From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ondrej Zary <linux@rainbow-software.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Grant Coady <grant_lkml@dodo.com.au>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Odd IDE performance drop 2.4 vs 2.6?
Date: Fri, 17 Jun 2005 13:40:56 +0100 [thread overview]
Message-ID: <1119012053.27908.87.camel@localhost.localdomain> (raw)
In-Reply-To: <42B07E5D.9070004@rainbow-software.org>
On Mer, 2005-06-15 at 20:15, Ondrej Zary wrote:
> Now I've tested it with preempt disabled and nothing has changed. When
> fiddling around with hdparm, I got about 16MB/s max. with 2.6.12-rc5.
> With 2.4.31, I got about 21MB/s when just the DMA was enabled
> (read-ahead and multcount set to 0 - changing them does not make almost
> any difference).
multcount is only used for PIO so that would be expected. Similarly the
block readahead should matter but not anything drive level.
If you compare the hdparm data are both 2.4 and 2.6 selecting the same
IDE modes ?
next prev parent reply other threads:[~2005-06-17 12:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-13 4:03 Odd IDE performance drop 2.4 vs 2.6? Grant Coady
2005-06-13 10:43 ` Ondrej Zary
2005-06-13 13:39 ` Alan Cox
2005-06-13 14:06 ` Nick Piggin
2005-06-13 15:09 ` Alan Cox
2005-06-13 17:01 ` Ondrej Zary
2005-06-13 20:25 ` Jens Axboe
2005-06-14 2:20 ` Nick Piggin
2005-06-15 19:15 ` Ondrej Zary
2005-06-17 12:40 ` Alan Cox [this message]
2005-06-17 13:43 ` Ondrej Zary
2005-06-13 18:13 ` Grant Coady
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