From: Andrew Morton <akpm@digeo.com>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: mru@users.sourceforge.net, linux-kernel@vger.kernel.org,
alan@lxorguk.ukuu.org.uk
Subject: Re: DMA transfers in 2.5.67
Date: Wed, 16 Apr 2003 03:11:44 -0700 [thread overview]
Message-ID: <20030416031144.613b0cc7.akpm@digeo.com> (raw)
In-Reply-To: <200304160548_MC3-1-349F-E844@compuserve.com>
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.
next prev parent reply other threads:[~2003-04-16 9:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-16 9:45 Chuck Ebbert
2003-04-16 10:11 ` Andrew Morton [this message]
2003-04-16 10:13 ` Andrew Morton
2003-04-16 10:13 ` Måns Rullgård
-- strict thread matches above, loose matches on Subject: below --
2003-04-18 11:25 Chuck Ebbert
2003-04-15 20:01 Måns Rullgård
2003-04-15 20:31 ` Alan Cox
2003-04-15 21:38 ` Måns Rullgård
2003-04-15 20:48 ` Alan Cox
2003-04-15 22:09 ` Måns Rullgård
2003-04-16 8:36 ` Ivan Kokshaysky
2003-04-16 8:43 ` Måns Rullgård
2003-04-16 8:59 ` Måns Rullgård
2003-04-16 9:30 ` Måns Rullgård
2003-04-16 10:01 ` Ivan Kokshaysky
2003-04-16 10:11 ` Måns Rullgård
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