From: Brian <hiryuu@envisiongames.net>
To: Krzysztof Oledzki <ole@ans.pl>, linux-kernel@vger.kernel.org
Subject: Re: Two hdds on one channel - why so slow?
Date: Tue, 01 Jan 2002 18:07:37 -0500 [thread overview]
Message-ID: <0GPA00BK988OBK@mtaout45-01.icomcast.net> (raw)
In-Reply-To: <Pine.LNX.4.33.0201012330380.8078-100000@dark.pcgames.pl>
In-Reply-To: <Pine.LNX.4.33.0201012330380.8078-100000@dark.pcgames.pl>
This is an inherent quirk (SCSI folks would say brain damage) in IDE.
Only one drive on an IDE chain may be accessed at once and only one
request may go to that drive at a time. Therefore, the maximum you could
hope for in that test is half speed on each. Throw in the overhead of
continuously hopping between them and 12MB is no surprise.
That is why even cheapo Compaqs and Gateways have the hard drive and
CD-ROM on separate chains. It's also why IDE RAID cards have a separate
connector for each drive.
-- Brian
On Tuesday 01 January 2002 05:34 pm, Krzysztof Oledzki wrote:
> Hello,
>
> There is something wrong with ide data throughput with at last both via
> kt133 and promise pcd20265 controllers.
>
> I have Asus A7V-133 Mobo with VIA KT133A chipset and onboard Promise
> pcd20265 ide controller. My CPU is Athlon 1400 MHz and I have 512 MB of
> PC133 SDRAM. I noticed that connecting two ata100 hdds into the same
> channel makes everything much slower. So I made some test:
next prev parent reply other threads:[~2002-01-01 23:08 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-01 22:34 Krzysztof Oledzki
2002-01-01 23:07 ` Brian [this message]
2002-01-01 23:32 ` Andre Hedrick
2002-01-02 0:52 ` H. Peter Anvin
2002-01-02 1:19 ` Benjamin LaHaise
2002-01-02 1:24 ` H. Peter Anvin
2002-01-02 2:03 ` Benjamin LaHaise
2002-01-02 4:13 ` Andre Hedrick
2002-01-02 17:21 ` Krzysztof Oledzki
2002-01-02 18:41 ` Vojtech Pavlik
2002-01-02 19:31 ` Andre Hedrick
2002-01-02 20:23 ` Brian
2002-01-02 23:30 ` Ricky Beam
2002-01-03 1:52 ` Mark Hahn
2002-01-03 5:57 ` Ricky Beam
2002-01-04 2:54 ` Petro
2002-01-04 3:04 ` Arnaldo Carvalho de Melo
2002-01-04 4:29 ` ASUS KT266A/VT8233 board and UDMA setting Dmitri Pogosyan
2002-01-04 9:25 ` Vojtech Pavlik
2002-01-04 10:35 ` Alan Cox
2002-01-04 10:28 ` Vojtech Pavlik
2002-01-04 11:20 ` Alan Cox
2002-01-04 13:37 ` Ville Herva
2002-01-04 16:48 ` David Rees
2002-01-04 17:00 ` Alan Cox
2002-01-05 19:20 ` Dmitri Pogosyan
2002-01-05 7:20 ` Dmitri Pogosyan
2002-01-07 8:11 ` Two hdds on one channel - why so slow? Stevie O
2002-01-07 15:57 ` Thomas Molina
2002-01-07 16:14 ` Ricky Beam
2002-01-07 16:40 ` Thomas Molina
2002-01-07 22:23 ` Ancient Memories [was: Two hdds on one channel - why so slow?] Edesio Costa e Silva
2002-01-07 23:18 ` M. Edward (Ed) Borasky
2002-01-07 18:48 ` Two hdds on one channel - why so slow? Andre Hedrick
2002-01-07 20:19 ` Petro
2002-01-07 22:31 ` Dmitri Pogosyan
2002-01-08 13:50 ` Alan Cox
2002-01-08 14:45 ` Mike Dresser
2002-01-08 14:57 ` James A Sutherland
2002-01-08 17:15 ` Wakko Warner
2002-01-04 18:19 ` Stephan von Krawczynski
2002-01-04 18:30 ` Stephan von Krawczynski
2002-01-04 18:38 ` Alan Cox
2002-01-05 0:52 ` J.A. Magallon
2002-01-05 9:41 ` Nick Holloway
2002-01-05 12:04 ` Henning P. Schmiedehausen
2002-01-05 1:28 ` Andre Hedrick
2002-01-08 23:59 ` Ricky Beam
2002-01-09 0:10 ` Mark Hahn
2002-01-09 15:27 ` Andre Hedrick
2002-01-09 16:25 ` MTBF Was: " Richard B. Johnson
2002-01-08 23:46 ` Ricky Beam
2002-01-02 21:23 ` Jeffrey W. Baker
2002-01-03 15:49 Dana Lacoste
2002-01-03 16:44 ` Mark Hahn
[not found] <Pine.LNX.4.33.0201021452120.8693-100000@coffee.psychology.mcmaster.ca>
2002-01-04 9:28 ` Krzysztof Oledzki
2002-01-04 14:02 Jesse Pollard
2002-01-04 16:33 ` Bernd Eckenfels
[not found] ` <Pine.LNX.4.43.0201041154010.14678-100000@filesrv1.baby-dragons.com>
2002-01-04 17:14 ` Bernd Eckenfels
2002-01-04 17:22 ` Timothy Covell
2002-01-04 18:40 ` Bernd Eckenfels
2002-01-04 19:32 ` Jeffrey W. Baker
2002-01-05 12:02 ` Henning P. Schmiedehausen
2002-01-04 20:29 ` Timothy Covell
2002-01-08 23:49 ` Ricky Beam
2002-01-09 0:50 ` Timothy Covell
2002-01-09 1:22 ` Ricky Beam
2002-01-04 17:40 ` Jesse Pollard
2002-01-08 12:41 ` Rob Landley
2002-01-08 21:18 ` William Park
2002-01-09 10:56 ` Rob Landley
2002-01-09 19:50 ` William Park
[not found] <Pine.LNX.4.33.0201040844130.14385-100000@coffee.psychology.mcmaster.ca>
2002-01-04 17:18 ` Krzysztof Oledzki
2002-01-04 19:29 Dana Lacoste
2002-01-05 11:58 ` Henning P. Schmiedehausen
2002-01-05 12:20 ` Petro
2002-01-09 0:04 ` Ricky Beam
2002-01-07 17:06 Jesse Pollard
2002-01-07 17:17 ` Tommy Reynolds
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