From: Ryan Cumming <bodnar42@phalynx.dhs.org>
To: Jeff Dike <jdike@karaya.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Special Kernel Modification
Date: Sun, 4 Nov 2001 21:30:38 -0800 [thread overview]
Message-ID: <E160cLH-0001Nw-00@localhost> (raw)
In-Reply-To: <200111050552.AAA06451@ccure.karaya.com>
In-Reply-To: <200111050552.AAA06451@ccure.karaya.com>
On November 4, 2001 21:52, you wrote:
> bodnar42@phalynx.dhs.org said:
> > > Mounting it synchronous will disable caching in the VM.
> >
> > Who told
> > you that? Synchronous mounting turns off write buffering. Even with
> > "-o sync" writes will still end up in the page cache, they'll just be
> > commited immediately.
>
> Ummm, how about O_DIRECT instead of O_SYNC (or maybe as well, my googling
> hasn't been clear on whether O_DIRECT bypasses the cache on writes as
> well)?
>
Nope, last I checked O_DIRECT enforces buffer and file offset alignment.
Normal apps wouldn't work very well at all. Maybe UML needs some hacks around
the whole caching issue?
-Ryan
next prev parent reply other threads:[~2001-11-05 5:31 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-05 0:01 Special Kernel Modification Lonnie Cumberland
2001-11-05 0:19 ` Ryan Cumming
2001-11-05 0:29 ` lonnie
2001-11-05 1:04 ` Jan-Benedict Glaw
2001-11-05 3:04 ` Mike Fedyk
2001-11-06 0:34 ` Jorgen Cederlof
2001-11-06 0:38 ` lonnie
2001-11-05 0:22 ` Alan Cox
2001-11-05 0:39 ` Phil Sorber
2001-11-05 0:38 ` Rik van Riel
2001-11-05 1:04 ` Jeremy Jackson
2001-11-05 1:58 ` Jeff Dike
2001-11-05 2:14 ` Ryan Cumming
2001-11-05 4:02 ` Jeff Dike
2001-11-05 3:13 ` Ryan Cumming
2001-11-05 5:52 ` Jeff Dike
2001-11-05 5:30 ` Ryan Cumming [this message]
2001-11-05 14:22 ` Jeff Dike
2001-11-05 16:53 ` Andrea Arcangeli
2001-11-05 20:18 ` Jeff Dike
2001-11-05 19:05 ` Andrea Arcangeli
2001-11-05 0:37 John Weber
[not found] <E160aCK-0001Fs-00@localhost.suse.lists.linux.kernel>
[not found] ` <200111050552.AAA06451@ccure.karaya.com.suse.lists.linux.kernel>
2001-11-05 6:22 ` Andi Kleen
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