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Date: Wed, 16 Apr 2003 03:13:03 -0700
From: Andrew Morton <akpm@digeo.com>
To: 76306.1226@compuserve.com, mru@users.sourceforge.net,
       linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk
Subject: Re: DMA transfers in 2.5.67
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Andrew Morton <akpm@digeo.com> wrote:
>
> Chuck Ebbert <76306.1226@compuserve.com> wrote:
> >
> > # mount /ext3_fs
> > # time dd if=/ext3_fs/100MiB_file of=/dev/null bs=32k
> > 
> >   2.4.20aa1 : 3.3 sec (exactly what I expect to see)
> >   2.5.66    : 6.6 sec
> 
> With this test 2.4 will leave a lot more unwritten dirty data in memory.
> 
> You should include a `sync' in the timings.

Well you should include the sync if you're writing to disk ;)

doh.