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Date: Wed, 6 Aug 2003 12:17:59 -0700
From: Andrew Morton <akpm@osdl.org>
To: RaTao <ratao@toxyn.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: linux-2.6.0-linux-kernel@vger.kernel.orgtest2-mm4 O_DIRECT
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RaTao <ratao@toxyn.org> wrote:
>
> 
> Hi!
> 
> While testing linux-2.6.0-test2-mm4 I noticed two things:
> 
> - O_DIRECT doesn't work, at least in ext3, with block size different 
> from filesystem's blocksize. (It doesn't work with 512 bs, at least).
> This works in 2.6.0-test2, from 512 to 4096.

It works OK here.

> - vmstat doesn't show bi/bo for O_DIRECT's disk access.

It does here.


I'd be suspecting your test app: is it checking the return value of all
syscalls?