From: mru@users.sourceforge.net (Måns Rullgård)
To: Andrew Morton <akpm@digeo.com>
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk
Subject: Re: DMA transfers in 2.5.67
Date: 16 Apr 2003 12:13:09 +0200 [thread overview]
Message-ID: <yw1xwuhuda2y.fsf@zaphod.guide> (raw)
In-Reply-To: <20030416031144.613b0cc7.akpm@digeo.com>
Andrew Morton <akpm@digeo.com> writes:
> > # 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.
That was reading a file discarding that data. A sync shouldn't make
any difference.
--
Måns Rullgård
mru@users.sf.net
next prev parent reply other threads:[~2003-04-16 10:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-16 9:45 DMA transfers in 2.5.67 Chuck Ebbert
2003-04-16 10:11 ` Andrew Morton
2003-04-16 10:13 ` Andrew Morton
2003-04-16 10:13 ` Måns Rullgård [this message]
-- 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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