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Re: direct-IO writes strange behavior

To: Andrew Morton <akpm@xxxxxxxx>
Subject: Re: direct-IO writes strange behavior
From: Nathan Scott <nathans@xxxxxxx>
Date: Fri, 28 Nov 2003 08:18:27 +1100
Cc: Alberto Nava <beto@xxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <20031127004420.77f31a9c.akpm@xxxxxxxx>
References: <3FBECF7E.6010509@xxxxxxxxxxx> <3FBFEF6A.3000609@xxxxxxxxxxx> <20031127004420.77f31a9c.akpm@xxxxxxxx>
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hi Andrew,

On Thu, Nov 27, 2003 at 12:44:20AM -0800, Andrew Morton wrote:
> Alberto Nava <beto@xxxxxxxxxxx> wrote:
> >
> > I've done some more digging on this issue. The reason the
> >  request is going in 4k pages is that the direct-io code is
> >  giving up in do_direct_IO() and the request is issued as buffer IO :-(.
> You seem to be using a -mm kernel.  It has extensive and not-quite-complete
> and not-really-tested-at-all-with-XFS direct-io changes.

Alberto's original mail said:

> I'm seeing a very strange behavior when I write to a file using 512k
> direct-io writes. The filesystem is XFS and the kernel is 2.6.0-test9.



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