Re: [Xen-devel] Interrupt forwarding

[Jon Smirl <jonsmirl@xxxxxxxxx>]

On Sun, 13 Mar 2005 10:01:42 +0000, Keir Fraser
<Keir.Fraser@xxxxxxxxxxxx> wrote:
> 
> On 12 Mar 2005, at 20:07, Jon Smirl wrote:
> 
> > [jonsmirl@jonsmirl proc]$ cat interrupts
> >            CPU0       CPU1
> >   0:     484259     448188    IO-APIC-edge  timer
> >   8:          0          0    IO-APIC-edge  rtc
> >   9:          0          0   IO-APIC-level  acpi
> >  14:        776        762    IO-APIC-edge  ide0
> >  15:       8040       7726    IO-APIC-edge  ide1
> > 169:      37509          0   IO-APIC-level  libata, uhci_hcd:usb4, eth0
> > 185:          5          0   IO-APIC-level  ehci_hcd:usb1
> > 193:        548        272   IO-APIC-level  uhci_hcd:usb2,
> > uhci_hcd:usb5
> > 201:          0          0   IO-APIC-level  uhci_hcd:usb3
> > 209:          3          0   IO-APIC-level  ohci1394
> > NMI:          0          0
> > LOC:     932357     932306
> > ERR:          0
> > MIS:          0
> 
> Bizarre. Not only routed through an I/O APIC, but the IRQ numbers are
> large enough to probably be MSI vectors. Perhaps the mobo layout has
> legacy PCI slots sharing IRQ lines before reaching MSI logic in the
> chipset? Putting network on the same line as anything else is very
> sucky.  Is this really a server-class board?

It is a Dell Poweredge 400SC server.  I don't like how the net and
SATA drives are on the same IRQ.

I am running the latest linus bk kernel. The IRQ numbering system in
the kernel has been changed. The board is just a standard APIC without
MSI. No PCI Express.

Xen is planned for desktops too, right? Interrupts are shared all of
the time on desktop systems. It is not safe to assume you can get an
exclusive one.


> 
>   -- Keir
> 
> 


-- 
Jon Smirl
jonsmirl@xxxxxxxxx


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