From: Stephen Hemminger <shemminger@linux-foundation.org>
To: linux-kernel@vger.kernel.org
Subject: Re: IRQ splitting
Date: Thu, 5 Apr 2007 12:23:41 -0700 [thread overview]
Message-ID: <20070405122341.482f5e26@freekitty> (raw)
In-Reply-To: 46150913.4000406@shaw.ca
On Thu, 05 Apr 2007 08:34:59 -0600
Robert Hancock <hancockr@shaw.ca> wrote:
> 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..
>
If the radeon and/or the Ethernet driver support MSI, that would split
out the IRQ's as well.
--
Stephen Hemminger <shemminger@linux-foundation.org>
next prev parent reply other threads:[~2007-04-05 19:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.21iotKLTgoLpkKhrbSxrjy5v7hM@ifi.uio.no>
2007-04-05 14:34 ` IRQ splitting Robert Hancock
2007-04-05 19:23 ` Stephen Hemminger [this message]
2007-04-05 20:37 ` Jan Engelhardt
2007-04-05 19:45 ` Stephen Hemminger
2007-04-05 10:40 Jan Engelhardt
2007-04-05 12:13 ` Jiri Kosina
2007-04-05 13:11 ` Mark Hounschell
2007-04-05 14:14 ` Lennart Sorensen
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