From: "Jörn Engel" <joern@logfs.org>
To: Maxim Shchetynin <maxim@linux.vnet.ibm.com>
Cc: linux-fsdevel@vger.kernel.org,
Jan Engelhardt <jengelh@medozas.de>,
Matthew Wilcox <matthew@wil.cx>,
linux-kernel@vger.kernel.org
Subject: Re: AZFS file system proposal
Date: Tue, 17 Jun 2008 16:45:26 +0200 [thread overview]
Message-ID: <20080617144526.GA28448@logfs.org> (raw)
In-Reply-To: <20080617160628.79efd2d9@mercedes-benz.boeblingen.de.ibm.com>
On Tue, 17 June 2008 16:06:28 +0200, Maxim Shchetynin wrote:
> >
> > My personal question when looking at this is: Why not use ext2? It
>
> Same reason we don't use ext2 for file system in RAM - we don't need any expensive caching and readahead mechanisms for devices which are as fast as main memory (or almost as fast).
Well, with the '-o xip' option I mentioned below, there is no caching or
readahead. The direct_access method you use as well was developed for
ext2. Or rather for xip2fs, another new filesystem. After some review,
that was shot down and a mount option was added to ext2 instead.
> > appears to me that an ext2 mounted with '-o xip' would solve the same
> > problems.
Jörn
--
Homo Sapiens is a goal, not a description.
-- unknown
WARNING: multiple messages have this Message-ID (diff)
From: "Jörn Engel" <joern@logfs.org>
To: Maxim Shchetynin <maxim@linux.vnet.ibm.com>
Cc: linux-fsdevel@vger.kernel.org,
Jan Engelhardt <jengelh@medozas.de>,
Matthew Wilcox <matthew@wil.cx>,
linux-kernel@vger.kernel.org
Subject: Re: AZFS file system proposal
Date: Tue, 17 Jun 2008 16:45:26 +0200 [thread overview]
Message-ID: <20080617144526.GA28448@logfs.org> (raw)
In-Reply-To: <20080617160628.79efd2d9@mercedes-benz.boeblingen.de.ibm.com>
On Tue, 17 June 2008 16:06:28 +0200, Maxim Shchetynin wrote:
> >
> > My personal question when looking at this is: Why not use ext2? It
>
> Same reason we don't use ext2 for file system in RAM - we don't need any expensive caching and readahead mechanisms for devices which are as fast as main memory (or almost as fast).
Well, with the '-o xip' option I mentioned below, there is no caching or
readahead. The direct_access method you use as well was developed for
ext2. Or rather for xip2fs, another new filesystem. After some review,
that was shot down and a mount option was added to ext2 instead.
> > appears to me that an ext2 mounted with '-o xip' would solve the same
> > problems.
Jörn
--
Homo Sapiens is a goal, not a description.
-- unknown
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next prev parent reply other threads:[~2008-06-17 14:45 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-09 8:46 AZFS file system proposal Maxim Shchetynin
2008-06-09 8:46 ` Maxim Shchetynin
2008-06-09 12:55 ` Matthew Wilcox
2008-06-10 8:49 ` Maxim Shchetynin
2008-06-10 8:49 ` Maxim Shchetynin
2008-06-10 22:02 ` Jan Engelhardt
2008-06-17 9:06 ` Maxim Shchetynin
2008-06-17 9:06 ` Maxim Shchetynin
2008-06-17 9:35 ` Jan Engelhardt
2008-06-17 10:53 ` Jörn Engel
2008-06-17 10:53 ` Jörn Engel
2008-06-17 14:06 ` Maxim Shchetynin
2008-06-17 14:06 ` Maxim Shchetynin
2008-06-17 14:45 ` Jörn Engel [this message]
2008-06-17 14:45 ` Jörn Engel
2008-06-17 11:57 ` Maxim Shchetynin
2008-06-17 11:57 ` Maxim Shchetynin
2008-06-17 14:36 ` Jan Engelhardt
2008-06-17 15:51 ` Jörn Engel
2008-06-17 15:51 ` Jörn Engel
2008-06-18 11:15 ` Maxim Shchetynin
2008-06-18 11:15 ` Maxim Shchetynin
2008-06-18 20:56 ` Jörn Engel
2008-06-18 11:21 ` Maxim Shchetynin
2008-06-18 11:21 ` Maxim Shchetynin
2008-06-17 15:02 ` Dmitri Vorobiev
2008-06-18 14:01 ` Maxim Shchetynin
2008-06-18 14:01 ` Maxim Shchetynin
2008-06-18 11:27 ` Christoph Hellwig
2008-06-18 14:03 ` Maxim Shchetynin
-- strict thread matches above, loose matches on Subject: below --
2008-06-18 14:06 Maxim Shchetynin
2008-06-18 14:06 ` Maxim Shchetynin
2008-07-01 14:59 ` Arnd Bergmann
2008-07-01 14:59 ` Arnd Bergmann
2008-07-07 15:39 ` Maxim Shchetynin
2008-07-07 15:39 ` Maxim Shchetynin
2008-07-07 15:39 ` Maxim Shchetynin
2008-07-08 14:42 ` Arnd Bergmann
2008-07-08 14:42 ` Arnd Bergmann
2008-07-08 14:42 ` Arnd Bergmann
2008-07-09 6:48 ` Benjamin Herrenschmidt
2008-07-09 6:48 ` Benjamin Herrenschmidt
2008-07-09 8:58 ` Benjamin Herrenschmidt
2008-07-09 8:58 ` Benjamin Herrenschmidt
2008-07-09 9:14 ` Maxim Shchetynin
2008-07-09 9:14 ` Maxim Shchetynin
2008-07-09 9:14 ` Maxim Shchetynin
2008-07-09 9:23 ` Benjamin Herrenschmidt
2008-07-09 10:58 ` Maxim Shchetynin
2008-07-09 10:58 ` Maxim Shchetynin
2008-07-09 10:58 ` Maxim Shchetynin
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