Re: Conflict between ide and usb?

[Mark Lord <lkml@rtr.ca>]

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