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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070405122341.482f5e26@freekitty \
--to=shemminger@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.