From: Peter Samuelson <peter@cadcamlab.org>
To: LA Walsh <law@sgi.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: IDE0 /dev/hda performance hit in 2217 on my HW
Date: Mon, 13 Nov 2000 23:33:57 -0600 [thread overview]
Message-ID: <20001113233357.H18203@wire.cadcamlab.org> (raw)
In-Reply-To: <NBBBJGOOMDFADJDGDCPHIEJDCJAA.law@sgi.com>
In-Reply-To: <NBBBJGOOMDFADJDGDCPHIEJDCJAA.law@sgi.com>; from law@sgi.com on Mon, Nov 13, 2000 at 01:52:37PM -0800
[Linda Walsh]
> Under 2217, the xfer speed drops to near 1,000K/s. This is for both
> 'badblocks'
> and a 'dd' if=/dev/hda of=/dev/hdb bs=256k. In both instances, I notice
> a near 90% performance degredation.
Off the top of my head it sounds like you are using the wrong ide i/o
mode. Your hardware probably supports UDMA66 but you are getting one
of the old PIO modes by default. What chipset does the Inspiron 7500
use? (Probably Intel something. Dell loves Intel.)
A short session with 'hdparm' will confirm or refute this theory.
Andre Hedrick's IDE patch reportedly does a much better job of
supporting and auto-configuring modern chipsets than vanilla 2.2.
http://www.??.kernel.org/pub/linux/kernel/people/hedrick/
Peter
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next prev parent reply other threads:[~2000-11-14 6:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-13 21:52 LA Walsh
2000-11-14 5:33 ` Peter Samuelson [this message]
2000-11-14 5:57 ` Peter Samuelson
2000-11-14 14:18 ` Mike Dresser
2000-11-14 18:55 ` LA Walsh
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