From mboxrd@z Thu Jan  1 00:00:00 1970
From: Erik Slagter <erik@slagter.name>
Subject: Re: [git patches] IDE update
Date: Fri, 08 Jul 2005 13:37:42 +0200
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To: Grant Coady <grant_lkml@dodo.com.au>
Cc: Mark Lord <liml@rtr.ca>, Jens Axboe <axboe@suse.de>, Ondrej Zary <linux@rainbow-software.org>, =?ISO-8859-1?Q?Andr=E9?= Tomt <andre@tomt.net>, Al Boldi <a1426z@gawab.com>, 'Bartlomiej Zolnierkiewicz' <bzolnier@gmail.com>, 'Linus Torvalds' <torvalds@osdl.org>, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org


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On Fri, 2005-07-08 at 10:06 +1000, Grant Coady wrote:

> I've not been able to get dual channel I/O speed faster than single=20
> interface speed, either as 'md' RAID0 or simultaneous reading or=20
> writing done the other day:
>=20
> Time to write or read 500MB file:
>=20
> >summary		2.4.31-hf1	2.6.12.2
> >boxen \ time ->	 w 	 r	 w	 r
> >---------------	----	----	----	----
> ...
> >peetoo			33	20	26.5	22
> >(simultaneuous		57	37.5	52	38.5)
>=20
> MB/s		2.4.31-hf1	2.6.12.2
> 		w	r	w	r
> single		15	25	19	23
> dual		17.5	27	19	26
>=20
> These timings show very little happening in parallel, is that normal?

"me too" ;-)

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