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Date: Wed, 01 Jun 2005 20:30:23 +0200
From: Rene Herman <rene.herman@keyaccess.nl>
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To: Mark Lord <lkml@rtr.ca>
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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Mark Lord wrote:

> 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.

No, that's not it. Both ide0 (14) and EHCI (3) are on private, unshared 
IRQs. rmmodding ehci_hcd as per Pavel's sugestion gets me back my speed. 
Exactly _why_ I've no idea though. I've just added you to the CC on that 
reply...

Rene.