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Date: Wed, 01 Jun 2005 07:48:57 -0400
From: Mark Lord <lkml@rtr.ca>
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To: Rene Herman <rene.herman@keyaccess.nl>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: External USB2 HDD affects speed hda
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Look at "cat /proc/interrupts" and see if the USB is sharing
an IRQ line with ide0.  If so, then the best explanation I can
see is that the USB driver must have a *really slow* interrupt
handler up to the point where it determines that the interrupt
is not for it.

-ml