linux-kernel - Re: IRQ splitting

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Message-id: <46150913.4000406@shaw.ca>
Date:	Thu, 05 Apr 2007 08:34:59 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: IRQ splitting

Jan Engelhardt wrote:
> Hello list,
> 
> 
> 
> let's take the following /proc/interrupts dump (CPU2,CPU3 trimmed)...
> 
>            CPU0       CPU1
>   0:   37041766   37038991  IO-APIC-edge  timer
>   1:         10          2  IO-APIC-edge  i8042
>   8:          0          0  IO-APIC-edge  rtc
>   9:          0          0  IO-APIC-level  acpi
>  12:        114          0  IO-APIC-edge  i8042
>  14:      25219    5800049  IO-APIC-edge  ide0
> 201:     260381     238454  IO-APIC-level  aacraid
> 209:          0          0  IO-APIC-level  ohci_hcd:usb1
> 217:          0          0  IO-APIC-level  ehci_hcd:usb2
> 225:   57531742          0  IO-APIC-level  eth0,radeon@pci:0000:03:00.0
> 233:         26          0  IO-APIC-level  eth1
> NMI:       1661       1397
> LOC:  147579966  147579949
> ERR:          0
> MIS:          0
> 
> My question is whether it is possible that eth0's interrupts go to CPU0
> and radeon's to CPU1, and if so, how I would enable that. Alternatively,
> is it possible to just move eth0 or radeon to a different interrupt?

Generally (at least in APIC mode) the IRQ assignments are based on 
hard-wired interrupt lines on the board. In this case, the slots that 
the Radeon and eth0 card are in likely share a physical interrupt line 
and there is no way to separate them in software. You can try moving the 
  card(s) to different slots..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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