Re: [Xen-users] 99% iowait on one core in 8 core processor

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2012-07-12 at 13:04 -0400, Matthias wrote:
> 
> Any other idea how we can make xen utilize the other (v)cpus for it's
> I/O stuff?

Are you sure irqbalanced is running? Some versions had a bug and would
crash on a Xen system (they crash if there is no irq 0 or something like
that). Even if it is running it can take some time for irqbalanced to
realise that things are unbalanced and start moving stuff around.

There are ways in Linux to manually balance IRQs. You have to much
around with /proc/irq/*/smp_affinity*

Really irqbalanced should be doing this for you though. 

Ian.



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