-17 20:18 ` Pavel Machek
2007-05-18 0:01 ` Dongjun Shin
2007-05-18 0:01 ` Dongjun Shin
2007-05-18 6:17 ` Jan Engelhardt
2007-05-18 6:17 ` Jan Engelhardt
2007-05-18 6:47 ` David Woodhouse
2007-05-18 6:47 ` David Woodhouse
2007-05-19 15:18 ` Bill Davidsen
2007-05-19 15:18 ` Bill Davidsen
2007-05-19 6:15 ` Rob Landley
2007-05-19 6:15 ` Rob Landley
2007-05-19 9:24 ` Jan Engelhardt
2007-05-19 9:24 ` Jan Engelhardt
2007-05-19 17:26 ` Rob Landley
2007-05-19 17:26 ` Rob Landley
2007-05-15 23:26 ` Albert Cahalan
2007-05-15 23:26 ` Albert Cahalan
2007-05-16 0:09 ` Jörn Engel
2007-05-16 0:09 ` Jörn Engel
2007-05-16 0:09 ` Jörn Engel
2007-05-16 11:18 ` Jamie Lokier
2007-05-16 11:18 ` Jamie Lokier
2007-05-16 11:18 ` Jamie Lokier
2007-05-16 12:08 ` Pekka Enberg
2007-05-16 12:08 ` Pekka Enberg
2007-05-16 12:58 ` Jörn Engel
2007-05-16 12:58 ` Jörn Engel
2007-05-16 12:58 ` Jörn Engel
2007-05-16 2:37 ` Roland Dreier
2007-05-16 2:37 ` Roland Dreier
2007-05-16 11:35 ` Jörn Engel
2007-05-16 11:35 ` Jörn Engel
2007-05-16 11:35 ` Jörn Engel
2007-05-16 10:21 ` Pekka J Enberg
2007-05-16 10:21 ` Pekka J Enberg
2007-05-16 12:26 ` Jörn Engel
2007-05-16 12:26 ` Jörn Engel
2007-05-16 12:36 ` Pekka Enberg
2007-05-16 12:36 ` Pekka Enberg
2007-05-16 12:36 ` Pekka Enberg
2007-05-16 12:38 ` Pekka Enberg
2007-05-16 12:38 ` Pekka Enberg
2007-05-16 13:20 ` Jörn Engel
2007-05-16 13:20 ` Jörn Engel
2007-05-16 13:20 ` Jörn Engel
2007-05-17 20:58 ` Pekka Enberg
2007-05-17 20:58 ` Pekka Enberg
2007-05-17 20:58 ` Pekka Enberg
2007-05-17 21:36 ` Arnd Bergmann [this message]
2007-05-17 21:36 ` Arnd Bergmann
2007-05-17 21:36 ` Arnd Bergmann
2007-05-17 21:50 ` Jörn Engel
2007-05-17 21:50 ` Jörn Engel
2007-05-17 21:50 ` Jörn Engel
2007-05-16 19:17 ` Pavel Machek
2007-05-16 19:17 ` Pavel Machek
2007-05-16 19:23 ` Jörn Engel
2007-05-16 19:23 ` Jörn Engel
2007-05-16 19:23 ` Jörn Engel
2007-05-17 15:08 ` Arnd Bergmann
2007-05-17 15:08 ` Arnd Bergmann
2007-05-17 15:08 ` Arnd Bergmann
2007-05-17 20:21 ` Jörn Engel
2007-05-17 20:21 ` Jörn Engel
2007-05-17 20:21 ` Jörn Engel
2007-05-17 21:00 ` Arnd Bergmann
2007-05-17 21:00 ` Arnd Bergmann
2007-05-17 21:00 ` Arnd Bergmann
2007-05-17 21:30 ` Jörn Engel
2007-05-17 21:30 ` Jörn Engel
2007-05-17 22:01 ` Jamie Lokier
2007-05-17 22:01 ` Jamie Lokier
2007-05-17 22:01 ` Jamie Lokier
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