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

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Message-ID: <45FB0148.6050700@rtr.ca>
Date:	Fri, 16 Mar 2007 16:42:48 -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?

Mark Lord wrote:
> John Coppens wrote:
>
>> 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.

Oh, wait a minute.. that's not the correct IRQ, is it?

Your ueagle-atm must be on this one:

 20:   90833792    3057782   IO-APIC-fasteoi   ohci_hcd:usb1

In which case, it's not likely to be an interrupt sharing issue.
Can you confirm this?

Also, try moving your ueagle-atm to one of the ehci usb ports
and see how that affects things.
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