Subject: [linux-audio-dev] mr tweedie will be our hero
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: Fri May 19 2000 - 05:08:22 EEST
From the linux-kernel list. O_DIRECT, for those who don't know, is a
way of (more-or-less) getting raw disk i/o access to files in a real
filesystem, instead of the current raw i/o system which leaves your
data in some not-easily-decipherable layout on a partition.
--p
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From: "Stephen C. Tweedie" <sct_AT_redhat.com>
Date: Thu, 18 May 2000 08:44:04 +0100
Subject: Re: Can O_SYNC be implemented by using fsync?
Hi,
On Mon, May 15, 2000 at 07:05:55PM -0600, Jeff V. Merkey wrote:
>
> Also, Van mentioned the issue with double-caching. Since Oracle uses
> it's own cache, the current buffer cache implementation in Linux for
> O_SYNC obsolutley sucks for Oracle, since we will always be double
> buffering data. I mentioned to Alan having a directFS layer in Linux,
> where Oracle could talk to files in a way that would completely by-pass
> the Linux buffer cache. Given the current state of Linux and the file
> systems, this may be very difficult to support.
I will do O_DIRECT for Linux. It's not massively hard, given the
current VFS infrastructure. The VM support necessary for zero-copy
I/O is already there for the raw device I/O code.
- --Stephen
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