linux-kernel - Re: Conflict between ide and usb?

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Message-ID: <45FAFCD9.5060207@rtr.ca>
Date:	Fri, 16 Mar 2007 16:23:53 -0400
From:	Mark Lord <lkml@....ca>
To:	John Coppens <john@...ppens.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Conflict between ide and usb?

John Coppens wrote:
> Hi all.
> 
> I installed ueagle-atm, which, by itself, is working fine with an 
> MT-810 modem.
> 
> The problem I have, is that when I copy a file from a DVD to harddisk,
> the internet connection almost dies (it slows down terribly, so much so
> that established connections actually disconnect, ping looses packets,
> DNS lookup fails, etc). After copy ends, all returns to normal.
> 
> The machine is an AMD64, still in x86 mode though. CPU activity is very
> low during the copy, so it's not a CPU problem. Kernel is 2.6.20.2. APIC
> is enabled. No error message found in either /var/log/messages or syslog.
> DVD and HD are on different IDE interfaces.
> 
> Can anyone suggest where to start looking for a solution?
..
>  16:       2591    1737056   IO-APIC-fasteoi   libata, HDA Intel
>  17:         41          1   IO-APIC-fasteoi   libata, ehci_hcd:usb2
..

It pretty much has to be an IRQ sharing issue,
most likely in the USB driver side of the house.

I don't know enough about the USB drivers really,
but the interrupt routine inside the ueagle-atm.c file
doesn't seem too "sharing friendly".  But perhaps that
part is handled by the layers above (?).

That's where I'd start looking if I were you.

-ml
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