netdev - Re: PROBLEM: A set of networking related oopses

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Date:	Sat, 8 Mar 2008 18:57:21 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Tuomas Jormola <tj@...itudo.net>
Cc:	netdev@...r.kernel.org
Subject: Re: PROBLEM: A set of networking related oopses

On Sat, Mar 08, 2008 at 06:13:55PM +0200, Tuomas Jormola wrote:
...
> (18:08:32)(tj@...kti)(~)$ cat /proc/interrupts
>            CPU0       CPU1
...
>  18:     875645     873991   IO-APIC-fasteoi   uhci_hcd:usb1,  
> uhci_hcd:usb6, eth0
>  19:          2          1   IO-APIC-fasteoi   uhci_hcd:usb5, ohci1394
>  20:          0          0   IO-APIC-fasteoi   uhci_hcd:usb2
>  21:          0          0   IO-APIC-fasteoi   uhci_hcd:usb4,  
> ehci_hcd:usb8
>  22:          4          3   IO-APIC-fasteoi   heci
> 217:     498561     498427   PCI-MSI-edge      eth1
> 218:   88587922   88715380   PCI-MSI-edge      ahci
...
> So I would be able to bind eth0 to CPU0 by running
>
> echo 1 > /proc/irq/18/smp_affinity
>
> right? http://www.cs.uwaterloo.ca/~brecht/servers/apic/SMP-affinity.txt 
> says that smp affinity only works for drivers that support IO-APIC. The 
> eth1 card is an old Intel card, and looks like it doesn't support this. I 
> guess I'll replace the card with a newer one.

Should be right. If it's possibile, you can try if moving eth0 to
another slot could give it it's own irq.

I think it should work with both of your cards: eth1 uses newer type
of interrupts - are you sure it's e100?

You can also check if it really fixes the problem by booting with
a kernel parameter: noirqbalance.

Jarek P.
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