Re: SMP AMD64 (Tyan S2882) problems.

[Andi Kleen <ak@suse.de>]

On Wed, 28 Jan 2004 09:02:13 +0100
Martin Polak <mpolak@gup.jku.at> wrote:

> Andi Kleen wrote:
> > Jan Kasprzak <kas@informatics.muni.cz> writes:
> > 
> > You don't say if you run a 32bit or a 64bit kernel. I will assume 64bit.
> >  
> > 
> >>Is it normal? How can I set up some IRQ balancing (or at least hard-wire
> >>3ware for CPU1 and eth0 for CPU0)?
> > 
> > 
> > Run irqbalanced
> >  
> > 
> Well I posted that thing two weeks ago, occuring on a dual 240 
> K8T-Master from MSI, and yes: running irqbalance works fine, but still I 
> believe that there is some sort of weirdness in initialization code of 
> the kernel (2.6), because on 2.4 Kernels smp-affinity defaults to every 
> cpu and on 2.6 it doesnt.

Opteron doesn't support irq balancing in hardware (at least not with the 
AMD chipset). 2.4/x86-64 kernels didn't have it neither.

Some version of 32bit kernels do automatic irq balancing in the kernel though.

-Andi